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/*
 * Fabric3
 * Copyright (c) 2009-2013 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
 * you are not obligated to do so. If you do not wish to do so,
 * 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.channel;

import org.fabric3.spi.channel.EventStream;
import org.fabric3.spi.channel.EventStreamHandler;
import org.fabric3.spi.channel.PassThroughHandler;
import org.fabric3.spi.model.physical.PhysicalEventStreamDefinition;

/**
 *
 */
public class EventStreamImpl implements EventStream {
    private PhysicalEventStreamDefinition definition;
    private EventStreamHandler headHandler;
    private EventStreamHandler tailHandler;

    public EventStreamImpl(PhysicalEventStreamDefinition definition) {
        this.definition = definition;
        PassThroughHandler handler = new PassThroughHandler();
        addHandler(handler);
    }

    public PhysicalEventStreamDefinition getDefinition() {
        return definition;
    }

    public EventStreamHandler getHeadHandler() {
        return headHandler;
    }

    public EventStreamHandler getTailHandler() {
        return tailHandler;
    }

    public void addHandler(EventStreamHandler handler) {
        if (headHandler == null) {
            headHandler = handler;
        } else {
            tailHandler.setNext(handler);
        }
        tailHandler = handler;
    }

    public void addHandler(int index, EventStreamHandler handler) {
        int i = 0;
        EventStreamHandler next = headHandler;
        EventStreamHandler prev = null;
        while (next != null && i < index) {
            prev = next;
            next = next.getNext();
            i++;
        }
        if (i == index) {
            if (prev != null) {
                prev.setNext(handler);
            } else {
                headHandler = handler;
            }
            handler.setNext(next);
            if (next == null) {
                tailHandler = handler;
            }
        } else {
            throw new ArrayIndexOutOfBoundsException(index);
        }
    }

}