plugins/com.naef.jnlua-lua52/src/com/naef/jnlua/DefaultConverter.java - ldt/org.eclipse.ldt - Git at Google

 /*
  * $Id: DefaultConverter.java 161 2012-10-06 13:53:02Z andre@naef.com $
  * See LICENSE.txt for license terms.
  */

 package com.naef.jnlua;

 import java.lang.reflect.Array;
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;

 import com.naef.jnlua.util.AbstractTableList;
 import com.naef.jnlua.util.AbstractTableMap;

 /**
  * Default implementation of the <code>Converter</code> interface.
  */
 public class DefaultConverter implements Converter {
 	// -- Static
 	/**
 	 * Raw byte array.
 	 */
 	private static final boolean RAW_BYTE_ARRAY = Boolean.parseBoolean(System
 			.getProperty(DefaultConverter.class.getPackage().getName()
 					+ ".rawByteArray"));

 	/**
 	 * Static instance.
 	 */
 	private static final DefaultConverter INSTANCE = new DefaultConverter();

 	/**
 	 * Boolean distance map.
 	 */
 	private static final Map<Class<?>, Integer> BOOLEAN_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
 	static {
 		BOOLEAN_DISTANCE_MAP.put(Boolean.class, new Integer(1));
 		BOOLEAN_DISTANCE_MAP.put(Boolean.TYPE, new Integer(1));
 		BOOLEAN_DISTANCE_MAP.put(Object.class, new Integer(2));
 	}

 	/**
 	 * Number distance map.
 	 */
 	private static final Map<Class<?>, Integer> NUMBER_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
 	static {
 		NUMBER_DISTANCE_MAP.put(Byte.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Byte.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Short.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Short.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Integer.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Integer.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Long.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Long.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Float.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Float.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Double.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Double.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(BigInteger.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(BigDecimal.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Character.class, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Character.TYPE, new Integer(1));
 		NUMBER_DISTANCE_MAP.put(Object.class, new Integer(2));
 		NUMBER_DISTANCE_MAP.put(String.class, new Integer(3));
 		if (!RAW_BYTE_ARRAY) {
 			NUMBER_DISTANCE_MAP.put(byte[].class, new Integer(3));
 		}
 	}

 	/**
 	 * String distance map.
 	 */
 	private static final Map<Class<?>, Integer> STRING_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
 	static {
 		STRING_DISTANCE_MAP.put(String.class, new Integer(1));
 		if (!RAW_BYTE_ARRAY) {
 			STRING_DISTANCE_MAP.put(byte[].class, new Integer(1));
 		}
 		STRING_DISTANCE_MAP.put(Object.class, new Integer(2));
 		STRING_DISTANCE_MAP.put(Byte.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Byte.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(Short.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Short.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(Integer.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Integer.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(Long.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Long.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(Float.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Float.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(Double.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Double.TYPE, new Integer(3));
 		STRING_DISTANCE_MAP.put(BigInteger.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(BigDecimal.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Character.class, new Integer(3));
 		STRING_DISTANCE_MAP.put(Character.TYPE, new Integer(3));
 	}

 	/**
 	 * Function distance map.
 	 */
 	private static final Map<Class<?>, Integer> FUNCTION_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
 	static {
 		FUNCTION_DISTANCE_MAP.put(JavaFunction.class, new Integer(1));
 		FUNCTION_DISTANCE_MAP.put(Object.class, new Integer(2));
 	}

 	/**
 	 * Lua value converters.
 	 */
 	private static final Map<Class<?>, LuaValueConverter<?>> LUA_VALUE_CONVERTERS = new HashMap<Class<?>, LuaValueConverter<?>>();
 	static {
 		LuaValueConverter<Boolean> booleanConverter = new LuaValueConverter<Boolean>() {
 			@Override
 			public Boolean convert(LuaState luaState, int index) {
 				return Boolean.valueOf(luaState.toBoolean(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Boolean.class, booleanConverter);
 		LUA_VALUE_CONVERTERS.put(Boolean.TYPE, booleanConverter);

