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Java example source code file (ServiceContextData.java)

This example Java source code file (ServiceContextData.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

bad_param, class, corba, could, finding, getting, illegalaccessexception, illegalargumentexception, inputstream, object, reflection, service_context_id, servicecontextdata, string, throwable, unexpected

The ServiceContextData.java Java example source code

/*
 * Copyright (c) 1999, 2003, 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.spi.servicecontext;

import org.omg.CORBA.BAD_PARAM ;
import org.omg.CORBA_2_3.portable.InputStream ;
import com.sun.corba.se.spi.servicecontext.ServiceContext ;
import java.lang.reflect.InvocationTargetException ;
import java.lang.reflect.Modifier ;
import java.lang.reflect.Field ;
import java.lang.reflect.Constructor ;
import com.sun.corba.se.spi.ior.iiop.GIOPVersion;
import com.sun.corba.se.spi.orb.ORB ;
import com.sun.corba.se.impl.orbutil.ORBUtility ;

/** Internal class used to hold data about a service context class.
*/
public class ServiceContextData {
    private void dprint( String msg )
    {
        ORBUtility.dprint( this, msg ) ;
    }

    private void throwBadParam( String msg, Throwable exc )
    {
        BAD_PARAM error = new BAD_PARAM( msg ) ;
        if (exc != null)
            error.initCause( exc ) ;
        throw error ;
    }

    public ServiceContextData( Class cls )
    {
        if (ORB.ORBInitDebug)
            dprint( "ServiceContextData constructor called for class " + cls ) ;

        scClass = cls ;

        try {
            if (ORB.ORBInitDebug)
                dprint( "Finding constructor for " + cls ) ;

            // Find the appropriate constructor in cls
            Class[] args = new Class[2] ;
            args[0] = InputStream.class ;
            args[1] = GIOPVersion.class;
            try {
                scConstructor = cls.getConstructor( args ) ;
            } catch (NoSuchMethodException nsme) {
                throwBadParam( "Class does not have an InputStream constructor", nsme ) ;
            }

            if (ORB.ORBInitDebug)
                dprint( "Finding SERVICE_CONTEXT_ID field in " + cls ) ;

            // get the ID from the public static final int SERVICE_CONTEXT_ID
            Field fld = null ;
            try {
                fld = cls.getField( "SERVICE_CONTEXT_ID" ) ;
            } catch (NoSuchFieldException nsfe) {
                throwBadParam( "Class does not have a SERVICE_CONTEXT_ID member", nsfe ) ;
            } catch (SecurityException se) {
                throwBadParam( "Could not access SERVICE_CONTEXT_ID member", se ) ;
            }

            if (ORB.ORBInitDebug)
                dprint( "Checking modifiers of SERVICE_CONTEXT_ID field in " + cls ) ;

            int mod = fld.getModifiers() ;
            if (!Modifier.isPublic(mod) || !Modifier.isStatic(mod) ||
                !Modifier.isFinal(mod) )
                throwBadParam( "SERVICE_CONTEXT_ID field is not public static final", null ) ;

            if (ORB.ORBInitDebug)
                dprint( "Getting value of SERVICE_CONTEXT_ID in " + cls ) ;

            try {
                scId = fld.getInt( null ) ;
            } catch (IllegalArgumentException iae) {
                throwBadParam( "SERVICE_CONTEXT_ID not convertible to int", iae ) ;
            } catch (IllegalAccessException iae2) {
                throwBadParam( "Could not access value of SERVICE_CONTEXT_ID", iae2 ) ;
            }
        } catch (BAD_PARAM nssc) {
            if (ORB.ORBInitDebug)
                dprint( "Exception in ServiceContextData constructor: " + nssc ) ;
            throw nssc ;
        } catch (Throwable thr) {
            if (ORB.ORBInitDebug)
                dprint( "Unexpected Exception in ServiceContextData constructor: " +
                        thr ) ;
        }

        if (ORB.ORBInitDebug)
            dprint( "ServiceContextData constructor completed" ) ;
    }

    /** Factory method used to create a ServiceContext object by
     * unmarshalling it from the InputStream.
     */
    public ServiceContext makeServiceContext(InputStream is, GIOPVersion gv)
    {
        Object[] args = new Object[2];
        args[0] = is ;
        args[1] = gv;
        ServiceContext sc = null ;

        try {
            sc = (ServiceContext)(scConstructor.newInstance( args )) ;
        } catch (IllegalArgumentException iae) {
            throwBadParam( "InputStream constructor argument error", iae ) ;
        } catch (IllegalAccessException iae2) {
            throwBadParam( "InputStream constructor argument error", iae2 ) ;
        } catch (InstantiationException ie) {
            throwBadParam( "InputStream constructor called for abstract class", ie ) ;
        } catch (InvocationTargetException ite) {
            throwBadParam( "InputStream constructor threw exception " +
                ite.getTargetException(), ite ) ;
        }

        return sc ;
    }

    int getId()
    {
        return scId ;
    }

    public String toString()
    {
        return "ServiceContextData[ scClass=" + scClass + " scConstructor=" +
            scConstructor + " scId=" + scId + " ]" ;
    }

    private Class       scClass ;
    private Constructor scConstructor ;
    private int         scId ;
}

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