gw.lang.enhancements.CoreThrowableEnhancement.gsx Maven / Gradle / Ivy
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package gw.lang.enhancements
uses java.lang.RuntimeException
uses java.lang.Error
uses java.lang.Throwable
uses java.io.StringWriter
uses java.io.PrintWriter
uses java.util.IdentityHashMap
/*
* Copyright 2014 Guidewire Software, Inc.
*/
enhancement CoreThrowableEnhancement : java.lang.Throwable
{
/**
* Determines whether this Throwable is a "checked" exception.
*/
property get Checked() : Boolean
{
return not( this typeis Error or this typeis RuntimeException )
}
/**
* Gets the nearest Throwable of the given type in this Throwable chain.
*
* Returns this object if it is of the given type. Returns null if no Throwable
* exists in the cause chain that is of the given type.
*/
reified function getCauseOfType( causeType : Type ) : T
{
var visited = new IdentityHashMap()
var cause = this
while( cause != null and not causeType.Type.isAssignableFrom( typeof cause ) )
{
// handle loops in the cause chain
if( visited.put( cause, true ) )
{
// we've seen this one before, so bail out
return null
}
cause = cause.Cause
}
return cause as T
}
/**
* Gets this Throwable's stack trace, as a string.
*/
property get StackTraceAsString() : String
{
var buf = new StringWriter()
this.printStackTrace( new PrintWriter( buf ) )
return buf.toString()
}
}