/*

 * reserved comment block

 * DO NOT REMOVE OR ALTER!

 */

/**

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements. See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership. The ASF licenses this file

 * to you under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing,

 * software distributed under the License is distributed on an

 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

 * KIND, either express or implied. See the License for the

 * specific language governing permissions and limitations

 * under the License.

 */

/*

 * Copyright (c) 2005, 2018, Oracle and/or its affiliates. All rights reserved.

 */

/*

 * $Id: ApacheNodeSetData.java 1496478 2013-06-25 14:01:16Z mullan $

 */

package org.jcp.xml.dsig.internal.dom;

import java.util.Collections;

import java.util.Iterator;

import java.util.LinkedHashSet;

import java.util.List;

import java.util.Set;

import javax.xml.crypto.NodeSetData;

import org.w3c.dom.Node;

import com.sun.org.apache.xml.internal.security.signature.NodeFilter;

import com.sun.org.apache.xml.internal.security.signature.XMLSignatureInput;

import com.sun.org.apache.xml.internal.security.utils.XMLUtils;

public class ApacheNodeSetData implements ApacheData, NodeSetData<Node> {

    private XMLSignatureInput xi;

    public ApacheNodeSetData(XMLSignatureInput xi) {

        this.xi = xi;

    }

    public Iterator<Node> iterator() {

        // If nodefilters are set, must execute them first to create node-set

        if (xi.getNodeFilters() != null && !xi.getNodeFilters().isEmpty()) {

            return Collections.unmodifiableSet

                (getNodeSet(xi.getNodeFilters())).iterator();

        }

        try {

            return Collections.unmodifiableSet(xi.getNodeSet()).iterator();

        } catch (Exception e) {

            // should not occur

            throw new RuntimeException

                ("unrecoverable error retrieving nodeset", e);

        }

    }

    public XMLSignatureInput getXMLSignatureInput() {

        return xi;

    }

    private Set<Node> getNodeSet(List<NodeFilter> nodeFilters) {

        if (xi.isNeedsToBeExpanded()) {

            XMLUtils.circumventBug2650

                (XMLUtils.getOwnerDocument(xi.getSubNode()));

        }

        Set<Node> inputSet = new LinkedHashSet<Node>();

        XMLUtils.getSet(xi.getSubNode(), inputSet,

                        null, !xi.isExcludeComments());

        Set<Node> nodeSet = new LinkedHashSet<Node>();

        for (Node currentNode : inputSet) {

            Iterator<NodeFilter> it = nodeFilters.iterator();

            boolean skipNode = false;

            while (it.hasNext() && !skipNode) {

                NodeFilter nf = it.next();

                if (nf.isNodeInclude(currentNode) != 1) {

                    skipNode = true;

                }

            }

            if (!skipNode) {

                nodeSet.add(currentNode);

            }

        }

        return nodeSet;

    }

}