| 1 | // License: GPL. For details, see LICENSE file. |
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| 2 | package org.openstreetmap.josm.data.osm; |
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| 3 | |
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| 4 | import java.lang.reflect.Array; |
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| 5 | import java.util.ArrayList; |
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| 6 | import java.util.Arrays; |
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| 7 | import java.util.Collection; |
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| 8 | import java.util.Iterator; |
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| 9 | import java.util.List; |
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| 10 | |
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| 11 | import org.openstreetmap.josm.data.coor.LatLon; |
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| 12 | import org.openstreetmap.josm.data.coor.QuadTiling; |
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| 13 | |
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| 14 | /** |
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| 15 | * Note: bbox of primitives added to QuadBuckets has to stay the same. In case of coordinate change, primitive must |
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| 16 | * be removed and readded. |
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| 17 | * |
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| 18 | * This class is (no longer) thread safe. |
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| 19 | * |
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| 20 | */ |
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| 21 | public class QuadBuckets<T extends OsmPrimitive> implements Collection<T> |
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| 22 | { |
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| 23 | //private static boolean debug = false; |
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| 24 | private static final boolean consistency_testing = false; |
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| 25 | private static final int NW_INDEX = 1; |
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| 26 | private static final int NE_INDEX = 3; |
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| 27 | private static final int SE_INDEX = 2; |
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| 28 | private static final int SW_INDEX = 0; |
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| 29 | |
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| 30 | static void abort(String s) |
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| 31 | { |
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| 32 | throw new AssertionError(s); |
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| 33 | } |
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| 34 | static void out(String s) |
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| 35 | { |
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| 36 | System.out.println(s); |
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| 37 | } |
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| 38 | // periodic output |
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| 39 | long last_out = -1; |
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| 40 | void pout(String s) |
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| 41 | { |
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| 42 | long now = System.currentTimeMillis(); |
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| 43 | if (now - last_out < 300) |
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| 44 | return; |
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| 45 | last_out = now; |
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| 46 | System.out.print(s + "\r"); |
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| 47 | } |
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| 48 | void pout(String s, int i, int total) |
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| 49 | { |
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| 50 | long now = System.currentTimeMillis(); |
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| 51 | if ((now - last_out < 300) && |
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| 52 | ((i+1) < total)) |
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| 53 | return; |
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| 54 | last_out = now; |
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| 55 | // cast to float to keep the output size down |
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| 56 | System.out.print(s + " " + (float)((i+1)*100.0/total) + "% done \r"); |
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| 57 | } |
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| 58 | |
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| 59 | public static final int MAX_OBJECTS_PER_LEVEL = 16; |
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| 60 | class QBLevel |
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| 61 | { |
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| 62 | final int level; |
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| 63 | private final BBox bbox; |
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| 64 | final long quad; |
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| 65 | final QBLevel parent; |
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| 66 | private boolean isLeaf = true; |
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| 67 | |
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| 68 | public List<T> content; |
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| 69 | public QBLevel nw, ne, sw, se; |
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| 70 | |
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| 71 | private QBLevel getChild(int index) { |
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| 72 | switch (index) { |
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| 73 | case NE_INDEX: |
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| 74 | if (ne == null) { |
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| 75 | ne = new QBLevel(this, index); |
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| 76 | } |
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| 77 | return ne; |
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| 78 | case NW_INDEX: |
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| 79 | if (nw == null) { |
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| 80 | nw = new QBLevel(this, index); |
