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The source code/* * Copyright (C) The Apache Software Foundation. All rights reserved. * * This software is published under the terms of the Apache Software * License version 1.1, a copy of which has been included with this * distribution in the LICENSE.txt file. */ package org.apache.log4j.spi; import java.io.Writer; import java.io.PrintWriter; import java.util.Vector; /** * ThrowableInformation is log4j's internal representation of * throwables. It essentially consists of a string array, called * 'rep', where the first element, that is rep[0], represents the * string representation of the throwable (i.e. the value you get * when you do throwable.toString()) and subsequent elements * correspond the stack trace with the top most entry of the stack * corresponding to the second entry of the 'rep' array that is * rep[1]. * * @author Ceki Gülcü * * */ public class ThrowableInformation implements java.io.Serializable { static final long serialVersionUID = -4748765566864322735L; private transient Throwable throwable; private String[] rep; public ThrowableInformation(Throwable throwable) { this.throwable = throwable; } public Throwable getThrowable() { return throwable; } public String[] getThrowableStrRep() { if(rep != null) { return (String[]) rep.clone(); } else { VectorWriter vw = new VectorWriter(); throwable.printStackTrace(vw); rep = vw.toStringArray(); return rep; } } } /** * VectorWriter is a seemingly trivial implemtantion of PrintWriter. * The throwable instance that we are trying to represnt is asked to * print itself to a VectorWriter. * * By our design choice, r string representation of the throwable * does not contain any line separators. It follows that println() * methods of VectorWriter ignore the 'ln' part. * */ class VectorWriter extends PrintWriter { private Vector v; VectorWriter() { super(new NullWriter()); v = new Vector(); } public void print(Object o) { v.addElement(o.toString()); } public void print(char[] chars) { v.addElement(new String(chars)); } public void print(String s) { v.addElement(s); } public void println(Object o) { v.addElement(o.toString()); } // JDK 1.1.x apprenly uses this form of println while in // printStackTrace() public void println(char[] chars) { v.addElement(new String(chars)); } public void println(String s) { v.addElement(s); } public void write(char[] chars) { v.addElement(new String(chars)); } public void write(char[] chars, int off, int len) { v.addElement(new String(chars, off, len)); } public void write(String s, int off, int len) { v.addElement(s.substring(off, off+len)); } public void write(String s) { v.addElement(s); } public String[] toStringArray() { int len = v.size(); String[] sa = new String[len]; for(int i = 0; i < len; i++) { sa[i] = (String) v.elementAt(i); } return sa; } } class NullWriter extends Writer { public void close() { // blank } public void flush() { // blank } public void write(char[] cbuf, int off, int len) { // blank } } |
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