Glassfish example source code file (ExceptionAnalyzer.java)

This example Glassfish source code file (ExceptionAnalyzer.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Glassfish tags/keywords

arraylist, arraylist, exception, exception, exceptionanalyzer, exceptionanalyzer, illegalargumentexception, list, throwable, throwable, util

The Glassfish ExceptionAnalyzer.java source code

/*
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 *
 * 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
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 * file and include the License file at packager/legal/LICENSE.txt.
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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 (km@dev.java.net)
 * @since GlassFish v3 Prelude
 */

final class ExceptionAnalyzer {
    
    private final Exception exc;
    private final List<Throwable> chain;
    ExceptionAnalyzer(Exception e) {
        if (e == null)
            throw new IllegalArgumentException("null arg");
        this.exc   = e;
        this.chain = new ArrayList<Throwable>();
        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<? extends Exception> ac) {
        for (Throwable t : chain) {
            try {
                ac.cast(t);
                return t;
            } catch(ClassCastException cce) {
                //ignore and continue
            }
        }
        return null;
    }
}