// UniqueList.java /** * Copyright (C) 2008 10gen Inc. * * 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.mongodb.util; import java.util.ArrayList; import java.util.Collection; public class UniqueList<T> extends ArrayList<T> { private static final long serialVersionUID = -4415279469780082174L; public boolean add( T t ){ if ( contains( t ) ) return false; return super.add( t ); } public boolean addAll(Collection<? extends T> c) { boolean added = false; for ( T t : c ) added = added || add( t ); return added; } }