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| 81 | } |
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| 82 | return nw; |
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| 83 | case SE_INDEX: |
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| 84 | if (se == null) { |
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| 85 | se = new QBLevel(this, index); |
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| 86 | } |
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| 87 | return se; |
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| 88 | case SW_INDEX: |
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| 89 | if (sw == null) { |
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| 90 | sw = new QBLevel(this, index); |
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| 91 | } |
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| 92 | return sw; |
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| 93 | default: |
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| 94 | return null; |
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| 95 | } |
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| 96 | } |
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| 97 | |
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| 98 | private QBLevel[] getChildren() { |
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| 99 | // This is ugly and hackish. But, it seems to work, |
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| 100 | // and using an ArrayList here seems to cost us |
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| 101 | // a significant performance penalty -- 50% in my |
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| 102 | // testing. Child access is one of the single |
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| 103 | // hottest code paths in this entire class. |
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| 104 | QBLevel[] result = (QBLevel[]) Array.newInstance(this.getClass(), QuadTiling.TILES_PER_LEVEL); |
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| 105 | result[NW_INDEX] = nw; |
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| 106 | result[NE_INDEX] = ne; |
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| 107 | result[SW_INDEX] = sw; |
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| 108 | result[SE_INDEX] = se; |
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| 109 | return result; |
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| 110 | } |
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| 111 | |
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| 112 | @Override |
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| 113 | public String toString() { |
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| 114 | return super.toString()+ "["+level+"]: " + bbox(); |
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| 115 | } |
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| 116 | /** |
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| 117 | * Constructor for root node |
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| 118 | */ |
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| 119 | public QBLevel() { |
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| 120 | level = 0; |
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| 121 | quad = 0; |
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| 122 | parent = null; |
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| 123 | bbox = new BBox(-180, 90, 180, -90); |
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| 124 | } |
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| 125 | |
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| 126 | public QBLevel(QBLevel parent, int parent_index) { |
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| 127 | this.parent = parent; |
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| 128 | this.level = parent.level + 1; |
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| 129 | int shift = (QuadTiling.NR_LEVELS - level) * 2; |
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| 130 | long mult = 1; |
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| 131 | // Java blows the big one. It seems to wrap when |
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| 132 | // you shift by > 31 |
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| 133 | if (shift >= 30) { |
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| 134 | shift -= 30; |
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| 135 | mult = 1<<30; |
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| 136 | } |
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| 137 | long this_quadpart = mult * (parent_index << shift); |
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| 138 | this.quad = parent.quad | this_quadpart; |
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| 139 | this.bbox = calculateBBox(); // calculateBBox reference quad |
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| 140 | /*if (debug) { |
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| 141 | out("new level["+this.level+"] bbox["+parent_index+"]: " + this.bbox() |
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| 142 | + " coor: " + this.coor() |
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| 143 | + " quadpart: " + Long.toHexString(this_quadpart) |
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| 144 | + " quad: " + Long.toHexString(this.quad)); |
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| 145 | }*/ |
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| 146 | } |
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| 147 | |
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| 148 | private BBox calculateBBox() { |
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| 149 | LatLon bottom_left = this.coor(); |
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| 150 | double lat = bottom_left.lat() + parent.height() / 2; |
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| 151 | double lon = bottom_left.lon() + parent.width() / 2; |
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| 152 | LatLon top_right = new LatLon(lat, lon); |
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| 153 | return new BBox(bottom_left, top_right); |
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| 154 | } |
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| 155 | |
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| 156 | QBLevel findBucket(BBox bbox) { |
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| 157 | if (!hasChildren()) |
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| 158 | return this; |
