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package com.sun.jersey.json.impl.reader;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import javax.xml.namespace.NamespaceContext;

/**
 *
 * @author japod
 */
public class JsonNamespaceContext implements NamespaceContext {
    
    static final String PrefixPREFIX = "ns";

    private final Map ns2pMap = new HashMap();
    private final Map p2nsMap = new HashMap();
    private int nsCount = 0;

    protected int getNamespaceCount() {
        return nsCount;
    }

    public String getNamespaceURI(String prefix) {
        if (p2nsMap.containsKey(prefix)) {
            return p2nsMap.get(prefix);
        }
        return null;
    }

    public String getPrefix(String namespaceURI) {
        if (ns2pMap.containsKey(namespaceURI)) {
            return ns2pMap.get(namespaceURI);
        } else {
            final String newPrefix = PrefixPREFIX + ++nsCount;
            ns2pMap.put(namespaceURI, newPrefix);
            p2nsMap.put(newPrefix, namespaceURI);
            return newPrefix;
        }
    }

    public Iterator getPrefixes(String namespaceURI) {
        return p2nsMap.keySet().iterator();
    }

}