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/*
******************************************************************
Copyright (c) 2001,2015,2022 Jeff Martin, Tim Bacon
All rights reserved.

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    * Redistributions of source code must retain the above copyright
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      with the distribution.
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      of its contributors may be used to endorse or promote products
      derived from this software without specific prior written
      permission.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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*/

package org.custommonkey.xmlunit;

import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

/**
 * Implementation of NamespaceContext that's backed by a map.
 */
public class SimpleNamespaceContext implements NamespaceContext {
    /* prefix -> NS URI */
    private final Map prefixMap;

    /**
     * An empty context containing no prefixes at all.
     */
    public static final SimpleNamespaceContext EMPTY_CONTEXT =
        new SimpleNamespaceContext(Collections.emptyMap());

    /**
     * Creates a NamespaceContext backed by the given map.
     *
     * Copies the map, changes made to the given map after calling
     * the constructor are not reflected into the
     * NamespaceContext.
     *
     * @param prefixMap maps prefix to Namespace URI
     */
    public SimpleNamespaceContext(Map prefixMap) {
        this.prefixMap = new HashMap(prefixMap);
    }

    @Override
    public String getNamespaceURI(String prefix) {
        return prefixMap.get(prefix);
    }

    @Override
    public Iterator getPrefixes() {
        return prefixMap.keySet().iterator();
    }
}