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| 159 | else { |
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| 160 | int index = get_index(bbox, level); |
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| 161 | if (index == -1) |
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| 162 | return this; |
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| 163 | return getChild(index).findBucket(bbox); |
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| 164 | } |
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| 165 | } |
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| 166 | |
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| 167 | boolean remove_content(T o) |
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| 168 | { |
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| 169 | // If two threads try to remove item at the same time from different buckets of this QBLevel, |
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| 170 | // it might happen that one thread removes bucket but don't remove parent because it still sees |
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| 171 | // another bucket set. Second thread do the same. Due to thread memory caching, it's possible that |
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| 172 | // changes made by threads will show up in children array too late, leading to QBLevel with all children |
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| 173 | // set to null |
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| 174 | if (content == null) |
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| 175 | return false; |
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| 176 | boolean ret = this.content.remove(o); |
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| 177 | if (this.content.size() == 0) { |
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| 178 | this.content = null; |
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| 179 | } |
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| 180 | if (this.canRemove()) { |
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| 181 | this.remove_from_parent(); |
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| 182 | } |
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| 183 | return ret; |
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| 184 | } |
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| 185 | // Get the correct index for the given primitive |
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| 186 | // at the given level. If the primitive can not |
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| 187 | // fit into a single quad at this level, return -1 |
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| 188 | int get_index(BBox bbox, int level) { |
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| 189 | int index = -1; |
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| 190 | for (LatLon c : bbox.points()) { |
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| 191 | /*if (debug) { |
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| 192 | out("getting index for point: " + c); |
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| 193 | }*/ |
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| 194 | if (index == -1) { |
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| 195 | index = QuadTiling.index(c, level); |
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| 196 | /*if (debug) { |
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| 197 | out("set initial index to: " + index); |
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| 198 | }*/ |
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| 199 | continue; |
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| 200 | } |
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| 201 | int another_index = QuadTiling.index(c, level); |
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| 202 | /*if (debug) { |
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| 203 | out("other point index: " + another_index); |
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| 204 | }*/ |
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| 205 | if (another_index != index) |
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| 206 | return -1; |
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| 207 | } |
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| 208 | return index; |
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| 209 | } |
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| 210 | /* |
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| 211 | * There is a race between this and qb.nextContentNode(). |
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| 212 | * If nextContentNode() runs into this bucket, it may |
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| 213 | * attempt to null out 'children' because it thinks this |
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| 214 | * is a dead end. |
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| 215 | */ |
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| 216 | void __split() { |
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| 217 | /*if (debug) { |
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| 218 | out("splitting "+this.bbox()+" level "+level+" with " |
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| 219 | + content.size() + " entries (my dimensions: " |
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| 220 | + this.bbox().width()+", "+this.bbox().height()+")"); |
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| 221 | }*/ |
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| 222 | List<T> tmpcontent = content; |
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| 223 | content = null; |
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| 224 | |
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| 225 | for (T o: tmpcontent) { |
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| 226 | int index = get_index(o.getBBox(), level); |
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| 227 | if (index == -1) { |
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| 228 | __add_content(o); |
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| 229 | } else { |
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| 230 | getChild(index).doAdd(o); |
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| 231 | } |
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| 232 | } |
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| 233 | isLeaf = false; // It's not enough to check children because all items could end up in this level (index == -1) |