 		LuaValueConverter<Byte> byteConverter = new LuaValueConverter<Byte>() {
 			@Override
 			public Byte convert(LuaState luaState, int index) {
 				return Byte.valueOf((byte) luaState.toInteger(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Byte.class, byteConverter);
 		LUA_VALUE_CONVERTERS.put(Byte.TYPE, byteConverter);
 		LuaValueConverter<Short> shortConverter = new LuaValueConverter<Short>() {
 			@Override
 			public Short convert(LuaState luaState, int index) {
 				return Short.valueOf((short) luaState.toInteger(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Short.class, shortConverter);
 		LUA_VALUE_CONVERTERS.put(Short.TYPE, shortConverter);
 		LuaValueConverter<Integer> integerConverter = new LuaValueConverter<Integer>() {
 			@Override
 			public Integer convert(LuaState luaState, int index) {
 				return Integer.valueOf(luaState.toInteger(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Integer.class, integerConverter);
 		LUA_VALUE_CONVERTERS.put(Integer.TYPE, integerConverter);
 		LuaValueConverter<Long> longConverter = new LuaValueConverter<Long>() {
 			@Override
 			public Long convert(LuaState luaState, int index) {
 				return Long.valueOf((long) luaState.toNumber(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Long.class, longConverter);
 		LUA_VALUE_CONVERTERS.put(Long.TYPE, longConverter);
 		LuaValueConverter<Float> floatConverter = new LuaValueConverter<Float>() {
 			@Override
 			public Float convert(LuaState luaState, int index) {
 				return Float.valueOf((float) luaState.toNumber(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Float.class, floatConverter);
 		LUA_VALUE_CONVERTERS.put(Float.TYPE, floatConverter);
 		LuaValueConverter<Double> doubleConverter = new LuaValueConverter<Double>() {
 			@Override
 			public Double convert(LuaState luaState, int index) {
 				return Double.valueOf(luaState.toNumber(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Double.class, doubleConverter);
 		LUA_VALUE_CONVERTERS.put(Double.TYPE, doubleConverter);
 		LuaValueConverter<BigInteger> bigIntegerConverter = new LuaValueConverter<BigInteger>() {
 			@Override
 			public BigInteger convert(LuaState luaState, int index) {
 				return BigDecimal.valueOf(luaState.toNumber(index))
 						.setScale(0, BigDecimal.ROUND_HALF_EVEN).toBigInteger();
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(BigInteger.class, bigIntegerConverter);
 		LuaValueConverter<BigDecimal> bigDecimalConverter = new LuaValueConverter<BigDecimal>() {
 			@Override
 			public BigDecimal convert(LuaState luaState, int index) {
 				return BigDecimal.valueOf(luaState.toNumber(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(BigDecimal.class, bigDecimalConverter);
 		LuaValueConverter<Character> characterConverter = new LuaValueConverter<Character>() {
 			@Override
 			public Character convert(LuaState luaState, int index) {
 				return Character.valueOf((char) luaState.toInteger(index));
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(Character.class, characterConverter);
 		LUA_VALUE_CONVERTERS.put(Character.TYPE, characterConverter);
 		LuaValueConverter<String> stringConverter = new LuaValueConverter<String>() {
 			@Override
 			public String convert(LuaState luaState, int index) {
 				return luaState.toString(index);
 			}
 		};
 		LUA_VALUE_CONVERTERS.put(String.class, stringConverter);
 		if (!RAW_BYTE_ARRAY) {
 			LuaValueConverter<byte[]> byteArrayConverter = new LuaValueConverter<byte[]>() {
 				@Override
 				public byte[] convert(LuaState luaState, int index) {
 					return luaState.toByteArray(index);
 				}
 			};
 			LUA_VALUE_CONVERTERS.put(byte[].class, byteArrayConverter);
 		}
 	}

 	/**
 	 * Java object converters.
 	 */
 	private static final Map<Class<?>, JavaObjectConverter<?>> JAVA_OBJECT_CONVERTERS = new HashMap<Class<?>, JavaObjectConverter<?>>();
 	static {
 		JavaObjectConverter<Boolean> booleanConverter = new JavaObjectConverter<Boolean>() {
 			@Override
 			public void convert(LuaState luaState, Boolean booleanValue) {
 				luaState.pushBoolean(booleanValue.booleanValue());
 			}
 		};
 		JAVA_OBJECT_CONVERTERS.put(Boolean.class, booleanConverter);
 		JAVA_OBJECT_CONVERTERS.put(Boolean.TYPE, booleanConverter);
 		JavaObjectConverter<Number> numberConverter = new JavaObjectConverter<Number>() {
 			@Override
 			public void convert(LuaState luaState, Number number) {
 				luaState.pushNumber(number.doubleValue());
 			}
 		};
 		JAVA_OBJECT_CONVERTERS.put(Byte.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Byte.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Short.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Short.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Integer.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Integer.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Long.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Long.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Float.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Float.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Double.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(Double.TYPE, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(BigInteger.class, numberConverter);
 		JAVA_OBJECT_CONVERTERS.put(BigDecimal.class, numberConverter);
 		JavaObjectConverter<Character> characterConverter = new JavaObjectConverter<Character>() {
 			@Override
 			public void convert(LuaState luaState, Character character) {
 				luaState.pushInteger(character.charValue());
 			}
 		};
 		JAVA_OBJECT_CONVERTERS.put(Character.class, characterConverter);
 		JAVA_OBJECT_CONVERTERS.put(Character.TYPE, characterConverter);
 		JavaObjectConverter<String> stringConverter = new JavaObjectConverter<String>() {
 			@Override
 			public void convert(LuaState luaState, String string) {
 				luaState.pushString(string);
 			}
 		};
 		JAVA_OBJECT_CONVERTERS.put(String.class, stringConverter);
 		if (!RAW_BYTE_ARRAY) {
 			JavaObjectConverter<byte[]> byteArrayConverter = new JavaObjectConverter<byte[]>() {
 				@Override
 				public void convert(LuaState luaState, byte[] byteArray) {
 					luaState.pushByteArray(byteArray);
 				}
 			};
 			JAVA_OBJECT_CONVERTERS.put(byte[].class, byteArrayConverter);
 		}
 	}

