/*

 * 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

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package com.sun.org.apache.xml.internal.security.utils;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import javax.xml.namespace.NamespaceContext;

import org.w3c.dom.Attr;

import org.w3c.dom.Element;

import org.w3c.dom.NamedNodeMap;

import org.w3c.dom.Node;

/**

 */

public class DOMNamespaceContext implements NamespaceContext {

    private Map<String, String> namespaceMap = new HashMap<>();

    public DOMNamespaceContext(Node contextNode) {

        addNamespaces(contextNode);

    }

    public String getNamespaceURI(String arg0) {

        return namespaceMap.get(arg0);

    }

    public String getPrefix(String arg0) {

        for (Entry<String, String> entry : namespaceMap.entrySet()) {

            if (entry.getValue().equals(arg0)) {

                return entry.getKey();

            }

        }

        return null;

    }

    public Iterator<String> getPrefixes(String arg0) {

        return namespaceMap.keySet().iterator();

    }

    private void addNamespaces(Node element) {

        if (element.getParentNode() != null) {

            addNamespaces(element.getParentNode());

        }

        if (element instanceof Element) {

            Element el = (Element)element;

            NamedNodeMap map = el.getAttributes();

            for (int x = 0; x < map.getLength(); x++) {

                Attr attr = (Attr)map.item(x);

                if ("xmlns".equals(attr.getPrefix())) {

                    namespaceMap.put(attr.getLocalName(), attr.getValue());

                }

            }

        }

    }

}