/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

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 */

package com.sun.org.apache.xpath.internal.jaxp;

import java.util.Iterator;

import javax.xml.xpath.XPathException;

import javax.xml.xpath.XPathNodes;

import javax.xml.xpath.XPathEvaluationResult.XPathResultType;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

/**

 * This class implements XPathNodes that represents a set of nodes selected by

 * evaluating an expression.

 */

public class XPathNodesImpl implements XPathNodes {

    Class<Node> elementType;

    NodeList nodeList = null;

    public XPathNodesImpl(NodeList nodeList, Class<Node> elementType) {

        this.nodeList = nodeList;

        this.elementType = elementType;

    }

    @Override

    public Iterator<Node> iterator() {

        return new NodeSetIterator<>(elementType);

    }

    class NodeSetIterator<E> implements Iterator<E> {

        int currentIndex;

        Class<E> elementType;

        NodeSetIterator(Class<E> elementType) {

            this.elementType = elementType;

        }

        public boolean hasNext() {

            if (nodeList != null) {

                return currentIndex < nodeList.getLength();

            }

            return false;

        }

        public E next() {

            if (nodeList != null && nodeList.getLength() > 0) {

                return elementType.cast(nodeList.item(currentIndex++));

            }

            return null;

        }

    }

    @Override

    public int size() {

        if (nodeList != null) {

            return nodeList.getLength();

        }

        return 0;

    }

    @Override

    public Node get(int index) throws XPathException {

        if (index <0 || index >= size()) {

            throw new IndexOutOfBoundsException("Index " + index + " is out of bounds");

        }

        if (nodeList != null) {

            return nodeList.item(index);

        }

        return null;

    }

}