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package se.l4.commons.serialization.internal;

import java.io.IOException;
import java.lang.annotation.Annotation;

import se.l4.commons.serialization.Serializer;
import se.l4.commons.serialization.SerializerCollection;
import se.l4.commons.serialization.SerializerFormatDefinition;
import se.l4.commons.serialization.format.StreamingInput;
import se.l4.commons.serialization.format.StreamingOutput;
import se.l4.commons.serialization.spi.Type;

/**
 * Serializer that is delayed in that it will not be assigned until the entire
 * serializer chain is resolved. Used to solve recursive serialization.
 * 
 * @author Andreas Holstenson
 *
 * @param 
 */
public class DelayedSerializer
	implements Serializer
{
	private final SerializerCollection collection;
	private final Type type;
	private final Annotation[] hints;
	
	private volatile Serializer instance;
	
	public DelayedSerializer(SerializerCollection collection, Type type, Annotation[] hints)
	{
		this.collection = collection;
		this.type = type;
		this.hints = hints;
	}
	
	@SuppressWarnings("unchecked")
	private void ensureSerializer()
	{
		if(instance == null)
		{
			instance = (Serializer) collection.find(type, hints);
			if(instance instanceof DelayedSerializer)
			{
				instance = null;
			}
		}
	}
	
	@Override
	public T read(StreamingInput in) throws IOException
	{
		ensureSerializer();
		
		return instance.read(in);
	}
	
	
	@Override
	public void write(T object, String name, StreamingOutput stream)
		throws IOException
	{
		ensureSerializer();
		
		instance.write(object, name, stream);
	}
	
	@Override
	public SerializerFormatDefinition getFormatDefinition()
	{
		ensureSerializer();
		
		if(instance == null) return null;
		
		return instance.getFormatDefinition();
	}
}