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XMLUnit 1.x Compatibility Layer
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/*
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      of its contributors may be used to endorse or promote products
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      permission.

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package org.custommonkey.xmlunit.jaxp13;

import org.custommonkey.xmlunit.NamespaceContext;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;
import javax.xml.XMLConstants;

/**
 * Adapts {@link NamespaceContext XMLUnit's NamespaceContext} to
 * {@link javax.xml.namespace.NamespaceContext JAXP 1.3's
 * NamespaceContext}.
 */
public class XMLUnitNamespaceContext2Jaxp13
    implements javax.xml.namespace.NamespaceContext {

    private final Map nsMap;

    /**
     * Creates an adapter.
     * @param ctx the context to adapt
     */
    public XMLUnitNamespaceContext2Jaxp13(NamespaceContext ctx) {
        nsMap = turnIntoMap(ctx);
    }

    @Override
    public String getNamespaceURI(String prefix) {
        if (prefix == null) {
            throw new IllegalArgumentException("prefix must not be null");
        }
        String uri = nsMap.get(prefix);
        if (uri == null) {
            uri = XMLConstants.NULL_NS_URI;
        }
        return uri;
    }

    @Override
    public Iterator getPrefixes(String uri) {
        if (uri == null) {
            throw new IllegalArgumentException("uri must not be null");
        }

        // ensure that the empty string comes out first when asked for
        // the default namespace URI's prefix
        Set ts = new TreeSet();
        for (Map.Entry entry : nsMap.entrySet()) {
            if (uri.equals(entry.getValue())) {
                ts.add(entry.getKey());
            }
        }
        return ts.iterator();
    }

    @Override
    public String getPrefix(String uri) {
        Iterator i = getPrefixes(uri);
        return i.hasNext() ? (String) i.next() : null;
    }

    static Map turnIntoMap(NamespaceContext ctx) {
        Map m = new HashMap();
        for (Iterator i = ctx.getPrefixes(); i.hasNext(); ) {
            String prefix = (String) i.next();
            String uri = ctx.getNamespaceURI(prefix);
            // according to the Javadocs only the constants defined in
            // XMLConstants are allowed as prefixes for the following
            // two URIs
            if (!XMLConstants.XML_NS_URI.equals(uri)
                && !XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(uri)) {
                m.put(prefix, uri);
            }
        }
        m.put(XMLConstants.XML_NS_PREFIX, XMLConstants.XML_NS_URI);
        m.put(XMLConstants.XMLNS_ATTRIBUTE,
              XMLConstants.XMLNS_ATTRIBUTE_NS_URI);
        return m;
    }
}