| /* |
| * Copyright (C) 2009 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.checkNotNull; |
| |
| import java.util.Collections; |
| import java.util.Map; |
| import java.util.Set; |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| |
| /** |
| * GWT implementation of {@link ImmutableMap} that forwards to another map. |
| * |
| * @author Hayward Chan |
| */ |
| public abstract class ForwardingImmutableMap<K, V> extends ImmutableMap<K, V> { |
| |
| final transient Map<K, V> delegate; |
| |
| ForwardingImmutableMap(Map<? extends K, ? extends V> delegate) { |
| this.delegate = Collections.unmodifiableMap(delegate); |
| } |
| |
| @SuppressWarnings("unchecked") |
| ForwardingImmutableMap(Entry<? extends K, ? extends V>... entries) { |
| Map<K, V> delegate = Maps.newLinkedHashMap(); |
| for (Entry<? extends K, ? extends V> entry : entries) { |
| K key = checkNotNull(entry.getKey()); |
| V previous = delegate.put(key, checkNotNull(entry.getValue())); |
| if (previous != null) { |
| throw new IllegalArgumentException("duplicate key: " + key); |
| } |
| } |
| this.delegate = Collections.unmodifiableMap(delegate); |
| } |
| |
| boolean isPartialView() { |
| return false; |
| } |
| |
| public final boolean isEmpty() { |
| return delegate.isEmpty(); |
| } |
| |
| public final boolean containsKey(@Nullable Object key) { |
| return Maps.safeContainsKey(delegate, key); |
| } |
| |
| public final boolean containsValue(@Nullable Object value) { |
| return delegate.containsValue(value); |
| } |
| |
| public V get(@Nullable Object key) { |
| return (key == null) ? null : Maps.safeGet(delegate, key); |
| } |
| |
| @Override |
| ImmutableSet<Entry<K, V>> createEntrySet() { |
| return ImmutableSet.unsafeDelegate( |
| new ForwardingSet<Entry<K, V>>() { |
| @Override |
| protected Set<Entry<K, V>> delegate() { |
| return delegate.entrySet(); |
| } |
| |
| @Override |
| public boolean contains(Object object) { |
| if (object instanceof Entry<?, ?> && ((Entry<?, ?>) object).getKey() == null) { |
| return false; |
| } |
| try { |
| return super.contains(object); |
| } catch (ClassCastException e) { |
| return false; |
| } |
| } |
| |
| @Override |
| public <T> T[] toArray(T[] array) { |
| T[] result = super.toArray(array); |
| if (size() < result.length) { |
| // It works around a GWT bug where elements after last is not |
| // properly null'ed. |
| result[size()] = null; |
| } |
| return result; |
| } |
| }); |
| } |
| |
| @Override |
| ImmutableSet<K> createKeySet() { |
| return ImmutableSet.unsafeDelegate(delegate.keySet()); |
| } |
| |
| @Override |
| ImmutableCollection<V> createValues() { |
| return ImmutableCollection.unsafeDelegate(delegate.values()); |
| } |
| |
| @Override |
| public int size() { |
| return delegate.size(); |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object object) { |
| return delegate.equals(object); |
| } |
| |
| @Override |
| public int hashCode() { |
| return delegate.hashCode(); |
| } |
| |
| @Override |
| public String toString() { |
| return delegate.toString(); |
| } |
| } |