PrecedingEnumeration.java

package client.net.sf.saxon.ce.tree.linked;
import client.net.sf.saxon.ce.om.SequenceIterator;
import client.net.sf.saxon.ce.pattern.NodeTest;

final class PrecedingEnumeration extends TreeEnumeration {

    NodeImpl nextAncestor;
    
    public PrecedingEnumeration(NodeImpl node, NodeTest nodeTest) {
        super(node, nodeTest);

        // we need to avoid returning ancestors of the starting node
        nextAncestor = (NodeImpl)node.getParent();
        advance();   
    }


    /**
    * Special code to skip the ancestors of the start node
    */

    protected boolean conforms(NodeImpl node) {
        // ASSERT: we'll never test the root node, because it's always
        // an ancestor, so nextAncestor will never be null.
        if (node!=null) {
            if (node.isSameNodeInfo(nextAncestor)) {
                nextAncestor = (NodeImpl)nextAncestor.getParent();
                return false;
            }
        }
        return super.conforms(node);
    }

    protected void step() {
        next = next.getPreviousInDocument();
    }

    /**
    * Get another enumeration of the same nodes
    */
    
    public SequenceIterator getAnother() {
        return new PrecedingEnumeration(start, nodeTest);
    }

}




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// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.