| /* |
| * 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 |
| * |
| * https://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.apache.tools.ant.filters; |
| |
| /** |
| * Like the Unix uniq(1) command, only returns tokens that are |
| * different from their ancestor token. |
| * |
| * <p>This filter is probably most useful if used together with a |
| * sortfilter.</p> |
| * |
| * @since Ant 1.8.0 |
| */ |
| public class UniqFilter extends TokenFilter.ChainableReaderFilter { |
| |
| private String lastLine = null; |
| |
| public String filter(String string) { |
| if (lastLine == null || !lastLine.equals(string)) { |
| lastLine = string; |
| return lastLine; |
| } |
| return null; |
| } |
| } |