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package org.opengis.cite.ogcapitiles10.util;

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

import org.opengis.cite.ogcapitiles10.Namespaces;

/**
 * Provides namespace bindings for evaluating XPath 1.0 expressions using the JAXP XPath
 * API. A namespace name (URI) may be bound to only one prefix.
 */
public class NamespaceBindings implements NamespaceContext {

	private Map bindings = new HashMap();

	@Override
	public String getNamespaceURI(String prefix) {
		String nsName = null;
		for (Map.Entry binding : bindings.entrySet()) {
			if (binding.getValue().equals(prefix)) {
				nsName = binding.getKey();
				break;
			}
		}
		return nsName;
	}

	@Override
	public String getPrefix(String namespaceURI) {
		return bindings.get(namespaceURI);
	}

	@Override
	public Iterator getPrefixes(String namespaceURI) {
		return Arrays.asList(getPrefix(namespaceURI)).iterator();
	}

	/**
	 * Adds a namespace binding that associates a namespace name with a prefix. If a
	 * binding for a given namespace name already exists it will be replaced.
	 * @param namespaceURI A String denoting a namespace name (an absolute URI value).
	 * @param prefix A prefix associated with the namespace name.
	 */
	public void addNamespaceBinding(String namespaceURI, String prefix) {
		bindings.put(namespaceURI, prefix);
	}

	/**
	 * Adds all of the supplied namespace bindings to the existing set of entries.
	 * @param nsBindings A Map containing a collection of namespace bindings where the key
	 * is an absolute URI specifying the namespace name and the value denotes the
	 * associated prefix.
	 */
	public void addAllBindings(Map nsBindings) {
		if (null != nsBindings)
			bindings.putAll(nsBindings);
	}

	/**
	 * Returns an unmodifiable view of the declared namespace bindings.
	 * @return An immutable Map containing zero or more namespace bindings where the key
	 * is an absolute URI specifying the namespace name and the value is the associated
	 * prefix.
	 */
	public Map getAllBindings() {
		return Collections.unmodifiableMap(this.bindings);
	}

	/**
	 * Creates a NamespaceBindings object that declares the following namespace bindings:
	 *
	 * 
	 * ows: {@value org.opengis.cite.ogcapitiles10.Namespaces#OWS}
	 * xlink: {@value org.opengis.cite.ogcapitiles10.Namespaces#XLINK}
	 * gml: {@value org.opengis.cite.ogcapitiles10.Namespaces#GML}
	 * 
	 * @return A NamespaceBindings object.
	 */
	public static NamespaceBindings withStandardBindings() {
		NamespaceBindings nsBindings = new NamespaceBindings();
		nsBindings.addNamespaceBinding(Namespaces.OWS, "ows");
		nsBindings.addNamespaceBinding(Namespaces.XLINK, "xlink");
		nsBindings.addNamespaceBinding(Namespaces.GML, "gml");
		return nsBindings;
	}

	@Override
	public String toString() {
		return "NamespaceBindings:\n" + bindings;
	}

}