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Java example source code file (Node.java)

This example Java source code file (Node.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

allowed_in_lb, anchor, consaltnode, enclose, list, node, nodetype, null, override, simple, string, stringbuilder, util, warncallback

The Node.java Java example source code

/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is furnished to do
 * so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package jdk.nashorn.internal.runtime.regexp.joni.ast;

import java.util.Set;

import jdk.nashorn.internal.runtime.regexp.joni.Config;
import jdk.nashorn.internal.runtime.regexp.joni.WarnCallback;
import jdk.nashorn.internal.runtime.regexp.joni.constants.NodeType;

public abstract class Node implements NodeType {
    public Node parent;

    public abstract int getType();

    public final int getType2Bit() {
        return 1 << getType();
    }

    protected void setChild(Node tgt){}         // default definition
    protected Node getChild(){return null;}     // default definition

    public void swap(Node with) {
        Node tmp;

        //if (getChild() != null) getChild().parent = with;
        //if (with.getChild() != null) with.getChild().parent = this;

        //tmp = getChild();
        //setChild(with.getChild());
        //with.setChild(tmp);

        if (parent != null) parent.setChild(with);

        if (with.parent != null) with.parent.setChild(this);

        tmp = parent;
        parent = with.parent;
        with.parent = tmp;
    }

    // overridden by ConsAltNode and CallNode
    public void verifyTree(Set<Node> set, WarnCallback warnings) {
        if (!set.contains(this) && getChild() != null) {
            set.add(this);
            if (getChild().parent != this) {
                warnings.warn("broken link to child: " + this.getAddressName() + " -> " + getChild().getAddressName());
            }
            getChild().verifyTree(set, warnings);
        }
    }

    public abstract String getName();
    protected abstract String toString(int level);

    public String getAddressName() {
        return getName() + ":0x" + Integer.toHexString(System.identityHashCode(this));
    }

    @Override
    public final String toString() {
        StringBuilder s = new StringBuilder();
        s.append("<" + getAddressName() + " (" + (parent == null ? "NULL" : parent.getAddressName())  + ")>");
        return s + toString(0);
    }

    protected static String pad(Object value, int level) {
        if (value == null) return "NULL";

        StringBuilder pad = new StringBuilder("  ");
        for (int i=0; i<level; i++) pad.append(pad);

        return value.toString().replace("\n",  "\n" + pad);
    }

    public final boolean isInvalidQuantifier() {
        if (!Config.VANILLA) return false;

        ConsAltNode node;

        switch(getType()) {

        case ANCHOR:
            return true;

        case ENCLOSE:
            /* allow enclosed elements */
            /* return is_invalid_quantifier_target(NENCLOSE(node)->target); */
            break;

        case LIST:
            node = (ConsAltNode)this;
            do {
                if (!node.car.isInvalidQuantifier()) return false;
            } while ((node = node.cdr) != null);
            return false;

        case ALT:
            node = (ConsAltNode)this;
            do {
                if (node.car.isInvalidQuantifier()) return true;
            } while ((node = node.cdr) != null);
            break;

        default:
            break;
        }

        return false;
    }

    public final boolean isAllowedInLookBehind() {
        return (getType2Bit() & ALLOWED_IN_LB) != 0;
    }

    public final boolean isSimple() {
        return (getType2Bit() & SIMPLE) != 0;
    }
}

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