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/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright (c) 1997-2010 Oracle and/or its affiliates. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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*
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*
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*/
package com.sun.enterprise.admin.cli.remote;
import java.util.ArrayList;
import java.util.List;
/** An immutable class to analyze the exception stack trace of a given
* instance of {@link java.lang.Exception}. Can be extended to handle
* throwables, but it is not done in this version on purpose. Takes the
* snapshot of given exception at the time of instantiation.
* @author केदार ([email protected])
* @since GlassFish v3 Prelude
*/
final class ExceptionAnalyzer {
private final Exception exc;
private final List chain;
ExceptionAnalyzer(Exception e) {
if (e == null)
throw new IllegalArgumentException("null arg");
this.exc = e;
this.chain = new ArrayList();
chain.add(exc);
build();
}
private void build() {
Throwable t = exc.getCause();
while (t != null) {
chain.add(t);
t = t.getCause();
}
}
/** Returns the first instance of the given Exception class in the chain
* of causes. The counting starts from the instance of the Exception that
* created the ExceptionAnalyzer class itself.
* @param ac the unknown subclass of Exception that needs the chain to be examined for
* @return first instance of given Throwable (returned object will be an
* instance of the given class) or null if there is no such instance
*/
Throwable getFirstInstanceOf(Class ac) {
for (Throwable t : chain) {
try {
ac.cast(t);
return t;
} catch(ClassCastException cce) {
//ignore and continue
}
}
return null;
}
}