| /* |
| * Copyright 2000-2013 JetBrains s.r.o. |
| * |
| * 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.intellij.util.containers; |
| |
| import com.intellij.util.ObjectUtils; |
| import gnu.trove.THashMap; |
| import org.jetbrains.annotations.NotNull; |
| import org.jetbrains.annotations.Nullable; |
| |
| import java.util.*; |
| |
| import static com.intellij.util.ObjectUtils.NULL; |
| |
| /** |
| * @author peter |
| */ |
| public abstract class FactoryMap<K,V> implements Map<K, V> { |
| protected Map<K,V> myMap; |
| |
| protected Map<K, V> createMap() { |
| return new THashMap<K, V>(); |
| } |
| |
| @Nullable |
| protected abstract V create(K key); |
| |
| private Map<K, V> getMap() { |
| if (myMap == null) { |
| myMap = createMap(); |
| } |
| return myMap; |
| } |
| |
| @Override |
| public V get(Object key) { |
| final Map<K, V> map = getMap(); |
| V value = map.get(getKey(key)); |
| if (value == null) { |
| value = create((K)key); |
| map.put((K)getKey(key), value == null ? (V)NULL : value); |
| } |
| return value == NULL ? null : value; |
| } |
| |
| private static <K> K getKey(final K key) { |
| return key == null ? (K)NULL : key; |
| } |
| |
| @Override |
| public final boolean containsKey(Object key) { |
| return myMap != null && myMap.containsKey(getKey(key)); |
| } |
| |
| @Override |
| public V put(K key, V value) { |
| V v = getMap().put(getKey(key), value == null ? (V)NULL : value); |
| return v == NULL ? null : v; |
| } |
| |
| @Override |
| public V remove(Object key) { |
| if (myMap == null) return null; |
| V v = myMap.remove(key); |
| return v == NULL ? null : v; |
| } |
| |
| @NotNull |
| @Override |
| public Set<K> keySet() { |
| if (myMap == null) return Collections.emptySet(); |
| final Set<K> ts = myMap.keySet(); |
| if (ts.contains(NULL)) { |
| final HashSet<K> hashSet = new HashSet<K>(ts); |
| hashSet.remove(NULL); |
| hashSet.add(null); |
| return hashSet; |
| } |
| return ts; |
| } |
| |
| public Collection<V> notNullValues() { |
| if (myMap == null) return Collections.emptyList(); |
| final Collection<V> values = ContainerUtil.newArrayList(myMap.values()); |
| for (Iterator<V> iterator = values.iterator(); iterator.hasNext();) { |
| if (iterator.next() == NULL) { |
| iterator.remove(); |
| } |
| } |
| return values; |
| } |
| |
| public boolean removeValue(Object value) { |
| if (myMap == null) return false; |
| Object t = ObjectUtils.notNull(value, NULL); |
| return myMap.values().remove(t); |
| } |
| |
| |
| @Override |
| public void clear() { |
| if (myMap != null) { |
| myMap.clear(); |
| } |
| } |
| |
| @Override |
| public int size() { |
| if (myMap == null) return 0; |
| return myMap.size(); |
| } |
| |
| @Override |
| public boolean isEmpty() { |
| return myMap == null || myMap.isEmpty(); |
| } |
| |
| @Override |
| public boolean containsValue(final Object value) { |
| return myMap != null && myMap.containsValue(value); |
| } |
| |
| @Override |
| public void putAll(@NotNull final Map<? extends K, ? extends V> m) { |
| for (Entry<? extends K, ? extends V> entry : m.entrySet()) { |
| put(entry.getKey(), entry.getValue()); |
| } |
| } |
| |
| @NotNull |
| @Override |
| public Collection<V> values() { |
| if (myMap == null) return Collections.emptyList(); |
| return myMap.values(); |
| } |
| |
| @NotNull |
| @Override |
| public Set<Entry<K, V>> entrySet() { |
| if (myMap == null) return Collections.emptySet(); |
| return myMap.entrySet(); |
| } |
| } |