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| 234 | } |
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| 235 | |
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| 236 | boolean __add_content(T o) |
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| 237 | { |
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| 238 | boolean ret = false; |
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| 239 | // The split_lock will keep two concurrent |
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| 240 | // calls from overwriting content |
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| 241 | if (content == null) { |
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| 242 | content = new ArrayList<T>(); |
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| 243 | } |
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| 244 | ret = content.add(o); |
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| 245 | /*if (debug && !this.isLeaf()) { |
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| 246 | pout("added "+o.getClass().getName()+" to non-leaf with size: " + content.size()); |
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| 247 | }*/ |
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| 248 | return ret; |
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| 249 | } |
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| 250 | boolean matches(T o, BBox search_bbox) |
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| 251 | { |
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| 252 | // This can be optimized when o is a node |
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| 253 | //return search_bbox.bounds(coor)); |
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| 254 | return o.getBBox().intersects(search_bbox); |
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| 255 | } |
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| 256 | private void search_contents(BBox search_bbox, List<T> result) |
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| 257 | { |
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| 258 | /*if (debug) { |
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| 259 | out("searching contents (size: " + content == null?"<null>":content.size() + ") for " + search_bbox); |
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| 260 | }*/ |
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| 261 | /* |
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| 262 | * It is possible that this was created in a split |
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| 263 | * but never got any content populated. |
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| 264 | */ |
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| 265 | if (content == null) |
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| 266 | return; |
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| 267 | |
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| 268 | for (T o : content) { |
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| 269 | if (matches(o, search_bbox)) { |
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| 270 | result.add(o); |
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| 271 | } |
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| 272 | } |
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| 273 | /*if (debug) { |
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| 274 | out("done searching quad " + Long.toHexString(this.quad)); |
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| 275 | }*/ |
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| 276 | } |
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| 277 | /* |
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| 278 | * This is stupid. I tried to have a QBLeaf and QBBranch |
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| 279 | * class decending from a QBLevel. It's more than twice |
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| 280 | * as slow. So, this throws OO out the window, but it |
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| 281 | * is fast. Runtime type determination must be slow. |
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| 282 | */ |
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| 283 | boolean isLeaf() { |
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| 284 | return isLeaf; |
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| 285 | } |
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| 286 | boolean hasChildren() { |
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| 287 | return nw != null || ne != null || sw != null || se != null; |
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| 288 | } |
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| 289 | |
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| 290 | QBLevel next_sibling() |
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| 291 | { |
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| 292 | boolean found_me = false; |
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| 293 | if (parent == null) |
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| 294 | return null; |
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| 295 | int __nr = 0; |
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| 296 | for (QBLevel sibling : parent.getChildren()) { |
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| 297 | __nr++; |
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| 298 | int nr = __nr-1; |
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| 299 | if (sibling == null) { |
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| 300 | /*if (debug) { |
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| 301 | out("[" + this.level + "] null child nr: " + nr); |
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| 302 | }*/ |
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| 303 | continue; |
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| 304 | } |
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| 305 | // We're looking for the *next* child |
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| 306 | // after us. |
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| 307 | if (sibling == this) { |
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| 308 | /*if (debug) { |
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| 309 | out("[" + this.level + "] I was child nr: " + nr); |
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| 310 | }*/ |
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| 311 | found_me = true; |
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| 312 | continue; |
