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Java example source code file (AbstractType.java)

This example Java source code file (AbstractType.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

abstracttype, batchenvironment, classdefinition, classnotfound, compilererror, contextstack, false, remotetype, string, tm_compound, tm_interface, util, vector

The AbstractType.java Java example source code

/*
 * Copyright (c) 1998, 2007, 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.
 */

/*
 * Licensed Materials - Property of IBM
 * RMI-IIOP v1.0
 * Copyright IBM Corp. 1998 1999  All Rights Reserved
 *
 */

package sun.rmi.rmic.iiop;

import java.util.Vector;
import sun.tools.java.CompilerError;
import sun.tools.java.ClassNotFound;
import sun.tools.java.ClassDefinition;

/**
 * AbstractType represents any non-special interface which does not
 * inherit from java.rmi.Remote, for which all methods throw RemoteException.
 * <p>
 * The static forAbstract(...) method must be used to obtain an instance, and will
 * return null if the ClassDefinition is non-conforming.
 * @author      Bryan Atsatt
 */
public class AbstractType extends RemoteType {

    //_____________________________________________________________________
    // Public Interfaces
    //_____________________________________________________________________

    /**
     * Create an AbstractType for the given class.
     *
     * If the class is not a properly formed or if some other error occurs, the
     * return value will be null, and errors will have been reported to the
     * supplied BatchEnvironment.
     */
    public static AbstractType forAbstract(ClassDefinition classDef,
                                           ContextStack stack,
                                           boolean quiet)
    {
        boolean doPop = false;
        AbstractType result = null;

        try {

            // Do we already have it?

            sun.tools.java.Type theType = classDef.getType();
            Type existing = getType(theType,stack);

            if (existing != null) {

                if (!(existing instanceof AbstractType)) return null; // False hit.

                                // Yep, so return it...

                return (AbstractType) existing;

            }

            // Could this be an abstract?

            if (couldBeAbstract(stack,classDef,quiet)) {

                // Yes, so try it...

                AbstractType it = new AbstractType(stack, classDef);
                putType(theType,it,stack);
                stack.push(it);
                doPop = true;

                if (it.initialize(quiet,stack)) {
                    stack.pop(true);
                    result = it;
                } else {
                    removeType(theType,stack);
                    stack.pop(false);
                }
            }
        } catch (CompilerError e) {
            if (doPop) stack.pop(false);
        }

        return result;
    }

    /**
     * Return a string describing this type.
     */
    public String getTypeDescription () {
        return "Abstract interface";
    }

    //_____________________________________________________________________
    // Internal/Subclass Interfaces
    //_____________________________________________________________________

    /**
     * Create a AbstractType instance for the given class.  The resulting
     * object is not yet completely initialized.
     */
    private AbstractType(ContextStack stack, ClassDefinition classDef) {
        super(stack,classDef,TYPE_ABSTRACT | TM_INTERFACE | TM_COMPOUND);
    }

    //_____________________________________________________________________
    // Internal Interfaces
    //_____________________________________________________________________


    private static boolean couldBeAbstract(ContextStack stack, ClassDefinition classDef,
                                           boolean quiet) {

        // Return true if interface and not remote...

        boolean result = false;

        if (classDef.isInterface()) {
            BatchEnvironment env = stack.getEnv();

            try {
                result = ! env.defRemote.implementedBy(env, classDef.getClassDeclaration());
                if (!result) failedConstraint(15,quiet,stack,classDef.getName());
            } catch (ClassNotFound e) {
                classNotFound(stack,e);
            }
        } else {
            failedConstraint(14,quiet,stack,classDef.getName());
        }


        return result;
    }


    /**
     * Initialize this instance.
     */
    private boolean initialize (boolean quiet,ContextStack stack) {

        boolean result = false;
        ClassDefinition self = getClassDefinition();

        try {

            // Get methods...

            Vector directMethods = new Vector();

            if (addAllMethods(self,directMethods,true,quiet,stack) != null) {

                // Do we have any methods?

                boolean validMethods = true;

                if (directMethods.size() > 0) {

                                // Yes. Walk 'em, ensuring each is a valid remote method...

                    for (int i = 0; i < directMethods.size(); i++) {

                        if (! isConformingRemoteMethod((Method) directMethods.elementAt(i),true)) {
                            validMethods = false;
                        }
                    }
                }

                if (validMethods) {

                    // We're ok, so pass 'em up...

                    result = initialize(null,directMethods,null,stack,quiet);
                }
            }
        } catch (ClassNotFound e) {
            classNotFound(stack,e);
        }

        return result;
    }
}

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