DocumentNodeTest.java

package client.net.sf.saxon.ce.pattern;
import client.net.sf.saxon.ce.om.Axis;
import client.net.sf.saxon.ce.tree.iter.AxisIterator;
import client.net.sf.saxon.ce.om.NodeInfo;
import client.net.sf.saxon.ce.om.NamePool;
import client.net.sf.saxon.ce.type.Type;

/**
  * A DocumentNodeTest implements the test document-node(element(~,~))
  */

// This is messy because the standard interface for a NodeTest does not allow
// any navigation from the node in question - it only tests for the node kind,
// node name, and type annotation of the node.

public class DocumentNodeTest extends NodeTest {


	private NodeTest elementTest;

	public DocumentNodeTest(NodeTest elementTest) {
        this.elementTest = elementTest;
	}

    /**
    * Test whether this node test is satisfied by a given node
    * @param nodeKind The type of node to be matched
     * @param fingerprint identifies the expanded name of the node to be matched
     */

    public boolean matches(int nodeKind, int fingerprint, int annotation) {
        throw new UnsupportedOperationException("DocumentNodeTest doesn't support this method");
    }

    /**
    * Determine whether this Pattern matches the given Node.
    * @param node The NodeInfo representing the Element or other node to be tested against the Pattern
    * uses variables, or contains calls on functions such as document() or key().
    * @return true if the node matches the Pattern, false otherwise
    */

    public boolean matches(NodeInfo node) {
        if (node.getNodeKind() != Type.DOCUMENT) {
            return false;
        }
        AxisIterator iter = node.iterateAxis(Axis.CHILD);
        // The match is true if there is exactly one element node child, no text node
        // children, and the element node matches the element test.
        boolean found = false;
        while (true) {
            NodeInfo n = (NodeInfo)iter.next();
            if (n==null) {
                return found;
            }
            int kind = n.getNodeKind();
            if (kind==Type.TEXT) {
                return false;
            } else if (kind==Type.ELEMENT) {
                if (found) {
                    return false;
                }
                if (elementTest.matches(n)) {
                    found = true;
                } else {
                    return false;
                }
            }
        }
    }

    /**
    * Determine the default priority of this node test when used on its own as a Pattern
    */

    public final double getDefaultPriority() {
    	return elementTest.getDefaultPriority();
    }

    /**
    * Determine the types of nodes to which this pattern applies. Used for optimisation.
    * @return the type of node matched by this pattern. e.g. Type.ELEMENT or Type.TEXT
    */

    public int getPrimitiveType() {
        return Type.DOCUMENT;
    }

    /**
     * Get a mask indicating which kinds of nodes this NodeTest can match. This is a combination
     * of bits: 1<<Type.ELEMENT for element nodes, 1<<Type.TEXT for text nodes, and so on.
     */

    public int getNodeKindMask() {
        return 1<<Type.DOCUMENT;
    }

    /**
     * Get the element test contained within this document test
     * @return the contained element test
     */

    public NodeTest getElementTest() {
        return elementTest;
    }

    public String toString(NamePool pool) {
        return "document-node(" + elementTest.toString(pool) + ')';
    }

    public String toString() {
        return "document-node(" + elementTest.toString() + ')';
    }

    /**
      * Returns a hash code value for the object.
      */

     public int hashCode() {
         return elementTest.hashCode()^12345;
     }

     public boolean equals(Object other) {
         return other instanceof DocumentNodeTest &&
                 ((DocumentNodeTest)other).elementTest.equals(elementTest);
     }

}

// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0. 
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.