/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

/**
 * @author Alexei Y. Zakharov
 */

package org.apache.harmony.jndi.provider.dns;

import java.util.Hashtable;

import javax.naming.Context;
import javax.naming.Name;
import javax.naming.NamingException;
import javax.naming.spi.ObjectFactory;

import org.apache.harmony.jndi.internal.nls.Messages;

/**
 * Factory to create DNS URL contexts.
 */
public class dnsURLContextFactory implements ObjectFactory {

    /**
     * Returns new instance of DNS URL context.
     * 
     * @param obj
     *            either <code>null</code>, URL in string form or array of
     *            URL in string form
     * @param name
     *            ignored
     * @param nameCtx
     *            ignored
     * @param environment
     *            is passed to the context being created
     * @return created DNS context, an instance of either
     *         <code>dnsURLContext</code> or <code>DNSContext</code> class
     * @throws IllegalArgumentException
     *             if bad <code>obj</code> is given
     * @throws NamingException
     *             if such exception was encountered
     * @see ObjectFactory#getObjectInstance(Object, Name, Context, Hashtable)
     */
    @SuppressWarnings("unchecked")
    public Object getObjectInstance(Object obj, Name name, Context nameCtx,
            Hashtable<?, ?> environment) throws NamingException {
        if (obj == null) {
            return new dnsURLContext(environment);
        } else if (obj instanceof String) {
            Hashtable<Object, Object> newEnv = (Hashtable<Object, Object>) environment
                    .clone();

            newEnv.put(Context.PROVIDER_URL, obj);
            return new DNSContext(newEnv);
        } else if (obj instanceof String[]) {
            Hashtable<Object, Object> newEnv = (Hashtable<Object, Object>) environment
                    .clone();
            StringBuilder sb = new StringBuilder();
            String urlArr[] = (String[]) obj;

            for (int i = 0; i < urlArr.length; i++) {
                if (i != 0) {
                    sb.append(' ');
                }
                sb.append(urlArr[i]);
            }
            newEnv.put(Context.PROVIDER_URL, sb.toString());
            return new DNSContext(newEnv);
        } else {
            // jndi.65=obj should be either null, String or array of String
            throw new IllegalArgumentException(Messages.getString("jndi.65")); //$NON-NLS-1$
        }
    }

}