nodetypetest.java

XML的解析、编译、查询等技术的JAVA源代码。

/*
 * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/pattern/NodeTypeTest.java,v 1.8 2006/02/05 21:47:42 elharo Exp $
 * $Revision: 1.8 $
 * $Date: 2006/02/05 21:47:42 $
 *
 * ====================================================================
 *
 * Copyright 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 
 *   * 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.
 * 
 *   * Neither the name of the Jaxen Project nor the names of its
 *     contributors may be used to endorse or promote products derived 
 *     from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS 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 THE COPYRIGHT OWNER
 * OR 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.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter <[e-mail]> and 
 * James Strachan <[e-mail]>.  For more information on the 
 * Jaxen Project, please see <http://www.jaxen.org/>.
 * 
 * $Id: NodeTypeTest.java,v 1.8 2006/02/05 21:47:42 elharo Exp $
 */

package org.jaxen.pattern;

import org.jaxen.Context;

/** <p><code>NodeTypeTest</code> matches if the node is of a certain type 
  * such as element, attribute, comment, text, processing instruction and so forth.</p>
  *
  * @author <a href="mailto:[e-mail]">James Strachan</a>
  * @version $Revision: 1.8 $
  */
public class NodeTypeTest extends NodeTest {
    
    public static final NodeTypeTest DOCUMENT_TEST 
        = new NodeTypeTest( DOCUMENT_NODE );
    
    public static final NodeTypeTest ELEMENT_TEST 
        = new NodeTypeTest( ELEMENT_NODE );
    
    public static final NodeTypeTest ATTRIBUTE_TEST 
        = new NodeTypeTest( ATTRIBUTE_NODE );
    
    public static final NodeTypeTest COMMENT_TEST 
        = new NodeTypeTest( COMMENT_NODE );
    
    public static final NodeTypeTest TEXT_TEST 
        = new NodeTypeTest( TEXT_NODE );
    
    public static final NodeTypeTest PROCESSING_INSTRUCTION_TEST 
        = new NodeTypeTest( PROCESSING_INSTRUCTION_NODE );
    
    public static final NodeTypeTest NAMESPACE_TEST 
        = new NodeTypeTest( NAMESPACE_NODE );
    
    
    private short nodeType;
    
    public NodeTypeTest(short nodeType)   
    {
        this.nodeType = nodeType;
    }
        
    /** @return true if the pattern matches the given node
      */
    public boolean matches( Object node, Context context ) 
    {
        return nodeType == context.getNavigator().getNodeType( node );
    }
    
    public double getPriority() 
    {
        return -0.5;
    }


    public short getMatchType() 
    {
        return nodeType;
    }
    
    public String getText() 
    {
        switch (nodeType) 
        {
            case ELEMENT_NODE:
                return "child()";
            case ATTRIBUTE_NODE:
                return "@*";
            case NAMESPACE_NODE:
                return "namespace()";
            case DOCUMENT_NODE:
                return "/";
            case COMMENT_NODE:
                return "comment()";
            case TEXT_NODE:
                return "text()";
            case PROCESSING_INSTRUCTION_NODE:
                return "processing-instruction()";
        }
        return "";
    }
    
    public String toString()
    {
        return super.toString() + "[ type: " + nodeType + " ]";
    }
}