net.sf.saxon.pattern.IdrefTest Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of saxon9 Show documentation

Provides a basic XSLT 2.0 and XQuery 1.0 processor (W3C Recommendations, January 2007). Command line interfaces and implementations of several Java APIs (DOM, XPath, s9api) are also included.

The newest version!

package net.sf.saxon.pattern;
import net.sf.saxon.expr.*;
import net.sf.saxon.om.*;
import net.sf.saxon.trans.XPathException;

import java.io.Serializable;

/**
 * IdrefTest is a test that cannot be represented directly in XPath or
 * XSLT patterns, but which is used internally for matching IDREF nodes: it tests
 * whether the node has the is-idref property
  *
  * @author Michael H. Kay
  */

public class IdrefTest implements PatternFinder, Serializable {

    private static IdrefTest THE_INSTANCE = new IdrefTest();

    /**
     * Get the singleton instance of this class
     */

    public static IdrefTest getInstance() {
        return THE_INSTANCE;
    }

    /**
     * Create a IdrefTest
     */

	private IdrefTest() {}

    /**
      * Select nodes in a document using this PatternFinder.
      * @param doc the document node at the root of a tree
      * @param context the dynamic evaluation context
      * @return an iterator over the selected nodes in the document.
      */

     public SequenceIterator selectNodes(DocumentInfo doc, final XPathContext context) throws XPathException {

         AxisIterator allElements = doc.iterateAxis(Axis.DESCENDANT, NodeKindTest.ELEMENT);
         MappingFunction atts = new MappingFunction() {
             public SequenceIterator map(Item item) {
                 return new PrependIterator((NodeInfo)item, ((NodeInfo)item).iterateAxis(Axis.ATTRIBUTE));
             }
         };
         SequenceIterator allAttributes = new MappingIterator(allElements, atts);
         ItemMappingFunction test = new ItemMappingFunction() {
             public Item map(Item item) {
                 if ((matches((NodeInfo)item))) {
                     return item;
                 } else {
                     return null;
                 }
             }
         };
         return new ItemMappingIterator(allAttributes, test);

     }

    /**
     * Test whether this node test is satisfied by a given node.
     * @param node the node to be matched
     */

    private boolean matches(NodeInfo node) {
        if (node instanceof ExtendedNodeInfo) {
            return ((ExtendedNodeInfo)node).isIdref();
        }
        return false;
    }


    public String toString() {
        return "is-idref()";
    }

}

//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file.
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Portions created by (your name) are Copyright (C) (your legal entity). All Rights Reserved.
//
// Contributor(s): none.
//