xpathpatternimpl.java

Java的面向对象数据库系统的源代码

/*
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * This software is open source.
 * See the bottom of this file for the licence.
 *
 * $Id: XPathPatternImpl.java,v 1.2 2003/11/02 18:10:04 per_nyfelt Exp $
 */

package org.ozoneDB.xml.dom4j.xpath;

import org.dom4j.InvalidXPathException;
import org.dom4j.Node;
import org.dom4j.XPathException;
import org.jaxen.*;
import org.jaxen.dom4j.DocumentNavigator;
import org.jaxen.pattern.Pattern;
import org.jaxen.pattern.PatternParser;
import org.ozoneDB.OzoneInterface;
import org.ozoneDB.OzoneObject;

import java.util.ArrayList;

/** <p><code>XPathPatternImpl</code> is an implementation of Pattern
 * which uses an XPath xpath.</p>
 *
 * @author <a href="mailto:[e-mail]">James Strachan</a>
 * @author Per Nyfelt
 * @version $Revision: 1.2 $
 */
public class XPathPatternImpl extends OzoneObject implements XPathPattern {

    final static long serialVersionUID = 1L;

    private String text;
    private Pattern pattern;
    private Context context;

    public static XPathPattern create(OzoneInterface db, Pattern pattern) {
        final Class[] signature = new Class[] {Pattern.class};
        return (XPathPattern) db.createObject(XPathPatternImpl.class,
                signature,
                new Object[]{pattern}
        );

    }

    public XPathPatternImpl(Pattern pattern) {
        this.pattern = pattern;
        this.text = pattern.getText();
        this.context = new Context(getContextSupport());
    }

    public static XPathPattern create(OzoneInterface db, String text) {
        final Class[] signature = new Class[] {String.class};
        return (XPathPattern) db.createObject(XPathPatternImpl.class,
                signature,
                new Object[]{text}
        );

    }

    public XPathPatternImpl(String text) {
        this.text = text;
        this.context = new Context(getContextSupport());
        try {
            this.pattern = PatternParser.parse(text);
        } catch (Exception e) {
            throw new InvalidXPathException(text, e.getMessage());
        }
    }

    public boolean matches(Node node) {
        try {
            ArrayList list = new ArrayList(1);
            list.add(node);
            context.setNodeSet(list);
            return pattern.matches(node, context);
        } catch (JaxenException e) {
            handleJaxenException(e);
            return false;
        }
    }

    public String getText() {
        return text;
    }


    public double getPriority() {
        return pattern.getPriority();
    }

    public org.dom4j.rule.Pattern[] getUnionPatterns() {
        Pattern[] patterns = pattern.getUnionPatterns();
        if (patterns != null) {
            int size = patterns.length;
            XPathPattern[] answer = new XPathPattern[size];
            for (int i = 0; i < size; i++) {
                answer[i] = create(database(), patterns[i]);
            }
            return answer;
        }
        return null;
    }

    public short getMatchType() {
        return pattern.getMatchType();
    }

    public String getMatchesNodeName() {
        return pattern.getMatchesNodeName();
    }

    public void setVariableContext(VariableContext variableContext) {
        context.getContextSupport().setVariableContext(variableContext);
    }


    public String toString() {
        return "[XPathPatternImpl: text: " + text + " Pattern: " + pattern + "]";
    }

    protected ContextSupport getContextSupport() {
        return new ContextSupport(
                new SimpleNamespaceContext(),
                XPathFunctionContext.getInstance(),
                new SimpleVariableContext(),
                DocumentNavigator.getInstance()
        );
    }

    protected void handleJaxenException(JaxenException e) throws XPathException {
        throw new XPathException(text, e);
    }
}


/*
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "DOM4J" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of MetaStuff, Ltd.  For written permission,
 *    please contact [e-mail].
 *
 * 4. Products derived from this Software may not be called "DOM4J"
 *    nor may "DOM4J" appear in their names without prior written
 *    permission of MetaStuff, Ltd. DOM4J is a registered
 *    trademark of MetaStuff, Ltd.
 *
 * 5. Due credit should be given to the DOM4J Project
 *    (http://dom4j.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY METASTUFF, LTD. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * METASTUFF, LTD. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 2001 (C) MetaStuff, Ltd. All Rights Reserved.
 *
 * $Id: XPathPatternImpl.java,v 1.2 2003/11/02 18:10:04 per_nyfelt Exp $
 */