/**
 *
 * Copyright the original author or authors
 *
 * Licensed 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 under the License.
 */
package org.jivesoftware.smackx.pubsub.packet;

import java.util.Locale;

/**
 * Defines all the valid namespaces that are used with the {@link PubSub} packet
 * as defined by the specification.
 * 
 * @author Robin Collier
 */
public enum PubSubNamespace
{
    BASIC(null),
    ERROR("errors"),
    EVENT("event"),
    OWNER("owner");

    private final String fragment;
    private final String fullNamespace;

    private PubSubNamespace(String fragment)
    {
        this.fragment = fragment;
        if (fragment != null) {
            fullNamespace = PubSub.NAMESPACE + '#' + fragment;
        }
        else {
            fullNamespace = PubSub.NAMESPACE;
        }
    }

    public String getXmlns()
    {
        return fullNamespace;
    }

    public String getFragment()
    {
        return fragment;
    }

    public static PubSubNamespace valueOfFromXmlns(String ns)
    {
        int index = ns.lastIndexOf('#');

        if (index != -1)
        {
            String suffix = ns.substring(ns.lastIndexOf('#') + 1);
            return valueOf(suffix.toUpperCase(Locale.US));
        }
        else
            return BASIC;
    }
}
