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package se.l4.commons.serialization.collections;

import java.io.IOException;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

import se.l4.commons.serialization.Serializer;
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.format.Token;

/**
 * Serializer for arrays.
 * 
 * @author Andreas Holstenson
 *
 */
public class ArraySerializer
	implements Serializer
{
	private final Class componentType;
	@SuppressWarnings("rawtypes")
	private final Serializer itemSerializer;
	private final SerializerFormatDefinition formatDefinition;

	public ArraySerializer(Class componentType, Serializer itemSerializer)
	{
		this.componentType = componentType;
		this.itemSerializer = itemSerializer;
		
		formatDefinition = SerializerFormatDefinition.builder()
			.list(itemSerializer)
			.build();
	}
	
	@Override
	public Object read(StreamingInput in)
		throws IOException
	{
		in.next(Token.LIST_START);
		
		List list = new ArrayList<>();
		while(in.peek() != Token.LIST_END)
		{
			if(in.peek() == Token.NULL)
			{
				in.next(Token.NULL);
				list.add(null);
			}
			else
			{
				Object value = itemSerializer.read(in);
				list.add(value);
			}
		}
		
		in.next(Token.LIST_END);
		
		Object array = Array.newInstance(componentType, list.size());
		for(int i=0, n=list.size(); i