Mega Code Archive
Get Generic Parameter
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/*
* Copyright 2008-2010 the T2 Project ant the Others.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//package org.t2framework.commons.util;
import java.lang.reflect.Array;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.GenericDeclaration;
import java.lang.reflect.Method;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.Collection;
import java.util.Collections;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
public class GenericsUtil {
public static Type[] getGenericParameter(final Type type) {
if (ParameterizedType.class.isInstance(type)) {
return ParameterizedType.class.cast(type).getActualTypeArguments();
} else if (GenericArrayType.class.isInstance(type)) {
final Type genericComponentType = GenericArrayType.class.cast(type)
.getGenericComponentType();
return getGenericParameter(genericComponentType);
} else if (Class.class.isInstance(type)) {
return Class.class.cast(type).getTypeParameters();
} else {
return null;
}
}
public static Type getGenericParameter(final Type type, final int index) {
if (ParameterizedType.class.isInstance(type) == false) {
return null;
}
final Type[] genericParameter = getGenericParameter(type);
if (genericParameter == null) {
return null;
}
return genericParameter[index];
}
}
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