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| 313 | } |
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| 314 | if (found_me) |
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| 315 | /*if (debug) { |
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| 316 | out("[" + this.level + "] next sibling was child nr: " + nr); |
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| 317 | }*/ |
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| 318 | return sibling; |
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| 319 | } |
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| 320 | return null; |
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| 321 | } |
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| 322 | boolean hasContent() |
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| 323 | { |
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| 324 | return content != null; |
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| 325 | } |
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| 326 | QBLevel nextSibling() |
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| 327 | { |
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| 328 | QBLevel next = this; |
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| 329 | QBLevel sibling = next.next_sibling(); |
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| 330 | // Walk back up the tree to find the |
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| 331 | // next sibling node. It may be either |
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| 332 | // a leaf or branch. |
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| 333 | while (sibling == null) { |
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| 334 | /*if (debug) { |
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| 335 | out("no siblings at level["+next.level+"], moving to parent"); |
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| 336 | }*/ |
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| 337 | next = next.parent; |
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| 338 | if (next == null) { |
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| 339 | break; |
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| 340 | } |
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| 341 | sibling = next.next_sibling(); |
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| 342 | } |
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| 343 | next = sibling; |
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| 344 | return next; |
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| 345 | } |
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| 346 | QBLevel firstChild() |
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| 347 | { |
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| 348 | QBLevel ret = null; |
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| 349 | for (QBLevel child : getChildren()) { |
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| 350 | if (child == null) { |
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| 351 | continue; |
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| 352 | } |
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| 353 | ret = child; |
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| 354 | break; |
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| 355 | } |
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| 356 | return ret; |
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| 357 | } |
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| 358 | QBLevel nextNode() |
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| 359 | { |
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| 360 | if (!this.hasChildren()) |
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| 361 | return this.nextSibling(); |
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| 362 | return this.firstChild(); |
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| 363 | } |
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| 364 | QBLevel nextContentNode() |
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| 365 | { |
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| 366 | QBLevel next = this.nextNode(); |
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| 367 | if (next == null) |
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| 368 | return next; |
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| 369 | if (next.hasContent()) |
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| 370 | return next; |
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| 371 | return next.nextContentNode(); |
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| 372 | } |
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| 373 | |
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| 374 | void doAdd(T o) { |
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| 375 | if (consistency_testing) { |
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| 376 | if (!matches(o, this.bbox())) { |
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| 377 | /*out("-----------------------------"); |
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| 378 | debug = true;*/ |
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| 379 | get_index(o.getBBox(), level); |
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| 380 | get_index(o.getBBox(), level-1); |
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| 381 | int nr = 0; |
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| 382 | /*for (QBLevel sibling : parent.getChildren()) { |
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| 383 | out("sibling["+ (nr++) +"]: " + sibling.bbox() + " this: " + (this==sibling)); |
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| 384 | }*/ |
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| 385 | abort("\nobject " + o + " does not belong in node at level: " + level + " bbox: " + this.bbox()); |
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| 386 | } |
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| 387 | } |
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| 388 | __add_content(o); |
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| 389 | if (isLeaf() && content.size() > MAX_OBJECTS_PER_LEVEL && level < QuadTiling.NR_LEVELS) { |
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| 390 | __split(); |
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| 391 | } |
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| 392 | } |
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| 393 | |
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| 394 | void add(T o) { |
