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Mockito mock objects library core API and implementation

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/*
 * Copyright (c) 2007 Mockito contributors
 * This program is made available under the terms of the MIT License.
 */
package org.mockito.internal.util.reflection;

import java.lang.reflect.Field;
import java.lang.reflect.Parameter;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

public class GenericMaster {

    /**
     * Finds the generic type (parametrized type) of the field. If the field is not generic it returns Object.class.
     *
     * @param field the field to inspect
     */
    public Class getGenericType(Field field) {
        Type generic = field.getGenericType();
        return getaClass(generic);
    }

    /**
     * Resolves the type (parametrized type) of the parameter. If the field is not generic it returns Object.class.
     *
     * @param parameter the parameter to inspect
     */
    public Class getGenericType(Parameter parameter) {
        return getaClass(parameter.getType());
    }

    private Class getaClass(Type generic) {
        if (generic instanceof ParameterizedType) {
            Type actual = ((ParameterizedType) generic).getActualTypeArguments()[0];
            if (actual instanceof Class) {
                return (Class) actual;
            } else if (actual instanceof ParameterizedType) {
                // in case of nested generics we don't go deep
                return (Class) ((ParameterizedType) actual).getRawType();
            }
        }

        return Object.class;
    }
}