/*
 * RegistryImpl.java
 *                ,
 * Copyright 2007 Eamonn McManus
 *
 * 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 net.mcmanus.eamonn.customregistry;

import java.rmi.AlreadyBoundException;
import java.rmi.NotBoundException;
import java.rmi.Remote;
import java.rmi.RemoteException;
import java.rmi.StubNotFoundException;
import java.rmi.registry.Registry;
import java.rmi.server.RemoteStub;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

public class RegistryImpl implements Registry {
    private ConcurrentMap<String, Remote> map =
            new ConcurrentHashMap<String, Remote>();

    public void bind(String name, Remote obj)
    throws AlreadyBoundException, RemoteException {
        nameNotNull(name);
        objNotNull(obj);
        if (map.putIfAbsent(name, obj) != null)
            throw new AlreadyBoundException(name);
    }

    public String[] list() {
        return map.keySet().toArray(new String[0]);
    }

    public Remote lookup(String name) throws NotBoundException {
        nameNotNull(name);
        Remote obj = map.get(name);
        if (obj == null)
            throw new NotBoundException(name);
        return obj;
    }

    public void rebind(String name, Remote obj) throws RemoteException {
        nameNotNull(name);
        objNotNull(obj);
        map.put(name, obj);
    }

    public void unbind(String name) throws NotBoundException {
        nameNotNull(name);
        if (map.remove(name) == null)
            throw new NotBoundException(name);
    }

    private static void nameNotNull(String name) {
        if (name == null)
            throw new NullPointerException("Name");
    }

    private static void objNotNull(Remote obj) {
        if (obj == null)
            throw new NullPointerException("Remote object");
    }
}