sandbox/yajcache/src/org/apache/jcs/yajcache/util/ClassUtils.java

/*
 * Copyright 2005 The Apache Software Foundation.
 *
 * 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.apache.jcs.yajcache.util;

import java.math.BigDecimal;
import java.math.BigInteger;

import org.apache.jcs.yajcache.lang.annotation.*;
/**
 *
 * @author Hanson Char
 */
// @CopyRightApache
// http://www.netbeans.org/issues/show_bug.cgi?id=53704
public enum ClassUtils {
    inst;
    /** 
     * Returns true if instances of the given class is known to be immutable; 
     * false if we don't know.
     */
    public boolean isImmutable(@NonNullable Class t) {
        return t == String.class
        ||  t.isPrimitive()
        ||  t == Boolean.class
        ||  t == Byte.class
        ||  t == Character.class
        ||  t == Short.class
        ||  t == Integer.class
        ||  t == Long.class
        ||  t == Float.class
        ||  t == Double.class
        ||  t == BigInteger.class
        ||  t == BigDecimal.class
        ||  t.isEnum()
        ;
    }
    public boolean isImmutable(@NonNullable Object obj) {
        return this.isImmutable(obj.getClass());
    }
}