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Java example source code file (ExceptionHandlerImpl.java)

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

Learn more about this Java project at its project page.

Java - Java tags/keywords

applicationexception, class, corba, exception, exceptionhandlerimpl, exceptionrw, exceptionrwbase, exceptionrwidlimpl, exceptionrwrmiimpl, helper, inputstream, method, object, outputstream, reflection, rmi, string

The ExceptionHandlerImpl.java Java example source code

/*
 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.corba.se.impl.presentation.rmi ;

import java.io.Serializable ;
import java.io.Externalizable ;

import javax.rmi.PortableRemoteObject ;
import javax.rmi.CORBA.Util ;

import java.rmi.RemoteException ;
import java.rmi.UnexpectedException ;

import org.omg.CORBA.UserException ;

import org.omg.CORBA_2_3.portable.InputStream ;
import org.omg.CORBA_2_3.portable.OutputStream ;
import org.omg.CORBA.portable.ApplicationException ;

import java.lang.reflect.Method ;

import com.sun.corba.se.spi.logging.CORBALogDomains ;
import com.sun.corba.se.impl.logging.ORBUtilSystemException ;

public class ExceptionHandlerImpl implements ExceptionHandler
{
    private ExceptionRW[] rws ;

    private final ORBUtilSystemException wrapper ;

///////////////////////////////////////////////////////////////////////////////
// ExceptionRW interface and implementations.
// Used to read and write exceptions.
///////////////////////////////////////////////////////////////////////////////

    public interface ExceptionRW
    {
        Class getExceptionClass() ;

        String getId() ;

        void write( OutputStream os, Exception ex ) ;

        Exception read( InputStream is ) ;
    }

    public abstract class ExceptionRWBase implements ExceptionRW
    {
        private Class cls ;
        private String id ;

        public ExceptionRWBase( Class cls )
        {
            this.cls = cls ;
        }

        public Class getExceptionClass()
        {
            return cls ;
        }

        public String getId()
        {
            return id ;
        }

        void setId( String id )
        {
            this.id = id ;
        }
    }

    public class ExceptionRWIDLImpl extends ExceptionRWBase
    {
        private Method readMethod ;
        private Method writeMethod ;

        public ExceptionRWIDLImpl( Class cls )
        {
            super( cls ) ;

            String helperName = cls.getName() + "Helper" ;
            ClassLoader loader = cls.getClassLoader() ;
            Class helperClass ;

            try {
                helperClass = Class.forName( helperName, true, loader ) ;
                Method idMethod = helperClass.getDeclaredMethod( "id", (Class[])null ) ;
                setId( (String)idMethod.invoke( null, (Object[])null ) ) ;
            } catch (Exception ex) {
                throw wrapper.badHelperIdMethod( ex, helperName ) ;
            }

            try {
                Class[] argTypes = new Class[] {
                    org.omg.CORBA.portable.OutputStream.class, cls } ;
                writeMethod = helperClass.getDeclaredMethod( "write",
                    argTypes ) ;
            } catch (Exception ex) {
                throw wrapper.badHelperWriteMethod( ex, helperName ) ;
            }

            try {
                Class[] argTypes = new Class[] {
                    org.omg.CORBA.portable.InputStream.class } ;
                readMethod = helperClass.getDeclaredMethod( "read", argTypes ) ;
            } catch (Exception ex) {
                throw wrapper.badHelperReadMethod( ex, helperName ) ;
            }
        }

        public void write( OutputStream os, Exception ex )
        {
            try {
                Object[] args = new Object[] { os, ex } ;
                writeMethod.invoke( null, args ) ;
            } catch (Exception exc) {
                throw wrapper.badHelperWriteMethod( exc,
                    writeMethod.getDeclaringClass().getName() ) ;
            }
        }

        public Exception read( InputStream is )
        {
            try {
                Object[] args = new Object[] { is } ;
                return (Exception)readMethod.invoke( null, args ) ;
            } catch (Exception ex) {
                throw wrapper.badHelperReadMethod( ex,
                    readMethod.getDeclaringClass().getName() ) ;
            }
        }
    }

    public class ExceptionRWRMIImpl extends ExceptionRWBase
    {
        public ExceptionRWRMIImpl( Class cls )
        {
            super( cls ) ;
            setId( IDLNameTranslatorImpl.getExceptionId( cls ) ) ;
        }

        public void write( OutputStream os, Exception ex )
        {
            os.write_string( getId() ) ;
            os.write_value( ex, getExceptionClass() ) ;
        }

        public Exception read( InputStream is )
        {
            is.read_string() ; // read and ignore!
            return (Exception)is.read_value( getExceptionClass() ) ;
        }
    }

