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 android.text.format.Time;
20 
21 import java.io.FileDescriptor;
22 import java.io.PrintWriter;
23 import java.util.Calendar;
24 import java.util.Iterator;
25 import java.util.LinkedList;
26 
27 /**
28  * @hide
29  */
30 public final class LocalLog {
31 
32     private LinkedList<String> mLog;
33     private int mMaxLines;
34     private long mNow;
35 
LocalLog(int maxLines)36     public LocalLog(int maxLines) {
37         mLog = new LinkedList<String>();
38         mMaxLines = maxLines;
39     }
40 
log(String msg)41     public synchronized void log(String msg) {
42         if (mMaxLines > 0) {
43             mNow = System.currentTimeMillis();
44             StringBuilder sb = new StringBuilder();
45             Calendar c = Calendar.getInstance();
46             c.setTimeInMillis(mNow);
47             sb.append(String.format("%tm-%td %tH:%tM:%tS.%tL", c, c, c, c, c, c));
48             mLog.add(sb.toString() + " - " + msg);
49             while (mLog.size() > mMaxLines) mLog.remove();
50         }
51     }
52 
dump(FileDescriptor fd, PrintWriter pw, String[] args)53     public synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
54         Iterator<String> itr = mLog.listIterator(0);
55         while (itr.hasNext()) {
56             pw.println(itr.next());
57         }
58     }
59 }
60