[8378] | 1 | // License: GPL. For details, see LICENSE file.
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[6547] | 2 | package org.openstreetmap.josm.tools;
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| 3 |
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[6652] | 4 | import java.util.Collection;
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[7083] | 5 | import java.util.Objects;
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[6547] | 6 | import java.util.regex.Pattern;
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| 7 |
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[7083] | 8 | import org.openstreetmap.josm.data.osm.OsmPrimitive;
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| 9 |
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[6547] | 10 | /**
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| 11 | * Utility class for creating {@link Predicate}s.
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| 12 | */
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| 13 | public final class Predicates {
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| 14 |
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| 15 | private Predicates() {
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| 16 | }
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| 17 |
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| 18 | /**
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[6592] | 19 | * Returns the negation of {@code predicate}.
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[8928] | 20 | * @param predicate the predicate to negate
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| 21 | * @return the negation of {@code predicate}
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[6592] | 22 | */
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| 23 | public static <T> Predicate<T> not(final Predicate<T> predicate) {
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| 24 | return new Predicate<T>() {
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| 25 | @Override
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| 26 | public boolean evaluate(T obj) {
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| 27 | return !predicate.evaluate(obj);
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| 28 | }
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| 29 | };
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| 30 | }
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| 31 |
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| 32 | /**
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[7170] | 33 | * Returns a {@link Predicate} executing {@link Objects#equals}.
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[8928] | 34 | * @param ref the reference object
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| 35 | * @return a {@link Predicate} executing {@link Objects#equals}
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[6592] | 36 | */
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| 37 | public static <T> Predicate<T> equalTo(final T ref) {
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| 38 | return new Predicate<T>() {
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| 39 | @Override
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| 40 | public boolean evaluate(T obj) {
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[7083] | 41 | return Objects.equals(obj, ref);
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[6592] | 42 | }
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| 43 | };
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| 44 | }
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| 45 |
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| 46 | /**
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[6547] | 47 | * Returns a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#matches}.
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[8928] | 48 | * @param pattern the pattern
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| 49 | * @return a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#matches}
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[6547] | 50 | */
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| 51 | public static Predicate<String> stringMatchesPattern(final Pattern pattern) {
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| 52 | return new Predicate<String>() {
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| 53 | @Override
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| 54 | public boolean evaluate(String string) {
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| 55 | return pattern.matcher(string).matches();
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| 56 | }
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| 57 | };
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| 58 | }
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| 59 |
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| 60 | /**
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| 61 | * Returns a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#find}.
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[8928] | 62 | * @param pattern the pattern
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| 63 | * @return a {@link Predicate} executing {@link Pattern#matcher(CharSequence)} and {@link java.util.regex.Matcher#find}
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[6547] | 64 | */
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| 65 | public static Predicate<String> stringContainsPattern(final Pattern pattern) {
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| 66 | return new Predicate<String>() {
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| 67 | @Override
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| 68 | public boolean evaluate(String string) {
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| 69 | return pattern.matcher(string).find();
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| 70 | }
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| 71 | };
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| 72 | }
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| 73 |
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| 74 | /**
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| 75 | * Returns a {@link Predicate} executing {@link String#contains(CharSequence)}.
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[8928] | 76 | * @param pattern the pattern
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| 77 | * @return a {@link Predicate} executing {@link String#contains(CharSequence)}
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[6547] | 78 | */
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| 79 | public static Predicate<String> stringContains(final String pattern) {
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| 80 | return new Predicate<String>() {
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| 81 | @Override
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| 82 | public boolean evaluate(String string) {
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| 83 | return string.contains(pattern);
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| 84 | }
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| 85 | };
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| 86 | }
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[6573] | 87 |
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| 88 | /**
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| 89 | * Returns a {@link Predicate} executing {@link OsmPrimitive#hasTag(String, String...)}.
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[8928] | 90 | * @param key the key forming the tag
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| 91 | * @param values one or many values forming the tag
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| 92 | * @return a {@link Predicate} executing {@link OsmPrimitive#hasTag(String, String...)}
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[6573] | 93 | */
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| 94 | public static Predicate<OsmPrimitive> hasTag(final String key, final String... values) {
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| 95 | return new Predicate<OsmPrimitive>() {
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| 96 | @Override
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| 97 | public boolean evaluate(OsmPrimitive p) {
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| 98 | return p.hasTag(key, values);
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| 99 | }
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| 100 | };
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| 101 | }
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[6652] | 102 |
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| 103 | /**
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[6870] | 104 | * Returns a {@link Predicate} executing {@link OsmPrimitive#hasKey(String)}.
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[8928] | 105 | * @param key the key
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| 106 | * @return a {@link Predicate} executing {@link OsmPrimitive#hasKey(String)}
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[6870] | 107 | */
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| 108 | public static Predicate<OsmPrimitive> hasKey(final String key) {
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| 109 | return new Predicate<OsmPrimitive>() {
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| 110 | @Override
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| 111 | public boolean evaluate(OsmPrimitive p) {
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| 112 | return p.hasKey(key);
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| 113 | }
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| 114 | };
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| 115 | }
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| 116 |
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| 117 | /**
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[6652] | 118 | * Returns a {@link Predicate} executing {@link Collection#contains(Object)}.
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[8928] | 119 | * @param target collection
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| 120 | * @return a {@link Predicate} executing {@link Collection#contains(Object)}
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[6652] | 121 | */
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| 122 | public static <T> Predicate<T> inCollection(final Collection<? extends T> target) {
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| 123 | return new Predicate<T>() {
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| 124 | @Override
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| 125 | public boolean evaluate(T object) {
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| 126 | return target.contains(object);
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| 127 | }
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| 128 | };
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| 129 | }
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[7170] | 130 |
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| 131 | /**
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| 132 | * Returns a {@link Predicate} testing whether objects are {@code null}.
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[8928] | 133 | * @return a {@link Predicate} testing whether objects are {@code null}
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[7170] | 134 | */
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| 135 | public static <T> Predicate<T> isNull() {
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| 136 | return new Predicate<T>() {
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| 137 | @Override
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| 138 | public boolean evaluate(T object) {
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| 139 | return object == null;
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| 140 | }
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| 141 | };
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| 142 | }
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[6547] | 143 | }
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