| 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.util.Collection;
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| 5 |
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| 6 | /**
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| 7 | *
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| 8 | * @author Petr_Dlouhý
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| 9 | */
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| 10 | public class FilterWorker {
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| 11 | /**
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| 12 | * Apply the filters to the primitives of the data set.
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| 13 | *
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| 14 | * There are certain rules to ensure that a way is not displayed "naked"
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| 15 | * without its nodes (1) and on the other hand to avoid hiding a way but
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| 16 | * leaving its nodes visible as a cloud of points (2).
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| 17 | *
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| 18 | * In normal (non-inverted) mode only problem (2) is relevant.
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| 19 | * Untagged child nodes of filtered ways that are not used by other
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| 20 | * unfiltered ways are filtered as well.
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| 21 | *
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| 22 | * If a filter applies explicitly to a node, (2) is ignored and it
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| 23 | * is filtered in any case.
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| 24 | *
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| 25 | * In inverted mode usually only problem (1) is relevant.
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| 26 | * If the inverted filter applies explicitly to a node, this no longer
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| 27 | * means it is filtered in any case:
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| 28 | * E.g. the filter [searchtext="highway=footway", inverted=true] displays
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| 29 | * the footways only. But that does not mean, the nodes of the footway
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| 30 | * (which do not have the highway tag) should be filtered as well.
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| 31 | *
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| 32 | * So first the Filter is applied for ways and relations. Then to nodes
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| 33 | * (but hides them only if they are not used by any unfiltered way).
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| 34 | */
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| 35 | public static boolean executeFilters(Collection<OsmPrimitive> all, FilterMatcher filterMatcher) {
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| 36 |
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| 37 | boolean changed = false;
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| 38 |
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| 39 | // First relation and ways
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| 40 | for (OsmPrimitive primitive: all) {
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| 41 | if (!(primitive instanceof Node)) {
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| 42 | if (filterMatcher.isHidden(primitive)) {
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| 43 | changed = changed | primitive.setDisabledState(true);
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| 44 | } else if (filterMatcher.isDisabled(primitive)) {
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| 45 | changed = changed | primitive.setDisabledState(false);
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| 46 | } else {
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| 47 | changed = changed | primitive.unsetDisabledState();
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| 48 | }
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| 49 | }
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| 50 | }
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| 51 |
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| 52 | // Then nodes (because they state may depend on parent ways)
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| 53 | for (OsmPrimitive primitive: all) {
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| 54 | if (primitive instanceof Node) {
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| 55 | if (filterMatcher.isHidden(primitive)) {
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| 56 | changed = changed | primitive.setDisabledState(true);
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| 57 | } else if (filterMatcher.isDisabled(primitive)) {
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| 58 | changed = changed | primitive.setDisabledState(false);
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| 59 | } else {
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| 60 | changed = changed | primitive.unsetDisabledState();
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| 61 | }
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| 62 | }
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| 63 | }
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| 64 |
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| 65 | return changed;
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| 66 | }
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| 67 |
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| 68 | public static boolean executeFilters(OsmPrimitive primitive, FilterMatcher filterMatcher) {
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| 69 | boolean changed = false;
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| 70 | if (filterMatcher.isHidden(primitive)) {
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| 71 | changed = changed | primitive.setDisabledState(true);
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| 72 | } else if (filterMatcher.isDisabled(primitive)) {
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| 73 | changed = changed | primitive.setDisabledState(false);
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| 74 | } else {
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| 75 | changed = changed | primitive.unsetDisabledState();
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| 76 | }
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| 77 | return changed;
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| 78 | }
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| 79 |
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| 80 | public static void clearFilterFlags(Collection<OsmPrimitive> prims) {
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| 81 | for (OsmPrimitive osm : prims) {
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| 82 | osm.unsetDisabledState();
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| 83 | }
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| 84 | }
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| 85 | }
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