Java Reflection Primitive getPrimitivePromotionCost(final Class srcClass, final Class destClass)

Description

get Primitive Promotion Cost

License

Apache License

Declaration

private static float getPrimitivePromotionCost(final Class<?> srcClass, final Class<?> destClass) 

Method Source Code

//package com.java2s;
/*/*from www  .jav a2 s.  c  om*/
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.
 */

import java.util.HashMap;
import java.util.Map;

public class Main {
    private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<Class<?>, Class<?>>();
    private static final Class<?>[] ORDERED_PRIMITIVE_TYPES = { Byte.TYPE, Short.TYPE, Character.TYPE, Integer.TYPE,
            Long.TYPE, Float.TYPE, Double.TYPE };

    private static float getPrimitivePromotionCost(final Class<?> srcClass, final Class<?> destClass) {
        float cost = 0.0f;
        Class<?> cls = srcClass;
        if (!cls.isPrimitive()) {
            // slight unwrapping penalty
            cost += 0.1f;
            cls = wrapperToPrimitive(cls);
        }
        for (int i = 0; cls != destClass && i < ORDERED_PRIMITIVE_TYPES.length; i++) {
            if (cls == ORDERED_PRIMITIVE_TYPES[i]) {
                cost += 0.1f;
                if (i < ORDERED_PRIMITIVE_TYPES.length - 1) {
                    cls = ORDERED_PRIMITIVE_TYPES[i + 1];
                }
            }
        }
        return cost;
    }

    public static Class<?> wrapperToPrimitive(final Class<?> cls) {
        return wrapperPrimitiveMap.get(cls);
    }
}

Related

1. getPrimitiveClass(String name)
2. getPrimitiveClass(String primitiveClassName)
3. getPrimitiveClass(String primitiveName)
4. getPrimitiveClassIfWrapper(Class clazz)
5. getPrimitiveDefault(Class primitiveClazz)
6. getPrimitiveSize(Class type)
7. getPrimitiveType(Class clazz)
8. getPrimitiveType(String javaClassName)
9. getPrimitiveWrapper(Class primitiveType)