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| 395 | findBucket(o.getBBox()).doAdd(o); |
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| 396 | } |
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| 397 | |
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| 398 | private void search(BBox search_bbox, List<T> result) |
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| 399 | { |
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| 400 | /*if (debug) { |
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| 401 | System.out.print("[" + level + "] qb bbox: " + this.bbox() + " "); |
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| 402 | }*/ |
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| 403 | if (!this.bbox().intersects(search_bbox)) |
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| 404 | /*if (debug) { |
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| 405 | out("miss " + Long.toHexString(this.quad)); |
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| 406 | //QuadTiling.tile2xy(this.quad); |
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| 407 | }*/ |
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| 408 | return; |
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| 409 | else if (bbox().bounds(search_bbox)) { |
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| 410 | search_cache = this; |
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| 411 | } |
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| 412 | |
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| 413 | if (this.hasContent()) { |
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| 414 | search_contents(search_bbox, result); |
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| 415 | } |
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| 416 | |
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| 417 | /*if (debug) { |
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| 418 | out("hit " + this.quads()); |
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| 419 | out("[" + level + "] not leaf, moving down"); |
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| 420 | }*/ |
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| 421 | |
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| 422 | //TODO Coincidence vector should be calculated here and only buckets that match search_bbox should be checked |
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| 423 | |
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| 424 | if (nw != null) { |
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| 425 | nw.search(search_bbox, result); |
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| 426 | } |
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| 427 | if (ne != null) { |
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| 428 | ne.search(search_bbox, result); |
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| 429 | } |
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| 430 | if (se != null) { |
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| 431 | se.search(search_bbox, result); |
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| 432 | } |
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| 433 | if (sw != null) { |
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| 434 | sw.search(search_bbox, result); |
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| 435 | } |
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| 436 | } |
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| 437 | public String quads() |
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| 438 | { |
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| 439 | return Long.toHexString(quad); |
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| 440 | } |
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| 441 | int index_of(QBLevel find_this) |
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| 442 | { |
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| 443 | QBLevel[] children = getChildren(); |
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| 444 | for (int i = 0; i < QuadTiling.TILES_PER_LEVEL; i++) { |
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| 445 | if (children[i] == find_this) |
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| 446 | return i; |
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| 447 | } |
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| 448 | return -1; |
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| 449 | } |
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| 450 | double width() { |
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| 451 | return bbox.width(); |
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| 452 | } |
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| 453 | |
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| 454 | double height() { |
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| 455 | return bbox.height(); |
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| 456 | } |
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| 457 | |
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| 458 | public BBox bbox() { |
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| 459 | return bbox; |
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| 460 | } |
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| 461 | /* |
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| 462 | * This gives the coordinate of the bottom-left |
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| 463 | * corner of the box |
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| 464 | */ |
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| 465 | LatLon coor() |
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| 466 | { |
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| 467 | return QuadTiling.tile2LatLon(this.quad); |
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| 468 | } |
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| 469 | void remove_from_parent() |
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| 470 | { |
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| 471 | if (parent == null) |
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| 472 | return; |
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| 473 | |
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| 474 | if (!canRemove()) { |
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| 475 | abort("attempt to remove non-empty child: " + this.content + " " + Arrays.toString(this.getChildren())); |
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| 476 | } |
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| 477 | |
