1 /* 2 * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 import java.util.AbstractCollection; 24 import java.util.HashSet; 25 import java.util.AbstractSet; 26 import java.util.ArrayList; 27 import java.util.Collection; 28 import java.util.Iterator; 29 import java.util.function.Supplier; 30 31 /** 32 * @library 33 * 34 * A simple mutable collection implementation that provides only default 35 * implementations of all methods. ie. none of the Collection interface default 36 * methods have overridden implementations. 37 * 38 * @param <E> type of collection elements 39 */ 40 public class ExtendsAbstractCollection<C extends Collection<E>, E> extends AbstractCollection<E> { 41 42 protected final C coll; 43 44 public ExtendsAbstractCollection() { 45 this(() -> {return (C) new ArrayList<E>();}); 46 } 47 48 public ExtendsAbstractCollection(Collection<E> source) { 49 this(); 50 coll.addAll(source); 51 } 52 53 protected ExtendsAbstractCollection(Supplier<C> backer) { 54 this.coll = backer.get(); 55 } 56 57 public boolean add(E element) { 58 return coll.add(element); 59 } 60 61 public boolean remove(Object element) { 62 return coll.remove(element); 63 } 64 65 public Iterator<E> iterator() { 66 return new Iterator<E>() { 67 Iterator<E> source = coll.iterator(); 68 69 public boolean hasNext() { 70 return source.hasNext(); 71 } 72 73 public E next() { 74 return source.next(); 75 } 76 77 public void remove() { 78 source.remove(); 79 } 80 }; 81 } 82 83 public int size() { 84 return coll.size(); 85 } 86 }