Java example source code file (InterfaceTypeImpl.java)

This example Java source code file (InterfaceTypeImpl.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

arraylist, classtype, interfacetype, interfacetypeimpl, iterator, jdi, list, method, referencetype, referencetypeimpl, softreference, string, util

The InterfaceTypeImpl.java Java example source code

/*
 * Copyright (c) 1998, 2011, 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.tools.jdi;

import com.sun.jdi.*;

import java.util.List;
import java.util.ArrayList;
import java.util.Map;
import java.util.Iterator;
import java.util.Collections;
import java.lang.ref.SoftReference;

public class InterfaceTypeImpl extends ReferenceTypeImpl
                               implements InterfaceType {

    private SoftReference<List superinterfacesRef = null;

    protected InterfaceTypeImpl(VirtualMachine aVm,long aRef) {
        super(aVm, aRef);
    }

    public List<InterfaceType> superinterfaces() {
        List<InterfaceType> superinterfaces = (superinterfacesRef == null) ? null :
                                     superinterfacesRef.get();
        if (superinterfaces == null) {
            superinterfaces = getInterfaces();
            superinterfaces = Collections.unmodifiableList(superinterfaces);
            superinterfacesRef = new SoftReference<List(superinterfaces);
        }
        return superinterfaces;
    }

    public List<InterfaceType> subinterfaces() {
        List<InterfaceType> subs = new ArrayList();
        for (ReferenceType refType : vm.allClasses()) {
            if (refType instanceof InterfaceType) {
                InterfaceType interfaze = (InterfaceType)refType;
                if (interfaze.isPrepared() && interfaze.superinterfaces().contains(this)) {
                    subs.add(interfaze);
                }
            }
        }
        return subs;
    }

    public List<ClassType> implementors() {
        List<ClassType> implementors = new ArrayList();
        for (ReferenceType refType : vm.allClasses()) {
            if (refType instanceof ClassType) {
                ClassType clazz = (ClassType)refType;
                if (clazz.isPrepared() && clazz.interfaces().contains(this)) {
                    implementors.add(clazz);
                }
            }
        }
        return implementors;
    }

    void addVisibleMethods(Map<String, Method> methodMap) {
        /*
         * Add methods from
         * parent types first, so that the methods in this class will
         * overwrite them in the hash table
         */

        for (InterfaceType interfaze : superinterfaces()) {
            ((InterfaceTypeImpl)interfaze).addVisibleMethods(methodMap);
        }

        addToMethodMap(methodMap, methods());
    }

    public List<Method> allMethods() {
        ArrayList<Method> list = new ArrayList(methods());

        /*
         * It's more efficient if don't do this
         * recursively.
         */
        for (InterfaceType interfaze : allSuperinterfaces()) {
            list.addAll(interfaze.methods());
        }

        return list;
    }

    List<InterfaceType> allSuperinterfaces() {
        ArrayList<InterfaceType> list = new ArrayList();
        addSuperinterfaces(list);
        return list;
    }

    void addSuperinterfaces(List<InterfaceType> list) {
        /*
         * This code is a little strange because it
         * builds the list with a more suitable order than the
         * depth-first approach a normal recursive solution would
         * take. Instead, all direct superinterfaces precede all
         * indirect ones.
         */

        /*
         * Get a list of direct superinterfaces that's not already in the
         * list being built.
         */
        List<InterfaceType> immediate = new ArrayList(superinterfaces());
        Iterator<InterfaceType> iter = immediate.iterator();
        while (iter.hasNext()) {
            InterfaceType interfaze = iter.next();
            if (list.contains(interfaze)) {
                iter.remove();
            }
        }

        /*
         * Add all new direct superinterfaces
         */
        list.addAll(immediate);

        /*
         * Recurse for all new direct superinterfaces.
         */
        iter = immediate.iterator();
        while (iter.hasNext()) {
            InterfaceTypeImpl interfaze = (InterfaceTypeImpl)iter.next();
            interfaze.addSuperinterfaces(list);
        }
    }

    boolean isAssignableTo(ReferenceType type) {

        // Exact match?
        if (this.equals(type)) {
            return true;
        } else {
            // Try superinterfaces.
            for (InterfaceType interfaze : superinterfaces()) {
                if (((InterfaceTypeImpl)interfaze).isAssignableTo(type)) {
                    return true;
                }
            }

            return false;
        }
    }

    List<InterfaceType> inheritedTypes() {
        return superinterfaces();
    }

    public boolean isInitialized() {
        return isPrepared();
    }

    public String toString() {
       return "interface " + name() + " (" + loaderString() + ")";
    }
}