eaglercraft-1.8/sources/main/java/com/google/common/collect/Platform.java
2022-12-25 01:12:28 -08:00

86 lines
2.9 KiB
Java

/*
* 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 java.lang.reflect.Array;
import java.util.Collections;
import java.util.Map;
import java.util.NavigableMap;
import java.util.NavigableSet;
import java.util.Set;
import java.util.SortedMap;
import java.util.SortedSet;
import com.google.common.annotations.GwtCompatible;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.Maps.EntryTransformer;
/**
* Methods factored out so that they can be emulated differently in GWT.
*
* @author Hayward Chan
*/
@GwtCompatible(emulated = true)
final class Platform {
/**
* Returns a new array of the given length with the same type as a reference
* array.
*
* @param reference any array of the desired type
* @param length the length of the new array
*/
static <T> T[] newArray(T[] reference, int length) {
Class<?> type = reference.getClass().getComponentType();
// the cast is safe because
// result.getClass() == reference.getClass().getComponentType()
@SuppressWarnings("unchecked")
T[] result = (T[]) Array.newInstance(type, length);
return result;
}
static <E> Set<E> newSetFromMap(Map<E, Boolean> map) {
return Collections.newSetFromMap(map);
}
static <K, V1, V2> SortedMap<K, V2> mapsTransformEntriesSortedMap(SortedMap<K, V1> fromMap,
EntryTransformer<? super K, ? super V1, V2> transformer) {
return (fromMap instanceof NavigableMap) ? Maps.transformEntries((NavigableMap<K, V1>) fromMap, transformer)
: Maps.transformEntriesIgnoreNavigable(fromMap, transformer);
}
static <K, V> SortedMap<K, V> mapsAsMapSortedSet(SortedSet<K> set, Function<? super K, V> function) {
return (set instanceof NavigableSet) ? Maps.asMap((NavigableSet<K>) set, function)
: Maps.asMapSortedIgnoreNavigable(set, function);
}
static <E> SortedSet<E> setsFilterSortedSet(SortedSet<E> set, Predicate<? super E> predicate) {
return (set instanceof NavigableSet) ? Sets.filter((NavigableSet<E>) set, predicate)
: Sets.filterSortedIgnoreNavigable(set, predicate);
}
static <K, V> SortedMap<K, V> mapsFilterSortedMap(SortedMap<K, V> map,
Predicate<? super Map.Entry<K, V>> predicate) {
return (map instanceof NavigableMap) ? Maps.filterEntries((NavigableMap<K, V>) map, predicate)
: Maps.filterSortedIgnoreNavigable(map, predicate);
}
private Platform() {
}
}