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| 478 | if (parent.nw == this) { |
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| 479 | parent.nw = null; |
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| 480 | } else if (parent.ne == this) { |
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| 481 | parent.ne = null; |
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| 482 | } else if (parent.sw == this) { |
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| 483 | parent.sw = null; |
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| 484 | } else if (parent.se == this) { |
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| 485 | parent.se = null; |
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| 486 | } |
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| 487 | |
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| 488 | if (parent.canRemove()) { |
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| 489 | parent.remove_from_parent(); |
|---|
| 490 | } |
|---|
| 491 | } |
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| 492 | boolean canRemove() |
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| 493 | { |
|---|
| 494 | if (content != null && content.size() > 0) |
|---|
| 495 | return false; |
|---|
| 496 | if (this.hasChildren()) |
|---|
| 497 | return false; |
|---|
| 498 | return true; |
|---|
| 499 | } |
|---|
| 500 | } |
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| 501 | |
|---|
| 502 | private QBLevel root; |
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| 503 | private QBLevel search_cache; |
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| 504 | private int size; |
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| 505 | |
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| 506 | public QuadBuckets() |
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| 507 | { |
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| 508 | clear(); |
|---|
| 509 | } |
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| 510 | public void clear() { |
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| 511 | root = new QBLevel(); |
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| 512 | search_cache = null; |
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| 513 | size = 0; |
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| 514 | /*if (debug) { |
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| 515 | out("QuadBuckets() cleared: " + this); |
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| 516 | out("root: " + root + " level: " + root.level + " bbox: " + root.bbox()); |
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| 517 | }*/ |
|---|
| 518 | } |
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| 519 | public boolean add(T n) { |
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| 520 | root.add(n); |
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| 521 | size++; |
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| 522 | return true; |
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| 523 | } |
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| 524 | |
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| 525 | public boolean retainAll(Collection<?> objects) |
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| 526 | { |
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| 527 | for (T o : this) { |
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| 528 | if (objects.contains(o)) { |
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| 529 | continue; |
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| 530 | } |
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| 531 | if (!this.remove(o)) |
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| 532 | return false; |
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| 533 | } |
|---|
| 534 | return true; |
|---|
| 535 | } |
|---|
| 536 | public boolean removeAll(Collection<?> objects) |
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| 537 | { |
|---|
| 538 | boolean changed = false; |
|---|
| 539 | for (Object o : objects) { |
|---|
| 540 | changed = changed | remove(o); |
|---|
| 541 | } |
|---|
| 542 | return changed; |
|---|
| 543 | } |
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| 544 | public boolean addAll(Collection<? extends T> objects) |
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| 545 | { |
|---|
| 546 | boolean changed = false; |
|---|
| 547 | for (T o : objects) { |
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| 548 | changed = changed | this.add(o); |
|---|
| 549 | } |
|---|
| 550 | return changed; |
|---|
| 551 | } |
|---|
| 552 | public boolean containsAll(Collection<?> objects) |
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| 553 | { |
|---|
| 554 | for (Object o : objects) { |
|---|
| 555 | if (!this.contains(o)) |
|---|
| 556 | return false; |
|---|
| 557 | } |
|---|
| 558 | return true; |
|---|
| 559 | } |
|---|
| 560 | public boolean remove(Object o) { |
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| 561 | @SuppressWarnings("unchecked") T t = (T) o; |
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| 562 | search_cache = null; // Search cache might point to one of removed buckets |
|---|
| 563 | QBLevel bucket = root.findBucket(t.getBBox()); |
|---|
| 564 | if (bucket.remove_content(t)) { |
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| 565 | size--; |
|---|
| 566 | return true; |
|---|
| 567 | } else |
|---|
| 568 | return false; |
|---|
| 569 | } |
|---|
| 570 | public boolean contains(Object o) { |
|---|
| 571 | @SuppressWarnings("unchecked") T t = (T) o; |
|---|
| 572 | QBLevel bucket = root.findBucket(t.getBBox()); |
|---|
| 573 | return bucket != null && bucket.content != null && bucket.content.contains(t); |
|---|
| 574 | } |
|---|
| 575 | |
|---|
| 576 | public ArrayList<T> toArrayList() |
|---|
| 577 | { |
|---|
| 578 | ArrayList<T> a = new ArrayList<T>(); |
|---|
| 579 | for (T n : this) { |
|---|
| 580 | a.add(n); |
|---|
| 581 | } |
|---|
| 582 | /*if (debug) { |
|---|
| 583 | out("returning array list with size: " + a.size()); |
|---|
| 584 | }*/ |
|---|
| 585 | return a; |
|---|
| 586 | } |
|---|
| 587 | public Object[] toArray() |
|---|
| 588 | { |
|---|
| 589 | return this.toArrayList().toArray(); |
|---|
| 590 | } |
|---|
| 591 | public <A> A[] toArray(A[] template) |
|---|
| 592 | { |
|---|
| 593 | return this.toArrayList().toArray(template); |
|---|
| 594 | } |
|---|
| 595 | class QuadBucketIterator implements Iterator<T> |
|---|
| 596 | { |
|---|
| 597 | QBLevel current_node; |
|---|
| 598 | int content_index; |
|---|
| 599 | int iterated_over; |
|---|
| 600 | QBLevel next_content_node(QBLevel q) |
|---|
