1/*
2 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package com.sun.org.apache.xpath.internal.jaxp;
27
28import java.util.Iterator;
29import javax.xml.xpath.XPathException;
30import javax.xml.xpath.XPathNodes;
31import javax.xml.xpath.XPathEvaluationResult.XPathResultType;
32import org.w3c.dom.Node;
33import org.w3c.dom.NodeList;
34
35/**
36 * This class implements XPathNodes that represents a set of nodes selected by
37 * evaluating an expression.
38 */
39public class XPathNodesImpl implements XPathNodes {
40    Class<Node> elementType;
41    NodeList nodeList = null;
42
43    public XPathNodesImpl(NodeList nodeList, Class<Node> elementType) {
44        this.nodeList = nodeList;
45        this.elementType = elementType;
46    }
47
48    @Override
49    public Iterator<Node> iterator() {
50        return new NodeSetIterator<>(elementType);
51    }
52
53    class NodeSetIterator<E> implements Iterator<E> {
54        int currentIndex;
55        Class<E> elementType;
56        NodeSetIterator(Class<E> elementType) {
57            this.elementType = elementType;
58        }
59        public boolean hasNext() {
60            if (nodeList != null) {
61                return currentIndex < nodeList.getLength();
62            }
63
64            return false;
65        }
66
67        public E next() {
68            if (nodeList != null && nodeList.getLength() > 0) {
69                return elementType.cast(nodeList.item(currentIndex++));
70            }
71            return null;
72        }
73    }
74
75    @Override
76    public int size() {
77        if (nodeList != null) {
78            return nodeList.getLength();
79        }
80        return 0;
81    }
82
83    @Override
84    public Node get(int index) throws XPathException {
85        if (index <0 || index >= size()) {
86            throw new IndexOutOfBoundsException("Index " + index + " is out of bounds");
87        }
88        if (nodeList != null) {
89            return nodeList.item(index);
90        }
91        return null;
92    }
93}
94