1/* 2 * Copyright (C) 2011 The Android Open Source Project 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 17package android.support.v4.util; 18 19import android.util.Log; 20 21import java.io.Writer; 22 23/** 24 * Helper for accessing features in {@link android.util.LogWriter} 25 * introduced after API level 4 in a backwards compatible fashion. 26 * 27 * @hide 28 */ 29public class LogWriter extends Writer { 30 private final String mTag; 31 private StringBuilder mBuilder = new StringBuilder(128); 32 33 /** 34 * Create a new Writer that sends to the log with the given priority 35 * and tag. 36 * 37 * @param tag A string tag to associate with each printed log statement. 38 */ 39 public LogWriter(String tag) { 40 mTag = tag; 41 } 42 43 @Override public void close() { 44 flushBuilder(); 45 } 46 47 @Override public void flush() { 48 flushBuilder(); 49 } 50 51 @Override public void write(char[] buf, int offset, int count) { 52 for(int i = 0; i < count; i++) { 53 char c = buf[offset + i]; 54 if ( c == '\n') { 55 flushBuilder(); 56 } 57 else { 58 mBuilder.append(c); 59 } 60 } 61 } 62 63 private void flushBuilder() { 64 if (mBuilder.length() > 0) { 65 Log.d(mTag, mBuilder.toString()); 66 mBuilder.delete(0, mBuilder.length()); 67 } 68 } 69} 70