package org.bukkit.util.io;

import org.bukkit.configuration.serialization.ConfigurationSerializable;
import org.bukkit.configuration.serialization.ConfigurationSerialization;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;

/**
 * This class is designed to be used in conjunction with the {@link
 * ConfigurationSerializable} API. It translates objects back to their
 * original implementation after being serialized by {@link
 * BukkitObjectInputStream}.
 * <p>
 * Behavior of implementations extending this class is not guaranteed across
 * future versions.
 */
public class BukkitObjectInputStream extends ObjectInputStream
{

	/**
	 * Constructor provided to mirror super functionality.
	 *
	 * @throws IOException
	 * @throws SecurityException
	 * @see ObjectInputStream#ObjectInputStream()
	 */
	protected BukkitObjectInputStream() throws IOException, SecurityException
	{
		super();
		super.enableResolveObject(true);
	}

	/**
	 * Object input stream decoration constructor.
	 *
	 * @param in
	 * @throws IOException
	 * @see ObjectInputStream#ObjectInputStream(InputStream)
	 */
	public BukkitObjectInputStream(InputStream in) throws IOException
	{
		super(in);
		super.enableResolveObject(true);
	}

	@Override
	protected Object resolveObject(Object obj) throws IOException
	{
		if(obj instanceof Wrapper)
		{
			try
			{
				(obj = ConfigurationSerialization.deserializeObject(((Wrapper<?>) obj).map)).getClass(); // NPE
			} catch(Throwable ex)
			{
				throw newIOException("Failed to deserialize object", ex);
			}
		}

		return super.resolveObject(obj);
	}

	private static IOException newIOException(String string, Throwable cause)
	{
		IOException exception = new IOException(string);
		exception.initCause(cause);
		return exception;
	}
}