 	// -- Static methods
 	/**
 	 * Returns the instance of this class.
 	 *
 	 * @return the instance
 	 */
 	public static DefaultConverter getInstance() {
 		return INSTANCE;
 	}

 	// -- Construction
 	/**
 	 * Singleton.
 	 */
 	private DefaultConverter() {
 	}

 	// -- Java converter methods
 	@Override
 	public int getTypeDistance(LuaState luaState, int index, Class<?> formalType) {
 		// Handle none
 		LuaType luaType = luaState.type(index);
 		if (luaType == null) {
 			return Integer.MAX_VALUE;
 		}

 		// Handle void
 		if (formalType == Void.TYPE) {
 			return Integer.MAX_VALUE;
 		}

 		// Handle Lua value proxy
 		if (formalType == LuaValueProxy.class) {
 			return 0;
 		}

 		// Handle Lua types
 		switch (luaType) {
 		case NIL:
 			return 1;
 		case BOOLEAN:
 			Integer distance = BOOLEAN_DISTANCE_MAP.get(formalType);
 			if (distance != null) {
 				return distance.intValue();
 			}
 			break;
 		case NUMBER:
 			distance = NUMBER_DISTANCE_MAP.get(formalType);
 			if (distance != null) {
 				return distance.intValue();
 			}
 			break;
 		case STRING:
 			distance = STRING_DISTANCE_MAP.get(formalType);
 			if (distance != null) {
 				return distance.intValue();
 			}
 			break;
 		case TABLE:
 			if (formalType == Map.class || formalType == List.class
 					|| formalType.isArray()) {
 				return 1;
 			}
 			if (formalType == Object.class) {
 				return 2;
 			}
 			break;
 		case FUNCTION:
 			if (luaState.isJavaFunction(index)) {
 				distance = FUNCTION_DISTANCE_MAP.get(formalType);
 				if (distance != null) {
 					return distance.intValue();
 				}
 			}
 			break;
 		case USERDATA:
 			Object object = luaState.toJavaObjectRaw(index);
 			if (object != null) {
 				Class<?> type;
 				if (object instanceof TypedJavaObject) {
 					TypedJavaObject typedJavaObject = (TypedJavaObject) object;
 					if (typedJavaObject.isStrong()) {
 						if (formalType.isAssignableFrom(typedJavaObject
 								.getClass())) {
 							return 1;
 						}
 					}
 					type = typedJavaObject.getType();
 				} else {
 					type = object.getClass();
 				}
 				if (formalType.isAssignableFrom(type)) {
 					return 1;
 				}
 			}
 			break;
 		}

 		// Handle object
 		if (formalType == Object.class) {
 			return Integer.MAX_VALUE - 1;
 		}

 		// Unsupported conversion
 		return Integer.MAX_VALUE;
 	}

 	@SuppressWarnings("unchecked")
 	@Override
 	public <T> T convertLuaValue(LuaState luaState, int index,
 			Class<T> formalType) {
 		// Handle none
 		LuaType luaType = luaState.type(index);
 		if (luaType == null) {
 			throw new IllegalArgumentException("undefined index: " + index);
 		}

 		// Handle void
 		if (formalType == Void.TYPE) {
 			throw new ClassCastException(String.format(
 					"cannot convert %s to %s", luaState.typeName(index),
 					formalType.getCanonicalName()));
 		}

 		// Handle Lua value proxy
 		if (formalType == LuaValueProxy.class) {
 			return (T) luaState.getProxy(index);
 		}

