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package org.craft.atom.io;

import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.atomic.AtomicLong;

import lombok.EqualsAndHashCode;
import lombok.Getter;
import lombok.ToString;

/**
 * Base implementation class for common concept of channel.
 * 
 * @author mindwind
 * @version 1.0, Feb 21, 2013
 */
@EqualsAndHashCode(of = "id")
@ToString(of = { "id", "state" })
abstract public class AbstractChannel {
	
	
	private static final AtomicLong ID_GENERATOR = new AtomicLong(0);
	
	
	@Getter protected long                  id                                                  ;
	        protected Map   attributes = new ConcurrentHashMap();
	        protected volatile ChannelState state      = ChannelState.OPEN                      ;
	
	
	// ~ -----------------------------------------------------------------------------------------------------------
	
	
	public AbstractChannel() {
		id = ID_GENERATOR.incrementAndGet();
	}
	
	public AbstractChannel(long id) {
		this.id = id;
	}

	
	// ~ -----------------------------------------------------------------------------------------------------------
	
	
	public boolean isOpen() {
		return state == ChannelState.OPEN;
	}
	
	public boolean isClosing() {
		return state == ChannelState.CLOSING;
	}
	
	public boolean isClosed() {
		return state == ChannelState.CLOSED;
	}
	
	public boolean isPaused() {
		return state == ChannelState.PAUSED;
	}
	
	public void pause() {
		state = ChannelState.PAUSED;
	}
	
	public void resume() {
		state = ChannelState.OPEN;
	}
	
	public void close() {
		state = ChannelState.CLOSED;
	}
	
	public Object getAttribute(Object key) {
		if (key == null) {
            throw new IllegalArgumentException("key can not be null");
        }

        return attributes.get(key);
	}
	
	public Object setAttribute(Object key, Object value) {
		if (key == null || value == null) {
			throw new IllegalArgumentException("key & value can not be null");
        }
        
        return attributes.put(key, value);
	}
	
	public boolean containsAttribute(Object key) {
		if (key == null) {
            throw new IllegalArgumentException("key can not be null");
        }
		
		return attributes.containsKey(key);
	}
	
	public Object removeAttribute(Object key) {
		if (key == null) {
            throw new IllegalArgumentException("key can not be null");
        }
		
		return attributes.remove(key);
	}
	
}