javaparser-core/src/main/java/com/github/javaparser/utils/ClassUtils.java

/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2016 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */

package com.github.javaparser.utils;

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

public class ClassUtils {
    /**
     * Maps primitive {@code Class}es to their corresponding wrapper {@code Class}.
     */
    private static final Map<Class<?>, Class<?>> primitiveWrapperMap = new HashMap<>();

    static {
        primitiveWrapperMap.put(Boolean.TYPE, Boolean.class);
        primitiveWrapperMap.put(Byte.TYPE, Byte.class);
        primitiveWrapperMap.put(Character.TYPE, Character.class);
        primitiveWrapperMap.put(Short.TYPE, Short.class);
        primitiveWrapperMap.put(Integer.TYPE, Integer.class);
        primitiveWrapperMap.put(Long.TYPE, Long.class);
        primitiveWrapperMap.put(Double.TYPE, Double.class);
        primitiveWrapperMap.put(Float.TYPE, Float.class);
        primitiveWrapperMap.put(Void.TYPE, Void.TYPE);
    }

    /**
     * Maps wrapper {@code Class}es to their corresponding primitive types.
     */
    private static final Map<Class<?>, Class<?>> wrapperPrimitiveMap = new HashMap<>();

    static {
        for (final Class<?> primitiveClass : primitiveWrapperMap.keySet()) {
            final Class<?> wrapperClass = primitiveWrapperMap.get(primitiveClass);
            if (!primitiveClass.equals(wrapperClass)) {
                wrapperPrimitiveMap.put(wrapperClass, primitiveClass);
            }
        }
    }

    /**
     * Returns whether the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte},
     * {@link Character},
     * {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
     *
     * @param type The class to query or null.
     * @return true if the given {@code type} is a primitive or primitive wrapper ({@link Boolean}, {@link Byte}, {@link
     * Character}, {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
     */
    public static boolean isPrimitiveOrWrapper(final Class<?> type) {
        if (type == null) {
            return false;
        }
        return type.isPrimitive() || isPrimitiveWrapper(type);
    }

    /**
     * Returns whether the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
     * {@link Short},
     * {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
     *
     * @param type The class to query or null.
     * @return true if the given {@code type} is a primitive wrapper ({@link Boolean}, {@link Byte}, {@link Character},
     * {@link Short}, {@link Integer}, {@link Long}, {@link Double}, {@link Float}).
     * @since 3.1
     */
    public static boolean isPrimitiveWrapper(final Class<?> type) {
        return wrapperPrimitiveMap.containsKey(type);
    }
}