/*
* Copyright (C) 2008 The Guava Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.google.common.collect;
import static com.google.common.base.Preconditions.checkArgument;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Maps.EntryTransformer;
import java.io.Serializable;
import java.util.AbstractSet;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import javax.annotation.Nullable;
/**
* Minimal GWT emulation of {@code com.google.common.collect.Platform}.
*
* <p><strong>This .java file should never be consumed by javac.</strong>
*
* @author Hayward Chan
*/
final class Platform {
static <T> T[] newArray(T[] reference, int length) {
return GwtPlatform.newArray(reference, length);
}
/*
* Regarding newSetForMap() and SetFromMap:
*
* Written by Doug Lea with assistance from members of JCP JSR-166
* Expert Group and released to the public domain, as explained at
* http://creativecommons.org/licenses/publicdomain
*/
static <E> Set<E> newSetFromMap(Map<E, Boolean> map) {
return new SetFromMap<E>(map);
}
private static class SetFromMap<E> extends AbstractSet<E>
implements Set<E>, Serializable {
private final Map<E, Boolean> m; // The backing map
private transient Set<E> s; // Its keySet
SetFromMap(Map<E, Boolean> map) {
checkArgument(map.isEmpty(), "Map is non-empty");
m = map;
s = map.keySet();
}
@Override public void clear() {
m.clear();
}
@Override public int size() {
return m.size();
}
@Override public boolean isEmpty() {
return m.isEmpty();
}
@Override public boolean contains(Object o) {
return m.containsKey(o);
}
@Override public boolean remove(Object o) {
return m.remove(o) != null;
}
@Override public boolean add(E e) {
return m.put(e, Boolean.TRUE) == null;
}
@Override public Iterator<E> iterator() {
return s.iterator();
}
@Override public Object[] toArray() {
return s.toArray();
}
@Override public <T> T[] toArray(T[] a) {
return s.toArray(a);
}
@Override public String toString() {
return s.toString();
}
@Override public int hashCode() {
return s.hashCode();
}
@Override public boolean equals(@Nullable Object object) {
return this == object || this.s.equals(object);
}
@Override public boolean containsAll(Collection<?> c) {
return s.containsAll(c);
}
@Override public boolean removeAll(Collection<?> c) {
return s.removeAll(c);
}
@Override public boolean retainAll(Collection<?> c) {
return s.retainAll(c);
}
}
static MapMaker tryWeakKeys(MapMaker mapMaker) {
return mapMaker;
}
static <K, V1, V2> SortedMap<K, V2> mapsTransformEntriesSortedMap(
SortedMap<K, V1> fromMap,
EntryTransformer<? super K, ? super V1, V2> transformer) {
return Maps.transformEntriesIgnoreNavigable(fromMap, transformer);
}
static <K, V> SortedMap<K, V> mapsAsMapSortedSet(
SortedSet<K> set, Function<? super K, V> function) {
return Maps.asMapSortedIgnoreNavigable(set, function);
}
static <E> SortedSet<E> setsFilterSortedSet(
SortedSet<E> unfiltered, Predicate<? super E> predicate) {
return Sets.filterSortedIgnoreNavigable(unfiltered, predicate);
}
static <K, V> SortedMap<K, V> mapsFilterSortedMap(
SortedMap<K, V> unfiltered, Predicate<? super Map.Entry<K, V>> predicate) {
return Maps.filterSortedIgnoreNavigable(unfiltered, predicate);
}
private Platform() {}
}