 		// Handle Lua types
 		switch (luaType) {
 		case NIL:
 			return null;
 		case BOOLEAN:
 			LuaValueConverter<?> luaValueConverter;
 			luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
 			if (luaValueConverter != null) {
 				return (T) luaValueConverter.convert(luaState, index);
 			}
 			if (formalType == Object.class) {
 				return (T) Boolean.valueOf(luaState.toBoolean(index));
 			}
 			break;
 		case NUMBER:
 			luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
 			if (luaValueConverter != null) {
 				return (T) luaValueConverter.convert(luaState, index);
 			}
 			if (formalType == Object.class) {
 				return (T) Double.valueOf(luaState.toNumber(index));
 			}
 			break;
 		case STRING:
 			luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
 			if (luaValueConverter != null) {
 				return (T) luaValueConverter.convert(luaState, index);
 			}
 			if (formalType == Object.class) {
 				return (T) luaState.toString(index);
 			}
 			break;
 		case TABLE:
 			if (formalType == Map.class || formalType == Object.class) {
 				final LuaValueProxy luaValueProxy = luaState.getProxy(index);
 				return (T) new AbstractTableMap<Object>() {
 					@Override
 					protected Object convertKey(int index) {
 						return getLuaState().toJavaObject(index, Object.class);
 					}

 					@Override
 					public LuaState getLuaState() {
 						return luaValueProxy.getLuaState();
 					}

 					@Override
 					public void pushValue() {
 						luaValueProxy.pushValue();
 					}
 				};
 			}
 			if (formalType == List.class) {
 				final LuaValueProxy luaValueProxy = luaState.getProxy(index);
 				return (T) new AbstractTableList() {
 					@Override
 					public LuaState getLuaState() {
 						return luaValueProxy.getLuaState();
 					}

 					@Override
 					public void pushValue() {
 						luaValueProxy.pushValue();
 					}
 				};
 			}
 			if (formalType.isArray()) {
 				int length = luaState.rawLen(index);
 				Class<?> componentType = formalType.getComponentType();
 				Object array = Array.newInstance(formalType.getComponentType(),
 						length);
 				for (int i = 0; i < length; i++) {
 					luaState.rawGet(index, i + 1);
 					try {
 						Array.set(array, i,
 								convertLuaValue(luaState, -1, componentType));
 					} finally {
 						luaState.pop(1);
 					}
 				}
 				return (T) array;
 			}
 			break;
 		case FUNCTION:
 			if (luaState.isJavaFunction(index)) {
 				if (formalType == JavaFunction.class
 						|| formalType == Object.class) {
 					return (T) luaState.toJavaFunction(index);
 				}
 			}
 			break;
 		case USERDATA:
 			Object object = luaState.toJavaObjectRaw(index);
 			if (object != null) {
 				if (object instanceof TypedJavaObject) {
 					TypedJavaObject typedJavaObject = (TypedJavaObject) object;
 					if (typedJavaObject.isStrong()) {
 						if (formalType.isAssignableFrom(typedJavaObject
 								.getClass())) {
 							return (T) typedJavaObject;
 						}
 					}
 					return (T) ((TypedJavaObject) object).getObject();
 				} else {
 					return (T) object;
 				}
 			}
 			break;
 		}

 		// Handle object
 		if (formalType == Object.class) {
 			return (T) luaState.getProxy(index);
 		}

 		// Unsupported conversion
 		throw new ClassCastException(String.format("cannot convert %s to %s",
 				luaState.typeName(index), formalType.getCanonicalName()));
 	}

 	@SuppressWarnings("unchecked")
 	@Override
 	public void convertJavaObject(LuaState luaState, Object object) {
 		// Handle null
 		if (object == null) {
 			luaState.pushNil();
 			return;
 		}

 		// Handle known Java types
 		JavaObjectConverter<Object> javaObjectConverter = (JavaObjectConverter<Object>) JAVA_OBJECT_CONVERTERS
 				.get(object.getClass());
 		if (javaObjectConverter != null) {
 			javaObjectConverter.convert(luaState, object);
 			return;
 		}
 		if (object instanceof JavaFunction) {
 			luaState.pushJavaFunction((JavaFunction) object);
 			return;
 		}
 		if (object instanceof LuaValueProxy) {
 			LuaValueProxy luaValueProxy = (LuaValueProxy) object;
 			if (!luaValueProxy.getLuaState().equals(luaState)) {
 				throw new IllegalArgumentException(
 						"Lua value proxy is from a different Lua state");
 			}
 			luaValueProxy.pushValue();
 			return;
 		}

