1 /* 2 * Copyright (C) 2009 Google Inc. 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.google.common.io; 18 19 import java.io.IOException; 20 21 /** 22 * A callback to be used with the streaming {@code readLines} methods. 23 * 24 * <p>{@link #processLine} will be called for each line that is read, and 25 * should return {@code false} when you want to stop processing. 26 * 27 * @author Miles Barr 28 * @since 2009.09.15 <b>tentative</b> 29 */ 30 public interface LineProcessor<T> { 31 32 /** 33 * This method will be called once for each line. 34 * 35 * @param line the line read from the input, without delimiter 36 * @return true to continue processing, false to stop 37 */ processLine(String line)38 boolean processLine(String line) throws IOException; 39 40 /** Return the result of processing all the lines. */ getResult()41 T getResult(); 42 } 43