| /******************************************************************************* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.ofbiz.base.util.collections; |
| |
| import java.util.Collection; |
| import java.util.Iterator; |
| import java.util.LinkedList; |
| import java.util.List; |
| import java.util.Map; |
| |
| public abstract class GenericMapCollection<K, V, M extends Map<K, V>, I> implements Collection<I> { |
| protected final M source; |
| |
| public GenericMapCollection(M source) { |
| this.source = source; |
| } |
| |
| public boolean add(I item) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public boolean addAll(Collection<? extends I> collection) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| public void clear() { |
| source.clear(); |
| } |
| |
| public boolean containsAll(Collection<?> collection) { |
| for (Object item: collection) { |
| if (!contains(item)) return false; |
| } |
| return true; |
| } |
| |
| public boolean isEmpty() { |
| return source.isEmpty(); |
| } |
| |
| public final Iterator<I> iterator() { |
| return iterator(true); |
| } |
| |
| protected abstract Iterator<I> iterator(boolean noteAccess); |
| |
| public boolean removeAll(Collection<?> collection) { |
| int count = 0; |
| for (Object item: collection) { |
| if (remove(item)) count++; |
| } |
| return count > 0; |
| } |
| |
| public boolean retainAll(Collection<?> collection) { |
| int count = 0; |
| Iterator<I> it = iterator(false); |
| while (it.hasNext()) { |
| I item = it.next(); |
| if (!collection.contains(item)) { |
| it.remove(); |
| count++; |
| } |
| } |
| return count > 0; |
| } |
| |
| public int size() { |
| return source.size(); |
| } |
| |
| public Object[] toArray() { |
| List<I> list = new LinkedList<I>(); |
| Iterator<I> it = iterator(false); |
| while (it.hasNext()) { |
| list.add(it.next()); |
| } |
| return list.toArray(); |
| } |
| |
| public <T> T[] toArray(T[] array) { |
| List<Object> list = new LinkedList<Object>(); |
| Iterator<I> it = iterator(false); |
| while (it.hasNext()) { |
| list.add(it.next()); |
| } |
| return list.toArray(array); |
| } |
| |
| @Override |
| public String toString() { |
| return appendTo(new StringBuilder()).toString(); |
| } |
| |
| public StringBuilder appendTo(StringBuilder sb) { |
| sb.append("["); |
| Iterator<I> it = iterator(false); |
| while (it.hasNext()) { |
| sb.append(it.next()); |
| if (it.hasNext()) sb.append(", "); |
| } |
| return sb.append("]"); |
| } |
| } |
| |