1 /* 2 * Copyright (C) 2009 The Guava Authors 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 com.google.common.annotations.Beta; 20 21 import java.io.IOException; 22 23 /** 24 * A callback to be used with the streaming {@code readLines} methods. 25 * 26 * <p>{@link #processLine} will be called for each line that is read, and 27 * should return {@code false} when you want to stop processing. 28 * 29 * @author Miles Barr 30 * @since 1.0 31 */ 32 @Beta 33 public interface LineProcessor<T> { 34 35 /** 36 * This method will be called once for each line. 37 * 38 * @param line the line read from the input, without delimiter 39 * @return true to continue processing, false to stop 40 */ processLine(String line)41 boolean processLine(String line) throws IOException; 42 43 /** Return the result of processing all the lines. */ getResult()44 T getResult(); 45 } 46