/**
 * Copyright 2007-2016, Kaazing Corporation. All rights reserved.
 *
 * 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.kaazing.gateway.resource.address.udp;

import static java.lang.String.format;

import java.net.InetAddress;
import java.net.URI;
import java.net.UnknownHostException;

// TODO: remove this and detect multicast automatically in UDP acceptor / connector
public class McpResourceAddressFactorySpi extends UdpResourceAddressFactorySpi {
    
    public static final String SCHEME_NAME = "mcp";

    @Override
    public String getSchemeName() {
        return SCHEME_NAME;
    }
    
    @Override
    protected UdpResourceAddress newResourceAddress0(String original, String location) {
        
        UdpResourceAddress address = super.newResourceAddress0(original, location);
        URI resource = address.getResource();
        String host = resource.getHost();
        try {
            InetAddress hostAddress = InetAddress.getByName(host);
            if (!hostAddress.isMulticastAddress()) {
                throw new IllegalArgumentException(format("Expected multicast address in URI: %s", location));
            }
        }
        catch (UnknownHostException e) {
            throw new IllegalArgumentException(format("Unable to resolve DNS name: %s", host), e);
        }
        
        return address;
    }
    
}