package org.pdf4j.saxon.dom;
import org.pdf4j.saxon.om.Item;
import org.pdf4j.saxon.om.NodeInfo;
import org.pdf4j.saxon.om.SequenceIterator;
import org.pdf4j.saxon.om.VirtualNode;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.value.SequenceExtent;
import org.w3c.dom.Node;
import java.util.ArrayList;
import java.util.List;
/**
* This class wraps a list of nodes as a DOM NodeList
*/
public final class DOMNodeList implements org.w3c.dom.NodeList {
private List sequence;
/**
* Construct an node list that wraps a supplied SequenceExtent. This constructor does
* not check that the items in the supplied SequenceExtent are indeed DOM Nodes.
*/
public DOMNodeList(List extent) {
sequence = extent;
}
/**
* Construct an node list that wraps a supplied SequenceExtent, checking that all the
* items in the sequence are wrappers around DOM Nodes
*/
public static DOMNodeList checkAndMake(SequenceExtent extent) throws XPathException {
SequenceIterator it = extent.iterate();
List list = new ArrayList(extent.getLength());
while (true) {
Item next = it.next();
if (next==null) break;
Object o = next;
if (!(o instanceof NodeInfo)) {
throw new XPathException("Supplied sequence contains an item that is not a Saxon NodeInfo");
}
if (o instanceof VirtualNode) {
o = ((VirtualNode)o).getUnderlyingNode();
if (!(o instanceof Node)) {
throw new XPathException("Supplied sequence contains an item that is not a wrapper around a DOM Node");
}
list.add(o);
}
}
return new DOMNodeList(list);
}
/**
* return the number of nodes in the list (DOM method)
*/
public int getLength() {
return sequence.size();
}
/**
* Return the n'th item in the list (DOM method)
* @return the n'th node in the node list, counting from zero; or null if the index is out of range
* @throws java.lang.ClassCastException if the item is not a DOM Node
*/
public Node item(int index) {
if (index < 0 || index >= sequence.size()) {
return null;
} else {
return (Node)sequence.get(index);
}
}
}
//
// 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.
//