package org.hibernate.annotations.common.reflection.java.generics;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.util.Arrays;
/**
* This class instances our own <code>ParameterizedTypes</code> and <code>GenericArrayTypes</code>.
* These are not supposed to be mixed with Java's implementations - beware of
* equality/identity problems.
*
* @author Paolo Perrotta
*/
class TypeFactory {
static ParameterizedType createParameterizedType(
final Type rawType, final Type[] substTypeArgs,
final Type ownerType
) {
return new ParameterizedType() {
public Type[] getActualTypeArguments() {
return substTypeArgs;
}
public Type getRawType() {
return rawType;
}
public Type getOwnerType() {
return ownerType;
}
@Override
public boolean equals(Object obj) {
if ( !( obj instanceof ParameterizedType ) ) {
return false;
}
ParameterizedType other = (ParameterizedType) obj;
return Arrays.equals( getActualTypeArguments(), other.getActualTypeArguments() )
&& safeEquals( getRawType(), other.getRawType() ) && safeEquals(
getOwnerType(), other.getOwnerType()
);
}
@Override
public int hashCode() {
return safeHashCode( getActualTypeArguments() ) ^ safeHashCode( getRawType() ) ^ safeHashCode(
getOwnerType()
);
}
};
}
static Type createArrayType(Type componentType) {
if ( componentType instanceof Class ) {
return Array.newInstance( (Class) componentType, 0 ).getClass();
}
return TypeFactory.createGenericArrayType( componentType );
}
private static GenericArrayType createGenericArrayType(final Type componentType) {
return new GenericArrayType() {
public Type getGenericComponentType() {
return componentType;
}
@Override
public boolean equals(Object obj) {
if ( !( obj instanceof GenericArrayType ) ) {
return false;
}
GenericArrayType other = (GenericArrayType) obj;
return safeEquals( getGenericComponentType(), other.getGenericComponentType() );
}
@Override
public int hashCode() {
return safeHashCode( getGenericComponentType() );
}
};
}
private static boolean safeEquals(Type t1, Type t2) {
if ( t1 == null ) {
return t2 == null;
}
return t1.equals( t2 );
}
private static int safeHashCode(Object o) {
if ( o == null ) {
return 1;
}
return o.hashCode();
}
}