objectimpl.java

java1.6众多例子参考

/*
 * @(#)ObjectImpl.java	1.39 06/01/27
 *
 * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package org.omg.CORBA.portable;

import org.omg.CORBA.Request;
import org.omg.CORBA.NamedValue;
import org.omg.CORBA.NVList;
import org.omg.CORBA.ExceptionList;
import org.omg.CORBA.ContextList;
import org.omg.CORBA.Context;
import org.omg.CORBA.TypeCode;
import org.omg.CORBA.BAD_OPERATION;
import org.omg.CORBA.SystemException;


/**
 *  The common base class for all stub classes; provides default implementations
 *  of the <code>org.omg.CORBA.Object</code> methods. All method implementations are 
 *  forwarded to a <code>Delegate</code> object stored in the <code>ObjectImpl</code>
 *  instance.  <code>ObjectImpl</code> allows for portable stubs because the 
 *  <code>Delegate</code> can be implemented by a different vendor-specific ORB.
 */

abstract public class ObjectImpl implements org.omg.CORBA.Object
{

    /**
     * The field that stores the <code>Delegate</code> instance for 
     * this <code>ObjectImpl</code> object. This <code>Delegate</code>
     * instance can be implemented by a vendor-specific ORB.  Stub classes,
     * which are derived from this <code>ObjectImpl</code> class, can be
     * portable because they delegate all of the methods called on them to this
     * <code>Delegate</code> object.
     */
    private transient Delegate __delegate;


    /**
     * Retrieves the reference to the vendor-specific <code>Delegate</code> 
     * object to which this <code>ObjectImpl</code> object delegates all 
     * methods invoked on it.
     *
     * @return the Delegate contained in this ObjectImpl instance 
     * @throws BAD_OPERATION if the delegate has not been set
     * @see #_set_delegate
     */
    public Delegate _get_delegate() {
        if (__delegate == null)
	    throw new BAD_OPERATION("The delegate has not been set!");
        return __delegate;
    }


    /** 
     * Sets the Delegate for this <code>ObjectImpl</code> instance to the given
     * <code>Delegate</code> object.  All method invocations on this 
     * <code>ObjectImpl</code> object will be forwarded to this delegate.
     *
     * @param delegate the <code>Delegate</code> instance to which
     *        all method calls on this <code>ObjectImpl</code> object
     *        will be delegated; may be implemented by a third-party ORB
     * @see #_get_delegate
     */
    public void _set_delegate(Delegate delegate) {
        __delegate = delegate;
    }

    /** 
     * Retrieves a string array containing the repository identifiers
     * supported by this <code>ObjectImpl</code> object.  For example,
     * for a stub, this method returns information about all the
     * interfaces supported by the stub.
     *
     * @return the array of all repository identifiers supported by this
     *         <code>ObjectImpl</code> instance
     */
    public abstract String[] _ids();


    /**            
     * Returns a duplicate of this <code>ObjectImpl</code> object.
     *
     * @return an <code>orb.omg.CORBA.Object</code> object that is
     *         a duplicate of this object
     */
    public org.omg.CORBA.Object _duplicate() {
        return _get_delegate().duplicate(this);
    }

    /**            
     * Releases the resources associated with this <code>ObjectImpl</code> object.
     */
    public void _release() {
        _get_delegate().release(this);
    }

    /**            
     * Checks whether the object identified by the given repository 
     * identifier is an <code>ObjectImpl</code> object.
     *
     * @param repository_id a <code>String</code> object with the repository
     *        identifier to check
     * @return <code>true</code> if the object identified by the given
     *         repository id is an instance of <code>ObjectImpl</code>;
     *         <code>false</code> otherwise
     */
    public boolean _is_a(String repository_id) {
        return _get_delegate().is_a(this, repository_id);
    }

    /**            
     * Checks whether the the given <code>ObjectImpl</code> object is
     * equivalent to this <code>ObjectImpl</code> object.
     *
     * @param that an instance of <code>ObjectImpl</code> to compare with
     *        this <code>ObjectImpl</code> object
     * @return <code>true</code> if the given object is equivalent
     *         to this <code>ObjectImpl</code> object;
     *         <code>false</code> otherwise
     */
    public boolean _is_equivalent(org.omg.CORBA.Object that) {
        return _get_delegate().is_equivalent(this, that);
    }

