/*
* Copied from Gentyref project http://code.google.com/p/gentyref/
* Reformatted and moved to fit package structure
*/
package com.vercer.engine.persist.util.generic;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.lang.reflect.WildcardType;
import java.util.HashMap;
import java.util.Map;
/**
* Mapping between type variables and actual parameters.
*
* @author Wouter Coekaerts <wouter@coekaerts.be>
*/
class VarMap
{
private final Map<TypeVariable<?>, Type> map = new HashMap<TypeVariable<?>, Type>();
/**
* Creates an empty VarMap
*/
VarMap()
{
}
void add(TypeVariable<?> variable, Type value)
{
map.put(variable, value);
}
void addAll(TypeVariable<?>[] variables, Type[] values)
{
assert variables.length == values.length;
for (int i = 0; i < variables.length; i++)
{
map.put(variables[i], values[i]);
}
}
VarMap(TypeVariable<?>[] variables, Type[] values)
{
addAll(variables, values);
}
Type map(Type type)
{
if (type instanceof Class<?>)
{
return type;
}
else if (type instanceof TypeVariable<?>)
{
assert map.containsKey(type);
return map.get(type);
}
else if (type instanceof ParameterizedType)
{
ParameterizedType pType = (ParameterizedType) type;
return new ParameterizedTypeImpl((Class<?>) pType.getRawType(), map(pType
.getActualTypeArguments()), pType.getOwnerType() == null ? pType.getOwnerType()
: map(pType.getOwnerType()));
}
else if (type instanceof WildcardType)
{
WildcardType wType = (WildcardType) type;
return new WildcardTypeImpl(map(wType.getUpperBounds()), map(wType.getLowerBounds()));
}
else if (type instanceof GenericArrayType)
{
return GenericArrayTypeImpl.createArrayType(map(((GenericArrayType) type)
.getGenericComponentType()));
}
else
{
throw new RuntimeException("not implemented: mapping " + type.getClass() + " (" + type
+ ")");
}
}
Type[] map(Type[] types)
{
Type[] result = new Type[types.length];
for (int i = 0; i < types.length; i++)
{
result[i] = map(types[i]);
}
return result;
}
}