 		// Push as is
 		luaState.pushJavaObjectRaw(object);
 	}

 	// -- Nested types
 	/**
 	 * Converts Lua values.
 	 */
 	private interface LuaValueConverter<T> {
 		/**
 		 * Converts a Lua value to a Java object.
 		 */
 		public T convert(LuaState luaState, int index);
 	}

 	/**
 	 * Converts Java object.
 	 */
 	private interface JavaObjectConverter<T> {
 		/**
 		 * Converts a Java object to a Lua value.
 		 */
 		public void convert(LuaState luaState, T object);
 	}
 }
	/*
	* $Id: DefaultConverter.java 161 2012-10-06 13:53:02Z andre@naef.com $
	* See LICENSE.txt for license terms.
	*/

	package com.naef.jnlua;

	import java.lang.reflect.Array;
	import java.math.BigDecimal;
	import java.math.BigInteger;
	import java.util.HashMap;
	import java.util.List;
	import java.util.Map;

	import com.naef.jnlua.util.AbstractTableList;
	import com.naef.jnlua.util.AbstractTableMap;

	/**
	* Default implementation of the <code>Converter</code> interface.
	*/
	public class DefaultConverter implements Converter {
	// -- Static
	/**
	* Raw byte array.
	*/
	private static final boolean RAW_BYTE_ARRAY = Boolean.parseBoolean(System
	.getProperty(DefaultConverter.class.getPackage().getName()
	+ ".rawByteArray"));

	/**
	* Static instance.
	*/
	private static final DefaultConverter INSTANCE = new DefaultConverter();

	/**
	* Boolean distance map.
	*/
	private static final Map<Class<?>, Integer> BOOLEAN_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
	static {
	BOOLEAN_DISTANCE_MAP.put(Boolean.class, new Integer(1));
	BOOLEAN_DISTANCE_MAP.put(Boolean.TYPE, new Integer(1));
	BOOLEAN_DISTANCE_MAP.put(Object.class, new Integer(2));
	}

	/**
	* Number distance map.
	*/
	private static final Map<Class<?>, Integer> NUMBER_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
	static {
	NUMBER_DISTANCE_MAP.put(Byte.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Byte.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Short.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Short.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Integer.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Integer.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Long.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Long.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Float.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Float.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Double.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Double.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(BigInteger.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(BigDecimal.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Character.class, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Character.TYPE, new Integer(1));
	NUMBER_DISTANCE_MAP.put(Object.class, new Integer(2));
	NUMBER_DISTANCE_MAP.put(String.class, new Integer(3));
	if (!RAW_BYTE_ARRAY) {
	NUMBER_DISTANCE_MAP.put(byte[].class, new Integer(3));
	}
	}

	/**
	* String distance map.
	*/
	private static final Map<Class<?>, Integer> STRING_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
	static {
	STRING_DISTANCE_MAP.put(String.class, new Integer(1));
	if (!RAW_BYTE_ARRAY) {
	STRING_DISTANCE_MAP.put(byte[].class, new Integer(1));
	}
	STRING_DISTANCE_MAP.put(Object.class, new Integer(2));
	STRING_DISTANCE_MAP.put(Byte.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Byte.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(Short.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Short.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(Integer.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Integer.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(Long.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Long.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(Float.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Float.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(Double.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Double.TYPE, new Integer(3));
	STRING_DISTANCE_MAP.put(BigInteger.class, new Integer(3));
	STRING_DISTANCE_MAP.put(BigDecimal.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Character.class, new Integer(3));
	STRING_DISTANCE_MAP.put(Character.TYPE, new Integer(3));
	}

	/**
	* Function distance map.
	*/
	private static final Map<Class<?>, Integer> FUNCTION_DISTANCE_MAP = new HashMap<Class<?>, Integer>();
	static {
	FUNCTION_DISTANCE_MAP.put(JavaFunction.class, new Integer(1));
	FUNCTION_DISTANCE_MAP.put(Object.class, new Integer(2));
	}

	/**
	* Lua value converters.
	*/
	private static final Map<Class<?>, LuaValueConverter<?>> LUA_VALUE_CONVERTERS = new HashMap<Class<?>, LuaValueConverter<?>>();
	static {
	LuaValueConverter<Boolean> booleanConverter = new LuaValueConverter<Boolean>() {
	@Override
	public Boolean convert(LuaState luaState, int index) {
	return Boolean.valueOf(luaState.toBoolean(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Boolean.class, booleanConverter);
	LUA_VALUE_CONVERTERS.put(Boolean.TYPE, booleanConverter);

