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Jetty example source code file (MultiException.java)

This example Jetty source code file (MultiException.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 - Jetty tags/keywords

error, error, exception, exception, io, list, multiexception, multiexception, multiple, object, runtimeexception, runtimeexception, string, throwable, util

The Jetty MultiException.java source code

// ========================================================================
// Copyright 1999-2005 Mort Bay Consulting Pty. Ltd.
// ------------------------------------------------------------------------
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at 
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ========================================================================

package org.mortbay.util;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.util.List;


/* ------------------------------------------------------------ */
/** Wraps multiple exceptions.
 *
 * Allows multiple exceptions to be thrown as a single exception.
 *
 * @author Greg Wilkins (gregw)
 */
public class MultiException extends Exception
{
    private Object nested;

    /* ------------------------------------------------------------ */
    public MultiException()
    {
        super("Multiple exceptions");
    }

    /* ------------------------------------------------------------ */
    public void add(Throwable e)
    {
        if (e instanceof MultiException)
        {
            MultiException me = (MultiException)e;
            for (int i=0;i<LazyList.size(me.nested);i++)
                nested=LazyList.add(nested,LazyList.get(me.nested,i));
        }
        else
            nested=LazyList.add(nested,e);
    }

    /* ------------------------------------------------------------ */
    public int size()
    {
        return LazyList.size(nested);
    }
    
    /* ------------------------------------------------------------ */
    public List getThrowables()
    {
        return LazyList.getList(nested);
    }
    
    /* ------------------------------------------------------------ */
    public Throwable getThrowable(int i)
    {
        return (Throwable) LazyList.get(nested,i);
    }

    /* ------------------------------------------------------------ */
    /** Throw a multiexception.
     * If this multi exception is empty then no action is taken. If it
     * contains a single exception that is thrown, otherwise the this
     * multi exception is thrown. 
     * @exception Exception 
     */
    public void ifExceptionThrow()
        throws Exception
    {
        switch (LazyList.size(nested))
        {
          case 0:
              break;
          case 1:
              Throwable th=(Throwable)LazyList.get(nested,0);
              if (th instanceof Error)
                  throw (Error)th;
              if (th instanceof Exception)
                  throw (Exception)th;
          default:
              throw this;
        }
    }
    
    /* ------------------------------------------------------------ */
    /** Throw a Runtime exception.
     * If this multi exception is empty then no action is taken. If it
     * contains a single error or runtime exception that is thrown, otherwise the this
     * multi exception is thrown, wrapped in a runtime exception. 
     * @exception Error If this exception contains exactly 1 {@link Error} 
     * @exception RuntimeException If this exception contains 1 {@link Throwable} but it is not an error,
     *                             or it contains more than 1 {@link Throwable} of any type.
     */
    public void ifExceptionThrowRuntime()
        throws Error
    {
        switch (LazyList.size(nested))
        {
          case 0:
              break;
          case 1:
              Throwable th=(Throwable)LazyList.get(nested,0);
              if (th instanceof Error)
                  throw (Error)th;
              else if (th instanceof RuntimeException)
                  throw (RuntimeException)th;
              else
                  throw new RuntimeException(th);
          default:
              throw new RuntimeException(this);
        }
    }
    
    /* ------------------------------------------------------------ */
    /** Throw a multiexception.
     * If this multi exception is empty then no action is taken. If it
     * contains a any exceptions then this
     * multi exception is thrown. 
     */
    public void ifExceptionThrowMulti()
        throws MultiException
    {
        if (LazyList.size(nested)>0)
            throw this;
    }

    /* ------------------------------------------------------------ */
    public String toString()
    {
        if (LazyList.size(nested)>0)
            return "org.mortbay.util.MultiException"+
                LazyList.getList(nested);
        return "org.mortbay.util.MultiException[]";
    }

    /* ------------------------------------------------------------ */
    public void printStackTrace()
    {
        super.printStackTrace();
        for (int i=0;i<LazyList.size(nested);i++)
            ((Throwable)LazyList.get(nested,i)).printStackTrace();
    }
   

    /* ------------------------------------------------------------------------------- */
    /**
     * @see java.lang.Throwable#printStackTrace(java.io.PrintStream)
     */
    public void printStackTrace(PrintStream out)
    {
        super.printStackTrace(out);
        for (int i=0;i<LazyList.size(nested);i++)
            ((Throwable)LazyList.get(nested,i)).printStackTrace(out);
    }

    /* ------------------------------------------------------------------------------- */
    /**
     * @see java.lang.Throwable#printStackTrace(java.io.PrintWriter)
     */
    public void printStackTrace(PrintWriter out)
    {
        super.printStackTrace(out);
        for (int i=0;i<LazyList.size(nested);i++)
            ((Throwable)LazyList.get(nested,i)).printStackTrace(out);
    }

}

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