/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
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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
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/**
 * 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, 2014, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * $Id: ApacheNodeSetData.java 1203890 2011-11-18 22:47:56Z 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;
    }
}