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/*
* Copyright (C) 2007 The Guava 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.glassfish.jersey.internal.guava;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import static org.glassfish.jersey.internal.guava.Preconditions.checkNotNull;
/**
* Contains static utility methods pertaining to primitive types and their
* corresponding wrapper types.
*
* @author Kevin Bourrillion
* @since 1.0
*/
public final class Primitives {
/**
* A map from primitive types to their corresponding wrapper types.
*/
private static final Map, Class> PRIMITIVE_TO_WRAPPER_TYPE;
static {
Map, Class> primToWrap = new HashMap, Class>(16);
add(primToWrap, boolean.class, Boolean.class);
add(primToWrap, byte.class, Byte.class);
add(primToWrap, char.class, Character.class);
add(primToWrap, double.class, Double.class);
add(primToWrap, float.class, Float.class);
add(primToWrap, int.class, Integer.class);
add(primToWrap, long.class, Long.class);
add(primToWrap, short.class, Short.class);
add(primToWrap, void.class, Void.class);
PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
}
private Primitives() {
}
private static void add(Map, Class> forward,
Class key, Class value) {
forward.put(key, value);
}
/**
* Returns the corresponding wrapper type of {@code type} if it is a primitive
* type; otherwise returns {@code type} itself. Idempotent.
*
* wrap(int.class) == Integer.class
* wrap(Integer.class) == Integer.class
* wrap(String.class) == String.class
*
*/
public static Class wrap(Class type) {
checkNotNull(type);
// cast is safe: long.class and Long.class are both of type Class
@SuppressWarnings("unchecked")
Class wrapped = (Class) PRIMITIVE_TO_WRAPPER_TYPE.get(type);
return (wrapped == null) ? type : wrapped;
}
}