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Various utilities for accessing internals of a class.
There is a newer version: 2.0.9
/*
 * Copyright 2008 the original author or authors.
 *
 * 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.powermock.reflect.internal.primitivesupport;

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

/**
 * The purpose of the Primitive Wrapper is to provide methods that deals with
 * translating wrapper types to its related primitive type.
 */
public class PrimitiveWrapper {
	private static final Map, Class> primitiveWrapper = new HashMap, Class>();

	static {
		primitiveWrapper.put(Integer.class, int.class);
		primitiveWrapper.put(Long.class, long.class);
		primitiveWrapper.put(Float.class, float.class);
		primitiveWrapper.put(Double.class, double.class);
		primitiveWrapper.put(Boolean.class, boolean.class);
		primitiveWrapper.put(Byte.class, byte.class);
		primitiveWrapper.put(Short.class, short.class);
		primitiveWrapper.put(Character.class, char.class);
	}

	/**
	 * Convert all wrapper types in {@code types} to their primitive
	 * counter parts.
	 * 
	 * @param types
	 *            The array of types that should be converted.
	 * @return A new array where all wrapped types have been converted to their
	 *         primitive counter part.
	 */
	public static Class[] toPrimitiveType(Class[] types) {
		if (types == null) {
			throw new IllegalArgumentException("types cannot be null");
		}

		Class[] convertedTypes = new Class[types.length];
		for (int i = 0; i < types.length; i++) {
			final Class originalType = types[i];
			Class primitiveType = primitiveWrapper.get(originalType);
			if (primitiveType == null) {
				convertedTypes[i] = originalType;
			} else {
				convertedTypes[i] = primitiveType;
			}
		}
		return convertedTypes;
	}

	/**
	 * Get the primitive counter part from a wrapped type. For example:
	 * 
	 * 
	 * {@code getPrimitiveFromWrapperType(Integer.class)} will return
	 * {@code int.class}.
	 * 
	 * 
	 * @param wrapperType
	 *            The wrapper type to convert to its primitive counter part.
	 * @return The primitive counter part or {@code null} if the class did
	 *         not have a primitive counter part.
	 * 
	 */
	public static Class getPrimitiveFromWrapperType(Class wrapperType) {
		return primitiveWrapper.get(wrapperType);
	}

	/**
	 * Returns {@code true} if {@code type} has a primitive
	 * counter-part. E.g. if {@code type} if {@code Integer} then this
	 * method will return {@code true}.
	 * 
	 * @param type
	 *            The type to check whether or not it has a primitive
	 *            counter-part.
	 * @return {@code true} if this type has a primitive counter-part.
	 */
	public static boolean hasPrimitiveCounterPart(Class type) {
		return primitiveWrapper.containsKey(type);
	}
}