jersey.repackaged.com.google.common.primitives.Primitives Maven / Gradle / Ivy
/*
* 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 jersey.repackaged.com.google.common.primitives;
import static jersey.repackaged.com.google.common.base.Preconditions.checkNotNull;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
/**
* Contains static utility methods pertaining to primitive types and their
* corresponding wrapper types.
*
* @author Kevin Bourrillion
* @since 1.0
*/
public final class Primitives {
private Primitives() {}
/** A map from primitive types to their corresponding wrapper types. */
private static final Map, Class> PRIMITIVE_TO_WRAPPER_TYPE;
/** A map from wrapper types to their corresponding primitive types. */
private static final Map, Class> WRAPPER_TO_PRIMITIVE_TYPE;
// Sad that we can't use a BiMap. :(
static {
Map, Class> primToWrap = new HashMap, Class>(16);
Map, Class> wrapToPrim = new HashMap, Class>(16);
add(primToWrap, wrapToPrim, boolean.class, Boolean.class);
add(primToWrap, wrapToPrim, byte.class, Byte.class);
add(primToWrap, wrapToPrim, char.class, Character.class);
add(primToWrap, wrapToPrim, double.class, Double.class);
add(primToWrap, wrapToPrim, float.class, Float.class);
add(primToWrap, wrapToPrim, int.class, Integer.class);
add(primToWrap, wrapToPrim, long.class, Long.class);
add(primToWrap, wrapToPrim, short.class, Short.class);
add(primToWrap, wrapToPrim, void.class, Void.class);
PRIMITIVE_TO_WRAPPER_TYPE = Collections.unmodifiableMap(primToWrap);
WRAPPER_TO_PRIMITIVE_TYPE = Collections.unmodifiableMap(wrapToPrim);
}
private static void add(Map, Class> forward,
Map, Class> backward, Class key, Class value) {
forward.put(key, value);
backward.put(value, key);
}
/**
* Returns an immutable set of all nine primitive types (including {@code
* void}). Note that a simpler way to test whether a {@code Class} instance
* is a member of this set is to call {@link Class#isPrimitive}.
*
* @since 3.0
*/
public static Set> allPrimitiveTypes() {
return PRIMITIVE_TO_WRAPPER_TYPE.keySet();
}
/**
* Returns an immutable set of all nine primitive-wrapper types (including
* {@link Void}).
*
* @since 3.0
*/
public static Set> allWrapperTypes() {
return WRAPPER_TO_PRIMITIVE_TYPE.keySet();
}
/**
* Returns {@code true} if {@code type} is one of the nine
* primitive-wrapper types, such as {@link Integer}.
*
* @see Class#isPrimitive
*/
public static boolean isWrapperType(Class type) {
return WRAPPER_TO_PRIMITIVE_TYPE.containsKey(checkNotNull(type));
}
/**
* 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;
}
/**
* Returns the corresponding primitive type of {@code type} if it is a
* wrapper type; otherwise returns {@code type} itself. Idempotent.
* * unwrap(Integer.class) == int.class
* unwrap(int.class) == int.class
* unwrap(String.class) == String.class
*
*/
public static Class unwrap(Class type) {
checkNotNull(type);
// cast is safe: long.class and Long.class are both of type Class
@SuppressWarnings("unchecked")
Class unwrapped = (Class) WRAPPER_TO_PRIMITIVE_TYPE.get(type);
return (unwrapped == null) ? type : unwrapped;
}
}