com.naef.jnlua

Interface Converter

All Known Implementing Classes:

DefaultConverter

public interface Converter

Converts between Lua values and Java objects.

Method Summary

Methods

Modifier and Type	Method and Description
void	convertJavaObject(LuaState luaState, Object object) Converts a Java object to a Lua value and pushes that value on the stack.
<T> T	convertLuaValue(LuaState luaState, int index, Class<T> formalType) Converts a Lua value to a Java object of the specified formal type.
int	getTypeDistance(LuaState luaState, int index, Class<?> formalType) Returns the type distance between a Lua value and a formal Java type.

Method Detail

getTypeDistance

int getTypeDistance(LuaState luaState,
                  int index,
                  Class<?> formalType)

Returns the type distance between a Lua value and a formal Java type. Distances are comparable for the same Lua value only. If a Lua value cannot be converted to the specified formal type, the method returns Integer.MAX_VALUE.

Parameters:

luaState - the Lua state

index - the stack index containing the value

formalType - the formal Java type

Returns:

the type distance, or Integer.MAX_VALUE if the conversion is not supported

convertLuaValue

<T> T convertLuaValue(LuaState luaState,
                    int index,
                    Class<T> formalType)

Converts a Lua value to a Java object of the specified formal type.

If the Lua value is nil, the method returns null.

Parameters:

luaState - the Lua state

index - the stack index containing the value

formalType - the formal Java type

Returns:

the Java object, or null

Throws:

ClassCastException - if the conversion is not possible

convertJavaObject

void convertJavaObject(LuaState luaState,
                     Object object)

Converts a Java object to a Lua value and pushes that value on the stack.

If the object is null, the method pushes nil.

Parameters:

luaState - the Lua state

object - the Java object, or null