	LuaValueConverter<Byte> byteConverter = new LuaValueConverter<Byte>() {
	@Override
	public Byte convert(LuaState luaState, int index) {
	return Byte.valueOf((byte) luaState.toInteger(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Byte.class, byteConverter);
	LUA_VALUE_CONVERTERS.put(Byte.TYPE, byteConverter);
	LuaValueConverter<Short> shortConverter = new LuaValueConverter<Short>() {
	@Override
	public Short convert(LuaState luaState, int index) {
	return Short.valueOf((short) luaState.toInteger(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Short.class, shortConverter);
	LUA_VALUE_CONVERTERS.put(Short.TYPE, shortConverter);
	LuaValueConverter<Integer> integerConverter = new LuaValueConverter<Integer>() {
	@Override
	public Integer convert(LuaState luaState, int index) {
	return Integer.valueOf(luaState.toInteger(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Integer.class, integerConverter);
	LUA_VALUE_CONVERTERS.put(Integer.TYPE, integerConverter);
	LuaValueConverter<Long> longConverter = new LuaValueConverter<Long>() {
	@Override
	public Long convert(LuaState luaState, int index) {
	return Long.valueOf((long) luaState.toNumber(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Long.class, longConverter);
	LUA_VALUE_CONVERTERS.put(Long.TYPE, longConverter);
	LuaValueConverter<Float> floatConverter = new LuaValueConverter<Float>() {
	@Override
	public Float convert(LuaState luaState, int index) {
	return Float.valueOf((float) luaState.toNumber(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Float.class, floatConverter);
	LUA_VALUE_CONVERTERS.put(Float.TYPE, floatConverter);
	LuaValueConverter<Double> doubleConverter = new LuaValueConverter<Double>() {
	@Override
	public Double convert(LuaState luaState, int index) {
	return Double.valueOf(luaState.toNumber(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Double.class, doubleConverter);
	LUA_VALUE_CONVERTERS.put(Double.TYPE, doubleConverter);
	LuaValueConverter<BigInteger> bigIntegerConverter = new LuaValueConverter<BigInteger>() {
	@Override
	public BigInteger convert(LuaState luaState, int index) {
	return BigDecimal.valueOf(luaState.toNumber(index))
	.setScale(0, BigDecimal.ROUND_HALF_EVEN).toBigInteger();
	}
	};
	LUA_VALUE_CONVERTERS.put(BigInteger.class, bigIntegerConverter);
	LuaValueConverter<BigDecimal> bigDecimalConverter = new LuaValueConverter<BigDecimal>() {
	@Override
	public BigDecimal convert(LuaState luaState, int index) {
	return BigDecimal.valueOf(luaState.toNumber(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(BigDecimal.class, bigDecimalConverter);
	LuaValueConverter<Character> characterConverter = new LuaValueConverter<Character>() {
	@Override
	public Character convert(LuaState luaState, int index) {
	return Character.valueOf((char) luaState.toInteger(index));
	}
	};
	LUA_VALUE_CONVERTERS.put(Character.class, characterConverter);
	LUA_VALUE_CONVERTERS.put(Character.TYPE, characterConverter);
	LuaValueConverter<String> stringConverter = new LuaValueConverter<String>() {
	@Override
	public String convert(LuaState luaState, int index) {
	return luaState.toString(index);
	}
	};
	LUA_VALUE_CONVERTERS.put(String.class, stringConverter);
	if (!RAW_BYTE_ARRAY) {
	LuaValueConverter<byte[]> byteArrayConverter = new LuaValueConverter<byte[]>() {
	@Override
	public byte[] convert(LuaState luaState, int index) {
	return luaState.toByteArray(index);
	}
	};
	LUA_VALUE_CONVERTERS.put(byte[].class, byteArrayConverter);
	}
	}

