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/*
* @(#)ChainableException.java
*
* Copyright (C) 2002-2003 Matt Albrecht
* groboclown@users.sourceforge.net
* http://groboutils.sourceforge.net
*
* Part of the GroboUtils package at:
* http://groboutils.sourceforge.net
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package net.sourceforge.groboutils.util.throwable.v1;
import java.io.PrintStream;
import java.io.PrintWriter;
/**
* General chainable exception, for pseudo-JDK 1.4 support.
*
* @author Matt Albrecht <a href="mailto:groboclown@users.sourceforge.net">groboclown@users.sourceforge.net</a>
* @version $Date: 2003/09/23 19:54:07 $
* @since July 7, 2002
*/
public class ChainableException extends Exception
implements IChainableException
{
/**
* @serial
*/
private ChainableExceptionHelper ceh;
public ChainableException()
{
super();
this.ceh = new ChainableExceptionHelper( this );
}
public ChainableException( String message )
{
super( message );
this.ceh = new ChainableExceptionHelper( this );
}
public ChainableException( Throwable cause )
{
super();
this.ceh = new ChainableExceptionHelper( this, cause );
}
public ChainableException( Throwable cause, String message )
{
this( message, cause );
}
public ChainableException( String message, Throwable cause )
{
super( message );
this.ceh = new ChainableExceptionHelper( this, cause );
}
/**
* JDK 1.4 compatible method.
* <P>
* <i>from the JDK 1.4 documentation:</i>
* <BLOCKQUOTE>
* Returns the cause of this throwable or <tt>null</tt> if the cause is
* nonexistent or unknown. (The cause is the throwable that caused this
* throwable to get thrown.)
* <P>
* This implementation returns the cause that was supplied via one of the
* constructors requiring a <tt>Throwable</tt>, or that was set after
* creation with the <tt>initCause( Throwable )</tt> method. While it is
* typically unnecessary to override this method, a subclass can override
* it to return a cause set by some other means. This is appropriate for a
* "legacy chained throwable" that predates the addition of chained
* exceptions to <tt>Throwable</tt>. Note that it is not necessary to
* override any of the <tt>PrintStackTrace</tt> methods, all of which
* invoke the getCause method to determine the cause of a throwable.
* </BLOCKQUOTE>
*
* @return the cause of this throwable or <tt>null</tt> if the cause is
* nonexistent or unknown.
*/
public synchronized Throwable getCause()
{
return this.ceh.getCause();
}
/**
* JDK 1.4 compatible method.
* <P>
* <i>from the JDK 1.4 documentation:</i>
* <BLOCKQUOTE>
* Initializes the cause of this throwable to the specified value.
* (The cause is the throwable that caused this throwable to get thrown.)
* <P>
* This method can be called at most once. It is generally called from
* within the constructor, or immediately after creating the throwable.
* If this throwable was created with Throwable(Throwable) or
* Throwable(String,Throwable), this method cannot be called even once.
* </BLOCKQUOTE>
*
* @param cause the cause (which is saved for later retrieval by the
* getCause() method). (A null value is permitted, and indicates
* that the cause is nonexistent or unknown.)
* @return a reference to this Throwable instance.
* @exception IllegalArgumentException if cause is this throwable.
* (A throwable cannot be its own cause.)
* @exception IllegalStateException if this throwable was created with
* Throwable(Throwable) or Throwable(String,Throwable), or this
* method has already been called on this throwable.
*/
public synchronized Throwable initCause( Throwable cause )
{
return this.ceh.initCause( cause );
}
/**
* For non-JDK 1.4 compatible VMs, this overrides the original behavior
* to describe the underlying cause. Special logic is performed to ensure
* that no JDK 1.4 VM is being used when the inner exception is displayed
* (in order to prevent double printing).
*/
public void printStackTrace( PrintStream ps )
{
this.ceh.printStackTrace( ps );
}
/**
* For non-JDK 1.4 compatible VMs, this overrides the original behavior
* to describe the underlying cause. Special logic is performed to ensure
* that no JDK 1.4 VM is being used when the inner exception is displayed
* (in order to prevent double printing).
*/
public void printStackTrace( PrintWriter pw )
{
this.ceh.printStackTrace( pw );
}
}
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