ObjectUtils.java Source code

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Here is the source code for ObjectUtils.java

Source

import java.lang.reflect.Array;
import java.util.Arrays;

/*
 * Copyright 2002-2007 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.
 */

//Revised from springframework

/**
 * Miscellaneous object utility methods. Mainly for internal use within the
 * framework; consider Jakarta's Commons Lang for a more comprehensive suite
 * of object utilities.
 *
 * @author Juergen Hoeller
 * @author Keith Donald
 * @author Rod Johnson
 * @author Rob Harrop
 * @author Alex Ruiz
 * @since 19.03.2004
 * @see org.apache.commons.lang.ObjectUtils
 */
abstract class ObjectUtils {

    private static final int INITIAL_HASH = 7;
    private static final int MULTIPLIER = 31;

    private static final String EMPTY_STRING = "";
    private static final String NULL_STRING = "null";
    private static final String ARRAY_START = "{";
    private static final String ARRAY_END = "}";
    private static final String EMPTY_ARRAY = ARRAY_START + ARRAY_END;
    private static final String ARRAY_ELEMENT_SEPARATOR = ", ";

    /**
     * Check whether the given exception is compatible with the exceptions
     * declared in a throws clause.
     * @param ex the exception to checked
     * @param declaredExceptions the exceptions declared in the throws clause
     * @return whether the given exception is compatible
     */
    public static boolean isCompatibleWithThrowsClause(Throwable ex, Class[] declaredExceptions) {
        if (!isCheckedException(ex)) {
            return true;
        }
        if (declaredExceptions != null) {
            for (int i = 0; i < declaredExceptions.length; i++) {
                if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
                    return true;
                }
            }
        }
        return false;
    }

    /**
     * Return whether the given throwable is a checked exception:
     * that is, neither a RuntimeException nor an Error.
     * @param ex the throwable to check
     * @return whether the throwable is a checked exception
     * @see java.lang.Exception
     * @see java.lang.RuntimeException
     * @see java.lang.Error
     */
    public static boolean isCheckedException(Throwable ex) {
        return !(ex instanceof RuntimeException || ex instanceof Error);
    }

}