	/**
	* Java object converters.
	*/
	private static final Map<Class<?>, JavaObjectConverter<?>> JAVA_OBJECT_CONVERTERS = new HashMap<Class<?>, JavaObjectConverter<?>>();
	static {
	JavaObjectConverter<Boolean> booleanConverter = new JavaObjectConverter<Boolean>() {
	@Override
	public void convert(LuaState luaState, Boolean booleanValue) {
	luaState.pushBoolean(booleanValue.booleanValue());
	}
	};
	JAVA_OBJECT_CONVERTERS.put(Boolean.class, booleanConverter);
	JAVA_OBJECT_CONVERTERS.put(Boolean.TYPE, booleanConverter);
	JavaObjectConverter<Number> numberConverter = new JavaObjectConverter<Number>() {
	@Override
	public void convert(LuaState luaState, Number number) {
	luaState.pushNumber(number.doubleValue());
	}
	};
	JAVA_OBJECT_CONVERTERS.put(Byte.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Byte.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Short.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Short.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Integer.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Integer.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Long.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Long.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Float.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Float.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Double.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(Double.TYPE, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(BigInteger.class, numberConverter);
	JAVA_OBJECT_CONVERTERS.put(BigDecimal.class, numberConverter);
	JavaObjectConverter<Character> characterConverter = new JavaObjectConverter<Character>() {
	@Override
	public void convert(LuaState luaState, Character character) {
	luaState.pushInteger(character.charValue());
	}
	};
	JAVA_OBJECT_CONVERTERS.put(Character.class, characterConverter);
	JAVA_OBJECT_CONVERTERS.put(Character.TYPE, characterConverter);
	JavaObjectConverter<String> stringConverter = new JavaObjectConverter<String>() {
	@Override
	public void convert(LuaState luaState, String string) {
	luaState.pushString(string);
	}
	};
	JAVA_OBJECT_CONVERTERS.put(String.class, stringConverter);
	if (!RAW_BYTE_ARRAY) {
	JavaObjectConverter<byte[]> byteArrayConverter = new JavaObjectConverter<byte[]>() {
	@Override
	public void convert(LuaState luaState, byte[] byteArray) {
	luaState.pushByteArray(byteArray);
	}
	};
	JAVA_OBJECT_CONVERTERS.put(byte[].class, byteArrayConverter);
	}
	}

	// -- Static methods
	/**
	* Returns the instance of this class.
	*
	* @return the instance
	*/
	public static DefaultConverter getInstance() {
	return INSTANCE;
	}

	// -- Construction
	/**
	* Singleton.
	*/
	private DefaultConverter() {
	}

	// -- Java converter methods
	@Override
	public int getTypeDistance(LuaState luaState, int index, Class<?> formalType) {
	// Handle none
	LuaType luaType = luaState.type(index);
	if (luaType == null) {
	return Integer.MAX_VALUE;
	}

	// Handle void
	if (formalType == Void.TYPE) {
	return Integer.MAX_VALUE;
	}

	// Handle Lua value proxy
	if (formalType == LuaValueProxy.class) {
	return 0;
	}

	// Handle Lua types
	switch (luaType) {
	case NIL:
	return 1;
	case BOOLEAN:
	Integer distance = BOOLEAN_DISTANCE_MAP.get(formalType);
	if (distance != null) {
	return distance.intValue();
	}
	break;
	case NUMBER:
	distance = NUMBER_DISTANCE_MAP.get(formalType);
	if (distance != null) {
	return distance.intValue();
	}
	break;
	case STRING:
	distance = STRING_DISTANCE_MAP.get(formalType);
	if (distance != null) {
	return distance.intValue();
	}
	break;
	case TABLE:
	if (formalType == Map.class \|\| formalType == List.class
	\|\| formalType.isArray()) {
	return 1;
	}
	if (formalType == Object.class) {
	return 2;
	}
	break;
	case FUNCTION:
	if (luaState.isJavaFunction(index)) {
	distance = FUNCTION_DISTANCE_MAP.get(formalType);
	if (distance != null) {
	return distance.intValue();
	}
	}
	break;
	case USERDATA:
	Object object = luaState.toJavaObjectRaw(index);
	if (object != null) {
	Class<?> type;
	if (object instanceof TypedJavaObject) {
	TypedJavaObject typedJavaObject = (TypedJavaObject) object;
	if (typedJavaObject.isStrong()) {
	if (formalType.isAssignableFrom(typedJavaObject
	.getClass())) {
	return 1;
	}
	}
	type = typedJavaObject.getType();
	} else {
	type = object.getClass();
	}
	if (formalType.isAssignableFrom(type)) {
	return 1;
	}
	}
	break;
	}

	// Handle object
	if (formalType == Object.class) {
	return Integer.MAX_VALUE - 1;
	}

	// Unsupported conversion
	return Integer.MAX_VALUE;
	}

	@SuppressWarnings("unchecked")
	@Override
	public <T> T convertLuaValue(LuaState luaState, int index,
	Class<T> formalType) {
	// Handle none
	LuaType luaType = luaState.type(index);
	if (luaType == null) {
	throw new IllegalArgumentException("undefined index: " + index);
	}

	// Handle void
	if (formalType == Void.TYPE) {
	throw new ClassCastException(String.format(
	"cannot convert %s to %s", luaState.typeName(index),
	formalType.getCanonicalName()));
	}

	// Handle Lua value proxy
	if (formalType == LuaValueProxy.class) {
	return (T) luaState.getProxy(index);
	}

