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1   /*
2    * Licensed to the Apache Software Foundation (ASF) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * The ASF licenses this file to You under the Apache License, Version 2.0
6    * (the "License"); you may not use this file except in compliance with
7    * the License.  You may obtain a copy of the License at
8    * 
9    *      http://www.apache.org/licenses/LICENSE-2.0
10   * 
11   * Unless required by applicable law or agreed to in writing, software
12   * distributed under the License is distributed on an "AS IS" BASIS,
13   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   * See the License for the specific language governing permissions and
15   * limitations under the License.
16   */
17  
18  package org.apache.log4j.spi;
19  
20  import java.io.IOException;
21  import java.io.LineNumberReader;
22  import java.io.PrintWriter;
23  import java.io.StringReader;
24  import java.io.StringWriter;
25  import java.util.ArrayList;
26  
27  /***
28    * ThrowableInformation is log4j's internal representation of
29    * throwables. It essentially consists of a string array, called
30    * 'rep', where the first element, that is rep[0], represents the
31    * string representation of the throwable (i.e. the value you get
32    * when you do throwable.toString()) and subsequent elements
33    * correspond the stack trace with the top most entry of the stack
34    * corresponding to the second entry of the 'rep' array that is
35    * rep[1].
36    *
37    * @author Ceki Gülcü
38    *
39    * */
40  public class ThrowableInformation implements java.io.Serializable {
41  
42    static final long serialVersionUID = -4748765566864322735L;
43  
44    private transient Throwable throwable;
45    private String[] rep;
46  
47    public
48    ThrowableInformation(Throwable throwable) {
49      this.throwable = throwable;
50    }
51  
52      /***
53       * Create new instance.
54       * @since 1.2.15
55       * @param r String representation of throwable.
56       */
57    public ThrowableInformation(final String[] r) {
58        if (r != null) {
59          rep = (String[]) r.clone();
60        }
61    }
62  
63  
64    public
65    Throwable getThrowable() {
66      return throwable;
67    }
68  
69    public
70    String[] getThrowableStrRep() {
71      if(rep != null) {
72        return (String[]) rep.clone();
73      } else {
74        StringWriter sw = new StringWriter();
75        PrintWriter pw = new PrintWriter(sw);
76        throwable.printStackTrace(pw);
77        pw.flush();
78        LineNumberReader reader = new LineNumberReader(
79                new StringReader(sw.toString()));
80        ArrayList lines = new ArrayList();
81        try {
82          String line = reader.readLine();
83          while(line != null) {
84            lines.add(line);
85            line = reader.readLine();
86          }
87        } catch(IOException ex) {
88            lines.add(ex.toString());
89        }
90        rep = new String[lines.size()];
91        lines.toArray(rep);
92      }
93      return rep;
94    }
95  }
96  
97