    /** 
     * Checks whether the server object for this <code>ObjectImpl</code> 
     * object has been destroyed.
     * 
     * @return <code>true</code> if the ORB knows authoritatively that the
     *         server object does not exist; <code>false</code> otherwise
     */
    public boolean _non_existent() {
        return _get_delegate().non_existent(this);
    }

    /** 
     * Retrieves the hash code that serves as an ORB-internal identifier for 
     * this <code>ObjectImpl</code> object.
     *
     * @param maximum an <code>int</code> indicating the upper bound on the hash 
     *        value returned by the ORB
     * @return an <code>int</code> representing the hash code for this
     *         <code>ObjectImpl</code> object
     */
    public int _hash(int maximum) {
        return _get_delegate().hash(this, maximum);
    }

    /**
     * Creates a <code>Request</code> object containing the given method
     * that can be used with the Dynamic Invocation Interface.
     *
     * @param operation the method to be invoked by the new <code>Request</code>
     *        object
     * @return a new <code>Request</code> object initialized with the
     *         given method
     */
    public Request _request(String operation) {
        return _get_delegate().request(this, operation);
    }

    /**
     * Creates a <code>Request</code> object that contains the given context,
     * method, argument list, and container for the result.
     *
     * @param ctx the Context for the request
     * @param operation the method that the new <code>Request</code>
     *        object will invoke
     * @param arg_list the arguments for the method; an <code>NVList</code>
     *        in which each argument is a <code>NamedValue</code> object
     * @param result a <code>NamedValue</code> object to be used for 
     *        returning the result of executing the request's method
     * @return a new <code>Request</code> object initialized with the
     *         given context, method, argument list, and container for the
     *         return value
     */
    public Request _create_request(Context ctx,
				   String operation,
				   NVList arg_list,
				   NamedValue result) {
        return _get_delegate().create_request(this,
					      ctx,
					      operation,
					      arg_list,
					      result);
    }

    /**
     * Creates a <code>Request</code> object that contains the given context,
     * method, argument list, container for the result, exceptions, and
     * list of property names to be used in resolving the context strings.
     * This <code>Request</code> object is for use in the Dynamic
     * Invocation Interface.
     *
     * @param ctx the <code>Context</code> object that contains the
     *        context strings that must be resolved before they are 
     *        sent along with the request
     * @param operation the method that the new <code>Request</code>
     *        object will invoke
     * @param arg_list the arguments for the method; an <code>NVList</code>
     *        in which each argument is a <code>NamedValue</code> object
     * @param result a <code>NamedValue</code> object to be used for 
     *        returning the result of executing the request's method
     * @param exceptions a list of the exceptions that the given method
     *        throws
     * @param contexts a list of the properties that are needed to
     *        resolve the contexts in <i>ctx</i>; the strings in 
     *        <i>contexts</i> are used as arguments to the method
     *        <code>Context.get_values</code>,
     *        which returns the value associated with the given property
     * @return a new <code>Request</code> object initialized with the
     *         given context strings to resolve, method, argument list,
     *         container for the result, exceptions, and list of property
     *         names to be used in resolving the context strings
     */
    public Request _create_request(Context ctx,
				   String operation,
				   NVList arg_list,
				   NamedValue result,
				   ExceptionList exceptions,
				   ContextList contexts) {
        return _get_delegate().create_request(this,
					      ctx,
					      operation,
					      arg_list,
					      result,
					      exceptions,
					      contexts);
    }

    /** 
     * Retrieves the interface definition for this <code>ObjectImpl</code>
     * object.
     *
     * @return the <code>org.omg.CORBA.Object</code> instance that is the
     *         interface definition for this <code>ObjectImpl</code> object
     */
    public org.omg.CORBA.Object _get_interface_def() 
    {
	// First try to call the delegate implementation class's
	// "Object get_interface_def(..)" method (will work for JDK1.2 ORBs).
	// Else call the delegate implementation class's
	// "InterfaceDef get_interface(..)" method using reflection
	// (will work for pre-JDK1.2 ORBs).

        org.omg.CORBA.portable.Delegate delegate = _get_delegate();         
        try {
	    // If the ORB's delegate class does not implement 
	    // "Object get_interface_def(..)", this will call 
	    // get_interface_def(..) on portable.Delegate. 
            return delegate.get_interface_def(this);
        } 
	catch( org.omg.CORBA.NO_IMPLEMENT ex ) {
	    // Call "InterfaceDef get_interface(..)" method using reflection.
            try {