86 lines
2.9 KiB
Java
86 lines
2.9 KiB
Java
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/*
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* Copyright (C) 2008 The Guava Authors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.common.collect;
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import java.lang.reflect.Array;
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import java.util.Collections;
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import java.util.Map;
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import java.util.NavigableMap;
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import java.util.NavigableSet;
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import java.util.Set;
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import java.util.SortedMap;
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import java.util.SortedSet;
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import com.google.common.annotations.GwtCompatible;
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import com.google.common.base.Function;
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import com.google.common.base.Predicate;
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import com.google.common.collect.Maps.EntryTransformer;
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/**
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* Methods factored out so that they can be emulated differently in GWT.
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*
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* @author Hayward Chan
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*/
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@GwtCompatible(emulated = true)
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final class Platform {
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/**
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* Returns a new array of the given length with the same type as a reference
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* array.
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*
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* @param reference any array of the desired type
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* @param length the length of the new array
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*/
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static <T> T[] newArray(T[] reference, int length) {
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Class<?> type = reference.getClass().getComponentType();
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// the cast is safe because
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// result.getClass() == reference.getClass().getComponentType()
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@SuppressWarnings("unchecked")
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T[] result = (T[]) Array.newInstance(type, length);
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return result;
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}
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static <E> Set<E> newSetFromMap(Map<E, Boolean> map) {
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return Collections.newSetFromMap(map);
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}
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static <K, V1, V2> SortedMap<K, V2> mapsTransformEntriesSortedMap(SortedMap<K, V1> fromMap,
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EntryTransformer<? super K, ? super V1, V2> transformer) {
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return (fromMap instanceof NavigableMap) ? Maps.transformEntries((NavigableMap<K, V1>) fromMap, transformer)
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: Maps.transformEntriesIgnoreNavigable(fromMap, transformer);
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}
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static <K, V> SortedMap<K, V> mapsAsMapSortedSet(SortedSet<K> set, Function<? super K, V> function) {
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return (set instanceof NavigableSet) ? Maps.asMap((NavigableSet<K>) set, function)
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: Maps.asMapSortedIgnoreNavigable(set, function);
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}
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static <E> SortedSet<E> setsFilterSortedSet(SortedSet<E> set, Predicate<? super E> predicate) {
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return (set instanceof NavigableSet) ? Sets.filter((NavigableSet<E>) set, predicate)
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: Sets.filterSortedIgnoreNavigable(set, predicate);
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}
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static <K, V> SortedMap<K, V> mapsFilterSortedMap(SortedMap<K, V> map,
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Predicate<? super Map.Entry<K, V>> predicate) {
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return (map instanceof NavigableMap) ? Maps.filterEntries((NavigableMap<K, V>) map, predicate)
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: Maps.filterSortedIgnoreNavigable(map, predicate);
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}
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private Platform() {
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}
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}
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