///////////////////////////////////////////////////////////////////////////////

    public ExceptionHandlerImpl( Class[] exceptions )
    {
        wrapper = ORBUtilSystemException.get(
            CORBALogDomains.RPC_PRESENTATION ) ;

        int count = 0 ;
        for (int ctr=0; ctr<exceptions.length; ctr++) {
            Class cls = exceptions[ctr] ;
            if (!RemoteException.class.isAssignableFrom(cls))
                count++ ;
        }

        rws = new ExceptionRW[count] ;

        int index = 0 ;
        for (int ctr=0; ctr<exceptions.length; ctr++) {
            Class cls = exceptions[ctr] ;
            if (!RemoteException.class.isAssignableFrom(cls)) {
                ExceptionRW erw = null ;
                if (UserException.class.isAssignableFrom(cls))
                    erw = new ExceptionRWIDLImpl( cls ) ;
                else
                    erw = new ExceptionRWRMIImpl( cls ) ;

                /* The following check is not performed
                 * in order to maintain compatibility with
                 * rmic.  See bug 4989312.

                // Check for duplicate repository ID
                String repositoryId = erw.getId() ;
                int duplicateIndex = findDeclaredException( repositoryId ) ;
                if (duplicateIndex > 0) {
                    ExceptionRW duprw = rws[duplicateIndex] ;
                    String firstClassName =
                        erw.getExceptionClass().getName() ;
                    String secondClassName =
                        duprw.getExceptionClass().getName() ;
                    throw wrapper.duplicateExceptionRepositoryId(
                        firstClassName, secondClassName, repositoryId ) ;
                }

                */

                rws[index++] = erw ;
            }
        }
    }

    private int findDeclaredException( Class cls )
    {
        for (int ctr = 0; ctr < rws.length; ctr++) {
            Class next = rws[ctr].getExceptionClass() ;
            if (next.isAssignableFrom(cls))
                return ctr ;
        }

        return -1 ;
    }

    private int findDeclaredException( String repositoryId )
    {
        for (int ctr=0; ctr<rws.length; ctr++) {
            // This may occur when rws has not been fully
            // populated, in which case the search should just fail.
            if (rws[ctr]==null)
                return -1 ;

            String rid = rws[ctr].getId() ;
            if (repositoryId.equals( rid ))
                return ctr ;
        }

        return -1 ;
    }

    public boolean isDeclaredException( Class cls )
    {
        return findDeclaredException( cls ) >= 0 ;
    }

    public void writeException( OutputStream os, Exception ex )
    {
        int index = findDeclaredException( ex.getClass() ) ;
        if (index < 0)
            throw wrapper.writeUndeclaredException( ex,
                ex.getClass().getName() ) ;

        rws[index].write( os, ex ) ;
    }

    public Exception readException( ApplicationException ae )
    {
        // Note that the exception ID is present in both ae
        // and in the input stream from ae.  The exception
        // reader must actually read the exception ID from
        // the stream.
        InputStream is = (InputStream)ae.getInputStream() ;
        String excName = ae.getId() ;
        int index = findDeclaredException( excName ) ;
        if (index < 0) {
            excName = is.read_string() ;
            Exception res = new UnexpectedException( excName ) ;
            res.initCause( ae ) ;
            return res ;
        }

        return rws[index].read( is ) ;
    }

    // This is here just for the dynamicrmiiiop test
    public ExceptionRW getRMIExceptionRW( Class cls )
    {
        return new ExceptionRWRMIImpl( cls ) ;
    }
}

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