	// Handle Lua types
	switch (luaType) {
	case NIL:
	return null;
	case BOOLEAN:
	LuaValueConverter<?> luaValueConverter;
	luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
	if (luaValueConverter != null) {
	return (T) luaValueConverter.convert(luaState, index);
	}
	if (formalType == Object.class) {
	return (T) Boolean.valueOf(luaState.toBoolean(index));
	}
	break;
	case NUMBER:
	luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
	if (luaValueConverter != null) {
	return (T) luaValueConverter.convert(luaState, index);
	}
	if (formalType == Object.class) {
	return (T) Double.valueOf(luaState.toNumber(index));
	}
	break;
	case STRING:
	luaValueConverter = LUA_VALUE_CONVERTERS.get(formalType);
	if (luaValueConverter != null) {
	return (T) luaValueConverter.convert(luaState, index);
	}
	if (formalType == Object.class) {
	return (T) luaState.toString(index);
	}
	break;
	case TABLE:
	if (formalType == Map.class \|\| formalType == Object.class) {
	final LuaValueProxy luaValueProxy = luaState.getProxy(index);
	return (T) new AbstractTableMap<Object>() {
	@Override
	protected Object convertKey(int index) {
	return getLuaState().toJavaObject(index, Object.class);
	}

	@Override
	public LuaState getLuaState() {
	return luaValueProxy.getLuaState();
	}

	@Override
	public void pushValue() {
	luaValueProxy.pushValue();
	}
	};
	}
	if (formalType == List.class) {
	final LuaValueProxy luaValueProxy = luaState.getProxy(index);
	return (T) new AbstractTableList() {
	@Override
	public LuaState getLuaState() {
	return luaValueProxy.getLuaState();
	}

	@Override
	public void pushValue() {
	luaValueProxy.pushValue();
	}
	};
	}
	if (formalType.isArray()) {
	int length = luaState.rawLen(index);
	Class<?> componentType = formalType.getComponentType();
	Object array = Array.newInstance(formalType.getComponentType(),
	length);
	for (int i = 0; i < length; i++) {
	luaState.rawGet(index, i + 1);
	try {
	Array.set(array, i,
	convertLuaValue(luaState, -1, componentType));
	} finally {
	luaState.pop(1);
	}
	}
	return (T) array;
	}
	break;
	case FUNCTION:
	if (luaState.isJavaFunction(index)) {
	if (formalType == JavaFunction.class
	\|\| formalType == Object.class) {
	return (T) luaState.toJavaFunction(index);
	}
	}
	break;
	case USERDATA:
	Object object = luaState.toJavaObjectRaw(index);
	if (object != null) {
	if (object instanceof TypedJavaObject) {
	TypedJavaObject typedJavaObject = (TypedJavaObject) object;
	if (typedJavaObject.isStrong()) {
	if (formalType.isAssignableFrom(typedJavaObject
	.getClass())) {
	return (T) typedJavaObject;
	}
	}
	return (T) ((TypedJavaObject) object).getObject();
	} else {
	return (T) object;
	}
	}
	break;
	}

	// Handle object
	if (formalType == Object.class) {
	return (T) luaState.getProxy(index);
	}

	// Unsupported conversion
	throw new ClassCastException(String.format("cannot convert %s to %s",
	luaState.typeName(index), formalType.getCanonicalName()));
	}

	@SuppressWarnings("unchecked")
	@Override
	public void convertJavaObject(LuaState luaState, Object object) {
	// Handle null
	if (object == null) {
	luaState.pushNil();
	return;
	}

	// Handle known Java types
	JavaObjectConverter<Object> javaObjectConverter = (JavaObjectConverter<Object>) JAVA_OBJECT_CONVERTERS
	.get(object.getClass());
	if (javaObjectConverter != null) {
	javaObjectConverter.convert(luaState, object);
	return;
	}
	if (object instanceof JavaFunction) {
	luaState.pushJavaFunction((JavaFunction) object);
	return;
	}
	if (object instanceof LuaValueProxy) {
	LuaValueProxy luaValueProxy = (LuaValueProxy) object;
	if (!luaValueProxy.getLuaState().equals(luaState)) {
	throw new IllegalArgumentException(
	"Lua value proxy is from a different Lua state");
	}
	luaValueProxy.pushValue();
	return;
	}

	// Push as is
	luaState.pushJavaObjectRaw(object);
	}

	// -- Nested types
	/**
	* Converts Lua values.
	*/
	private interface LuaValueConverter<T> {
	/**
	* Converts a Lua value to a Java object.
	*/
	public T convert(LuaState luaState, int index);
	}

	/**
	* Converts Java object.
	*/
	private interface JavaObjectConverter<T> {
	/**
	* Converts a Java object to a Lua value.
	*/
	public void convert(LuaState luaState, T object);
	}
	}