1 /* 2 * Copyright (C) 2006 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 17 package android.util; 18 19 import java.io.FileDescriptor; 20 import java.io.PrintWriter; 21 import java.util.Calendar; 22 import java.util.Iterator; 23 import java.util.LinkedList; 24 25 /** 26 * @hide 27 */ 28 public final class LocalLog { 29 30 private LinkedList<String> mLog; 31 private int mMaxLines; 32 private long mNow; 33 34 public LocalLog(int maxLines) { 35 mLog = new LinkedList<String>(); 36 mMaxLines = maxLines; 37 } 38 39 public synchronized void log(String msg) { 40 if (mMaxLines > 0) { 41 mNow = System.currentTimeMillis(); 42 StringBuilder sb = new StringBuilder(); 43 Calendar c = Calendar.getInstance(); 44 c.setTimeInMillis(mNow); 45 sb.append(String.format("%tm-%td %tH:%tM:%tS.%tL", c, c, c, c, c, c)); 46 mLog.add(sb.toString() + " - " + msg); 47 while (mLog.size() > mMaxLines) mLog.remove(); 48 } 49 } 50 51 public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 52 Iterator<String> itr = mLog.listIterator(0); 53 while (itr.hasNext()) { 54 pw.println(itr.next()); 55 } 56 } 57 58 public synchronized void reverseDump(FileDescriptor fd, PrintWriter pw, String[] args) { 59 for (int i = mLog.size() - 1; i >= 0; i--) { 60 pw.println(mLog.get(i)); 61 } 62 } 63 64 public static class ReadOnlyLocalLog { 65 private final LocalLog mLog; 66 ReadOnlyLocalLog(LocalLog log) { 67 mLog = log; 68 } 69 public void dump(FileDescriptor fd, PrintWriter pw, String[] args) { 70 mLog.dump(fd, pw, args); 71 } 72 } 73 74 public ReadOnlyLocalLog readOnlyLocalLog() { 75 return new ReadOnlyLocalLog(this); 76 } 77 } 78
