[3504] | 1 | // License: GPL. For details, see LICENSE file.
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| 2 | package org.openstreetmap.josm.tools;
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| 3 |
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[3859] | 4 | import java.awt.Color;
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[3848] | 5 | import java.util.Collection;
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| 6 |
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[3504] | 7 | public class Utils {
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| 8 |
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[3836] | 9 | public static <T> boolean exists(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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| 10 | for (T item : collection) {
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| 11 | if (predicate.evaluate(item))
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[3504] | 12 | return true;
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| 13 | }
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| 14 | return false;
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| 15 | }
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[3674] | 16 |
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[3836] | 17 | public static <T> boolean exists(Iterable collection, Class<? extends T> klass) {
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| 18 | for (Object item : collection) {
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| 19 | if (klass.isInstance(item))
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| 20 | return true;
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| 21 | }
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| 22 | return false;
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| 23 | }
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| 24 |
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| 25 | public static <T> T find(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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| 26 | for (T item : collection) {
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| 27 | if (predicate.evaluate(item))
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| 28 | return item;
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| 29 | }
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| 30 | return null;
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| 31 | }
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| 32 |
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| 33 | public static <T> T find(Iterable collection, Class<? extends T> klass) {
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| 34 | for (Object item : collection) {
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| 35 | if (klass.isInstance(item)) {
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| 36 | @SuppressWarnings("unchecked") T res = (T) item;
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| 37 | return res;
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| 38 | }
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| 39 | }
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| 40 | return null;
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| 41 | }
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| 42 |
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[3869] | 43 | public static <T> int indexOf(Iterable<? extends T> collection, Predicate<? super T> predicate) {
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| 44 | int i = 0;
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| 45 | for (T item : collection) {
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| 46 | if (predicate.evaluate(item))
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| 47 | return i;
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| 48 | i++;
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| 49 | }
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| 50 | return -1;
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| 51 | }
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| 52 |
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[3674] | 53 | /**
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| 54 | * Get minimum of 3 values
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| 55 | */
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| 56 | public static int min(int a, int b, int c) {
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| 57 | if (b < c) {
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| 58 | if (a < b)
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| 59 | return a;
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| 60 | return b;
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| 61 | } else {
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| 62 | if (a < c) {
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| 63 | return a;
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| 64 | }
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| 65 | return c;
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| 66 | }
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| 67 | }
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[3711] | 68 |
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[3836] | 69 | public static int max(int a, int b, int c, int d) {
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| 70 | return Math.max(Math.max(a, b), Math.max(c, d));
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| 71 | }
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| 72 |
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[3711] | 73 | /**
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[3796] | 74 | * for convenience: test whether 2 objects are either both null or a.equals(b)
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| 75 | */
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| 76 | public static <T> boolean equal(T a, T b) {
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[3836] | 77 | if (a == b)
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[3796] | 78 | return true;
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| 79 | return (a != null && a.equals(b));
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| 80 | }
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| 81 |
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| 82 | /**
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[3711] | 83 | * return the modulus in the range [0, n)
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| 84 | */
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| 85 | public static int mod(int a, int n) {
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| 86 | if (n <= 0)
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| 87 | throw new IllegalArgumentException();
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| 88 | int res = a % n;
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| 89 | if (res < 0) {
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| 90 | res += n;
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| 91 | }
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| 92 | return res;
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| 93 | }
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| 94 |
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[3848] | 95 | /**
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| 96 | * Joins a list of strings (or objects that can be converted to string via
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| 97 | * Object.toString()) into a single string with fields separated by sep.
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| 98 | * @param sep the separator
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| 99 | * @param values collection of objects, null is converted to the
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| 100 | * empty string
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| 101 | * @return null if values is null. The joined string otherwise.
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| 102 | */
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| 103 | public static String join(String sep, Collection<?> values) {
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| 104 | if (sep == null)
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| 105 | throw new IllegalArgumentException();
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| 106 | if (values == null)
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| 107 | return null;
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| 108 | if (values.isEmpty())
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| 109 | return "";
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| 110 | StringBuilder s = null;
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| 111 | for (Object a : values) {
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| 112 | if (a == null) {
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| 113 | a = "";
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| 114 | }
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| 115 | if(s != null) {
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| 116 | s.append(sep).append(a.toString());
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| 117 | } else {
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| 118 | s = new StringBuilder(a.toString());
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| 119 | }
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| 120 | }
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| 121 | return s.toString();
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| 122 | }
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[3859] | 123 |
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| 124 | /**
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| 125 | * convert Color to String
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| 126 | * (Color.toString() omits alpha value)
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| 127 | */
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| 128 | public static String toString(Color c) {
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| 129 | if (c == null)
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| 130 | return "null";
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| 131 | if (c.getAlpha() == 255)
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| 132 | return String.format("#%06x", c.getRGB() & 0x00ffffff);
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| 133 | else
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| 134 | return String.format("#%06x(alpha=%d)", c.getRGB() & 0x00ffffff, c.getAlpha());
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| 135 | }
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[3865] | 136 |
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| 137 | /**
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| 138 | * convert float range 0 <= x <= 1 to integer range 0..255
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| 139 | * when dealing with colors and color alpha value
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[3879] | 140 | * @return null if val is null, the corresponding int if val is in the
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| 141 | * range 0...1. If val is outside that range, return 255
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[3865] | 142 | */
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| 143 | public static Integer color_float2int(Float val) {
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| 144 | if (val == null)
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| 145 | return null;
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| 146 | if (val < 0 || val > 1)
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| 147 | return 255;
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| 148 | return (int) (255f * val + 0.5f);
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| 149 | }
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| 150 |
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| 151 | /**
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| 152 | * convert back
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| 153 | */
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| 154 | public static Float color_int2float(Integer val) {
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| 155 | if (val == null)
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| 156 | return null;
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| 157 | if (val < 0 || val > 255)
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| 158 | return 1f;
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| 159 | return ((float) val) / 255f;
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| 160 | }
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| 161 |
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[3504] | 162 | }
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