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/*
 * Fabric3
 * Copyright (c) 2009-2011 Metaform Systems
 *
 * Fabric3 is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as
 * published by the Free Software Foundation, either version 3 of
 * the License, or (at your option) any later version, with the
 * following exception:
 *
 * Linking this software statically or dynamically with other
 * modules is making a combined work based on this software.
 * Thus, the terms and conditions of the GNU General Public
 * License cover the whole combination.
 *
 * As a special exception, the copyright holders of this software
 * give you permission to link this software with independent
 * modules to produce an executable, regardless of the license
 * terms of these independent modules, and to copy and distribute
 * the resulting executable under terms of your choice, provided
 * that you also meet, for each linked independent module, the
 * terms and conditions of the license of that module. An
 * independent module is a module which is not derived from or
 * based on this software. If you modify this software, you may
 * extend this exception to your version of the software, but
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 * delete this exception statement from your version.
 *
 * Fabric3 is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 *
 * You should have received a copy of the
 * GNU General Public License along with Fabric3.
 * If not, see .
*/
package org.fabric3.fabric.builder.channel;

import java.net.URI;

import org.osoa.sca.annotations.EagerInit;
import org.osoa.sca.annotations.Reference;

import org.fabric3.fabric.model.physical.ChannelTargetDefinition;
import org.fabric3.spi.builder.component.ConnectionAttachException;
import org.fabric3.spi.builder.component.TargetConnectionAttacher;
import org.fabric3.spi.channel.Channel;
import org.fabric3.spi.channel.ChannelConnection;
import org.fabric3.spi.channel.ChannelManager;
import org.fabric3.spi.model.physical.PhysicalConnectionSourceDefinition;

/**
 * Attaches the target side of a channel connection to a channel.
 *
 * @version $Rev: 10114 $ $Date: 2011-03-22 21:51:00 +0000 (Tue, 22 Mar 2011) $
 */
@EagerInit
public class ChannelTargetAttacher implements TargetConnectionAttacher {
    private ChannelManager channelManager;

    public ChannelTargetAttacher(@Reference ChannelManager channelManager) {
        this.channelManager = channelManager;
    }

    public void attach(PhysicalConnectionSourceDefinition source, ChannelTargetDefinition target, ChannelConnection connection)
            throws ConnectionAttachException {
        URI uri = target.getTargetUri();
        Channel channel = getChannel(uri);
        channel.attach(connection);
    }

    public void detach(PhysicalConnectionSourceDefinition source, ChannelTargetDefinition target) throws ConnectionAttachException {
        // no-op since channel do not maintain references to incoming handlers
    }

    private Channel getChannel(URI uri) throws ChannelNotFoundException {
        Channel channel = channelManager.getChannel(uri);
        if (channel == null) {
            throw new ChannelNotFoundException("Channel not found");
        }
        return channel;
    }

}