PrintWriterTreeLogger


1   /*
2    * Copyright 2006 Google Inc.
3    * 
4    * Licensed under the Apache License, Version 2.0 (the "License"); you may not
5    * use this file except in compliance with the License. You may obtain a copy of
6    * 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, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations under
14   * the License.
15   */
16  package com.google.gwt.dev.util.log;
17  
18  import java.io.PrintWriter  ;
19  
20  /**
21   * Tree logger that logs to a print writer.
22   */
23  public final class PrintWriterTreeLogger extends AbstractTreeLogger {
24  
25    private final PrintWriter   out;
26  
27    private final String   indent;
28  
29    public PrintWriterTreeLogger() {
30      this(new PrintWriter  (System.out, true));
31    }
32  
33    public PrintWriterTreeLogger(PrintWriter   out) {
34      this(out, "");
35    }
36  
37    protected PrintWriterTreeLogger(PrintWriter   out, String   indent) {
38      this.out = out;
39      this.indent = indent;
40    }
41  
42    protected AbstractTreeLogger doBranch() {
43      return new PrintWriterTreeLogger(out, indent + "   ");
44    }
45  
46    protected void doCommitBranch(AbstractTreeLogger childBeingCommitted,
47        Type type, String   msg, Throwable   caught) {
48      doLog(childBeingCommitted.getBranchedIndex(), type, msg, caught);
49    }
50  
51    protected void doLog(int indexOfLogEntryWithinParentLogger, Type type,
52        String   msg, Throwable   caught) {
53      out.print(indent);
54      if (type.needsAttention()) {
55        out.print("[");
56        out.print(type.getLabel());
57        out.print("] ");
58      }
59  
60      out.println(msg);
61      if (caught != null) {
62        caught.printStackTrace(out);
63      }
64    }
65  }
66
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