| 601 | { |
|---|
| 602 | if (q == null) |
|---|
| 603 | return null; |
|---|
| 604 | QBLevel orig = q; |
|---|
| 605 | QBLevel next; |
|---|
| 606 | next = q.nextContentNode(); |
|---|
| 607 | //if (consistency_testing && (orig == next)) |
|---|
| 608 | if (orig == next) { |
|---|
| 609 | abort("got same leaf back leaf: " + q.isLeaf()); |
|---|
| 610 | } |
|---|
| 611 | return next; |
|---|
| 612 | } |
|---|
| 613 | public QuadBucketIterator(QuadBuckets<T> qb) |
|---|
| 614 | { |
|---|
| 615 | /*if (debug) { |
|---|
| 616 | out(this + " is a new iterator qb: " + qb + " size: " + qb.size()); |
|---|
| 617 | }*/ |
|---|
| 618 | if (!qb.root.hasChildren() || qb.root.hasContent()) { |
|---|
| 619 | current_node = qb.root; |
|---|
| 620 | } else { |
|---|
| 621 | current_node = next_content_node(qb.root); |
|---|
| 622 | } |
|---|
| 623 | /*if (debug) { |
|---|
| 624 | out("\titerator first leaf: " + current_node); |
|---|
| 625 | }*/ |
|---|
| 626 | iterated_over = 0; |
|---|
| 627 | } |
|---|
| 628 | public boolean hasNext() |
|---|
| 629 | { |
|---|
| 630 | if (this.peek() == null) |
|---|
| 631 | /*if (debug) { |
|---|
| 632 | out(this + " no hasNext(), but iterated over so far: " + iterated_over); |
|---|
| 633 | }*/ |
|---|
| 634 | return false; |
|---|
| 635 | return true; |
|---|
| 636 | } |
|---|
| 637 | T peek() |
|---|
| 638 | { |
|---|
| 639 | if (current_node == null) |
|---|
| 640 | /*if (debug) { |
|---|
| 641 | out("null current leaf, nowhere to go"); |
|---|
| 642 | }*/ |
|---|
| 643 | return null; |
|---|
| 644 | while((current_node.content == null) || |
|---|
| 645 | (content_index >= current_node.content.size())) { |
|---|
| 646 | /*if (debug) { |
|---|
| 647 | out("moving to next leaf"); |
|---|
| 648 | }*/ |
|---|
| 649 | content_index = 0; |
|---|
| 650 | current_node = next_content_node(current_node); |
|---|
| 651 | if (current_node == null) { |
|---|
| 652 | break; |
|---|
| 653 | } |
|---|
| 654 | } |
|---|
| 655 | if (current_node == null || current_node.content == null) |
|---|
| 656 | /*if (debug) { |
|---|
| 657 | out("late nowhere to go " + current_node); |
|---|
| 658 | }*/ |
|---|
| 659 | return null; |
|---|
| 660 | return current_node.content.get(content_index); |
|---|
| 661 | } |
|---|
| 662 | public T next() |
|---|
| 663 | { |
|---|
| 664 | T ret = peek(); |
|---|
| 665 | content_index++; |
|---|
| 666 | /*if (debug) { |
|---|
| 667 | out("iteration["+iterated_over+"] " + content_index + " leaf: " + current_node); |
|---|
| 668 | }*/ |
|---|
| 669 | iterated_over++; |
|---|
| 670 | if (ret == null) { |
|---|
| 671 | /*if (debug) { |
|---|
| 672 | out(this + " no next node, but iterated over so far: " + iterated_over); |
|---|
| 673 | }*/ |
|---|
| 674 | } |
|---|
| 675 | return ret; |
|---|
| 676 | } |
|---|
| 677 | public void remove() |
|---|
| 678 | { |
|---|
| 679 | // two uses |
|---|
| 680 | // 1. Back up to the thing we just returned |
|---|
| 681 | // 2. move the index back since we removed |
|---|
| 682 | // an element |
|---|
| 683 | content_index--; |
|---|
| 684 | T object = peek(); |
|---|
| 685 | current_node.remove_content(object); |
|---|
| 686 | } |
|---|
| 687 | } |
|---|
| 688 | public Iterator<T> iterator() |
|---|
| 689 | { |
|---|
| 690 | return new QuadBucketIterator(this); |
|---|
| 691 | } |
|---|
| 692 | public int size() { |
|---|
| 693 | return size; |
|---|
| 694 | } |
|---|
| 695 | |
|---|
| 696 | public boolean isEmpty() |
|---|
| 697 | { |
|---|
| 698 | if (this.size() == 0) |
|---|
| 699 | return true; |
|---|
| 700 | return false; |
|---|
| 701 | } |
|---|
| 702 | public List<T> search(BBox search_bbox) { |
|---|
| 703 | /*if (debug) { |
|---|
| 704 | out("qb root search at " + search_bbox); |
|---|
| 705 | out("root bbox: " + root.bbox()); |
|---|
| 706 | }*/ |
|---|
| 707 | List<T> ret = new ArrayList<T>(); |
|---|
| 708 | // Doing this cuts down search cost on a real-life data |
|---|
| 709 | // set by about 25% |
|---|
| 710 | boolean cache_searches = true; |
|---|
| 711 | if (cache_searches) { |
|---|
| 712 | if (search_cache == null) { |
|---|
| 713 | search_cache = root; |
|---|
| 714 | } |
|---|
| 715 | // Walk back up the tree when the last |
|---|
| 716 | // search spot can not cover the current |
|---|
| 717 | // search |
|---|
| 718 | while (search_cache != null && !search_cache.bbox().bounds(search_bbox)) { |
|---|
| 719 | /*if (debug) { |
|---|
| 720 | out("bbox: " + search_bbox); |
|---|
| 721 | out("search_cache: " + search_cache + " level: " + search_cache.level); |
|---|
| 722 | out("search_cache.bbox(): " + search_cache.bbox()); |
|---|
| 723 | }*/ |
|---|
| 724 | search_cache = search_cache.parent; |
|---|
| 725 | /*if (debug) { |
|---|
| 726 | out("new search_cache: " + search_cache); |
|---|
| 727 | }*/ |
|---|
| 728 | } |
|---|
| 729 | |
|---|
| 730 | if (search_cache == null) { |
|---|
| 731 | search_cache = root; |
|---|
| 732 | out("bbox: " + search_bbox + " is out of the world"); |
|---|
| 733 | } |
|---|
| 734 | } else { |
|---|
| 735 | search_cache = root; |
|---|
| 736 | } |
|---|
| 737 | |
|---|
| 738 | // Save parent because search_cache might change during search call |
|---|
| 739 | QBLevel tmp = search_cache.parent; |
|---|
| 740 | |
|---|
| 741 | search_cache.search(search_bbox, ret); |
|---|
| 742 | |
|---|
| 743 | // A way that spans this bucket may be stored in one |
|---|
| 744 | // of the nodes which is a parent of the search cache |
|---|
| 745 | while (tmp != null) { |
|---|
| 746 | tmp.search_contents(search_bbox, ret); |
|---|
| 747 | tmp = tmp.parent; |
|---|
| 748 | } |
|---|
| 749 | /*if (debug) { |
|---|
| 750 | out("search of QuadBuckets for " + search_bbox + " ret len: " + ret.size()); |
|---|
| 751 | }*/ |
|---|
| 752 | return ret; |
|---|
| 753 | } |
|---|
| 754 | |
|---|
| 755 | public void printTree() { |
|---|
| 756 | printTreeRecursive(root, 0); |
|---|
| 757 | } |
|---|
| 758 | |
|---|
| 759 | private void printTreeRecursive(QBLevel level, int indent) { |
|---|
| 760 | if (level == null) { |
|---|
| 761 | printIndented(indent, "<empty child>"); |
|---|
| 762 | return; |
|---|
| 763 | } |
|---|
| 764 | printIndented(indent, level); |
|---|
| 765 | if (level.hasContent()) { |
|---|
| 766 | for (T o:level.content) { |
|---|
| 767 | printIndented(indent, o); |
|---|
| 768 | } |
|---|
| 769 | } |
|---|
| 770 | for (QBLevel child:level.getChildren()) { |
|---|
| 771 | printTreeRecursive(child, indent + 2); |
|---|
| 772 | } |
|---|
| 773 | } |
|---|
| 774 | |
|---|
| 775 | private void printIndented(int indent, Object msg) { |
|---|
| 776 | for (int i=0; i<indent; i++) { |
|---|
| 777 | System.out.print(' '); |
|---|
| 778 | } |
|---|
| 779 | System.out.println(msg); |
|---|
| 780 | } |
|---|
| 781 | } |
|---|