Java Doc for ChainableExceptionHelper.java in  » Test-Coverage » GroboUtils » net » sourceforge » groboutils » util » throwable » v1 » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Test Coverage » GroboUtils » net.sourceforge.groboutils.util.throwable.v1 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   net.sourceforge.groboutils.util.throwable.v1.ChainableExceptionHelper

ChainableExceptionHelper
public class ChainableExceptionHelper implements Serializable(Code)
Helper class to support easy-to-implement chainable exceptions. In most situations, it is close to impossible to create a generic chainable exception due to inheritance restrictions on the Java exception hierarchy (this shows a Java weakness - exception categories should be interfaces, not specific classes).

This will attempt to use the owning source's initCause() and getCause() methods, provided the owning source provides those methods. Only the superclass's implementation that provides these methods yet does not implement IChainableException will be used (to prevent a possible recursion nightmare).

In order to prevent endless recursion, this class will not look at the JDK 1.4 implementation of the source exception. This used to work with JDK 1.4.0, but JDK 1.4.2 seems to have broken the original implementation.
author:
   Matt Albrecht groboclown@users.sourceforge.net
version:
   $Date: 2003/05/06 05:35:01 $
since:
   July 7, 2002




Constructor Summary
public  ChainableExceptionHelper(Throwable source)
     Sets the owning throwable.
public  ChainableExceptionHelper(Throwable source, Throwable cause)
    

Method Summary
public  ThrowablegetCause()
     JDK 1.4 compatible method.

from the JDK 1.4 documentation:

Returns the cause of this throwable or null if the cause is nonexistent or unknown.
protected  StringgetUnderlyingExceptionSeparator()
    
protected  StringgetUnknownExceptionString()
    
public synchronized  ThrowableinitCause(Throwable cause)
     JDK 1.4 compatible method.

from the JDK 1.4 documentation:

Initializes the cause of this throwable to the specified value. (The cause is the throwable that caused this throwable to get thrown.)

This method can be called at most once.

public  voidprintStackTrace(PrintStream ps)
     For non-JDK 1.4 compatible VMs, this overrides the original behavior to describe the underlying cause.
public  voidprintStackTrace(PrintWriter pw)
     For non-JDK 1.4 compatible VMs, this overrides the original behavior to describe the underlying cause.
protected  booleanshouldDisplayCause()
    


Constructor Detail
ChainableExceptionHelper
public ChainableExceptionHelper(Throwable source)(Code)
Sets the owning throwable. The initCause() method can still be called after this constructor is used.



ChainableExceptionHelper
public ChainableExceptionHelper(Throwable source, Throwable cause)(Code)




Method Detail
getCause
public Throwable getCause()(Code)
JDK 1.4 compatible method.

from the JDK 1.4 documentation:

Returns the cause of this throwable or null if the cause is nonexistent or unknown. (The cause is the throwable that caused this throwable to get thrown.)

This implementation returns the cause that was supplied via one of the constructors requiring a Throwable, or that was set after creation with the initCause( Throwable ) 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 Throwable. Note that it is not necessary to override any of the PrintStackTrace methods, all of which invoke the getCause method to determine the cause of a throwable.

the cause of this throwable or null if the cause isnonexistent or unknown.



getUnderlyingExceptionSeparator
protected String getUnderlyingExceptionSeparator()(Code)



getUnknownExceptionString
protected String getUnknownExceptionString()(Code)



initCause
public synchronized Throwable initCause(Throwable cause)(Code)
JDK 1.4 compatible method.

from the JDK 1.4 documentation:

Initializes the cause of this throwable to the specified value. (The cause is the throwable that caused this throwable to get thrown.)

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.


Parameters:
  cause - the cause (which is saved for later retrieval by thegetCause() method). (A null value is permitted, and indicatesthat the cause is nonexistent or unknown.)
Parameters:
  source - the exception that will be the underlying exception 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 withThrowable(Throwable) or Throwable(String,Throwable), or thismethod has already been called on this throwable.



printStackTrace
public void printStackTrace(PrintStream ps)(Code)
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).



printStackTrace
public void printStackTrace(PrintWriter pw)(Code)
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).



shouldDisplayCause
protected boolean shouldDisplayCause()(Code)



Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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