Java example source code file (TTNode.java)

This example Java source code file (TTNode.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.

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Java - Java tags/keywords

arraylist, classcase, cnone, idefault, ipresent, ivac, kind, list, ttnode, util

The TTNode.java Java example source code

/*
 * Copyright (c) 2012, 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 org.openjdk.tests.shapegen;

import org.openjdk.tests.shapegen.ClassCase.Kind;

import java.util.ArrayList;
import java.util.List;
import java.util.Set;

import static org.openjdk.tests.shapegen.ClassCase.Kind.*;

/**
 * Type Template Node
 *
 * @author Robert Field
 */
public class TTNode {

    final List<TTNode> supertypes;
    final boolean canBeClass;

    private int currentKindIndex;
    private Kind[] kinds;

    public TTNode(List<TTNode> subtypes, boolean canBeClass) {
        this.supertypes = subtypes;
        this.canBeClass = canBeClass;
    }

    public void start(boolean includeClasses) {
        kinds =
             supertypes.isEmpty()?
                (new Kind[]{IDEFAULT, IPRESENT})
             :  ((includeClasses && canBeClass)?
                  new Kind[]{CNONE, IVAC, IDEFAULT, IPRESENT}
                : new Kind[]{IVAC, IDEFAULT, IPRESENT});
        currentKindIndex = 0;

        for (TTNode sub : supertypes) {
            sub.start(includeClasses);
        }
    }

    public boolean next() {
        ++currentKindIndex;
        if (currentKindIndex >= kinds.length) {
            currentKindIndex = 0;
            return false;
        } else {
            return true;
        }
    }

    public void collectAllSubtypes(Set<TTNode> subs) {
        subs.add(this);
        for (TTNode n : supertypes) {
            n.collectAllSubtypes(subs);
        }
    }

    private Kind getKind() {
        return kinds[currentKindIndex];
    }

    boolean isInterface() {
        return getKind().isInterface;
    }

    boolean isClass() {
        return !isInterface();
    }

    boolean hasDefault() {
        return getKind() == IDEFAULT;
    }

    public boolean isValid() {
        for (TTNode n : supertypes) {
            if (!n.isValid() || (isInterface() && n.isClass())) {
                return false;
            }
        }
        return true;
    }

    public ClassCase genCase() {
        ClassCase subclass;
        List<TTNode> ttintfs;
        if (isClass() && !supertypes.isEmpty() && supertypes.get(0).isClass()) {
            subclass = supertypes.get(0).genCase();
            ttintfs = supertypes.subList(1, supertypes.size());
        } else {
            subclass = null;
            ttintfs = supertypes;
        }
        List<ClassCase> intfs = new ArrayList<>();
        for (TTNode node : ttintfs) {
            intfs.add(node.genCase());
        }
        return new ClassCase(getKind(), subclass, intfs);
    }
}