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The Adobe Experience Manager SDK

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/*
 * Copyright (C) 2004-2011
 * 
 * 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 org.kohsuke.rngom.rngparser.digested;

import org.kohsuke.rngom.rngparser.ast.om.ParsedPattern;
import org.kohsuke.rngom.rngparser.parse.Parseable;
import org.xml.sax.Locator;

/**
 * Base class of all the patterns.
 *
 * @author Kohsuke Kawaguchi ([email protected])
 */
public abstract class DPattern implements ParsedPattern {
    Locator location;
    DAnnotation annotation;

    /**
     * Used to chain the child patterns in a doubly-linked list.
     */
    private DPattern next;
    DPattern prev;

    /**
     * Returns where the pattern is defined in the source code.
     */
    public Locator getLocation() {
        return location;
    }

    /**
     * Returns the annotation associated with it.
     *
     * @return
     *      may be empty, but never be null.
     */
    public DAnnotation getAnnotation() {
        if(annotation==null)
            return DAnnotation.EMPTY;
        return annotation;
    }

    /**
     * Returns true if this pattern is nullable.
     *
     * A nullable pattern is a pattern that can match the empty sequence.
     */
    public abstract boolean isNullable();

    public abstract  V accept( DPatternVisitor visitor );

    /**
     * Creates a {@link Parseable} object that reparses this pattern.
     */
    public Parseable createParseable() {
        return new PatternParseable(this);
    }

    /**
     * Returns true if this is {@link DElementPattern}.
     */
    public final boolean isElement() {
        return this instanceof DElementPattern;
    }

    /**
     * Returns true if this is {@link DAttributePattern}.
     */
    public final boolean isAttribute() {
        return this instanceof DAttributePattern;
    }

    // Harshit : Adding public methods for getNext() and setNext()
	public DPattern setNext(DPattern next) {
		this.next = next;
		return next;
	}

	public DPattern getNext() {
		return next;
	}
}