org.springframework.util.ObjectUtils Maven / Gradle / Ivy
/*
* Copyright 2002-2004 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.
*/
package org.springframework.util;
/**
* 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
* @since 19.03.2004
* @see org.apache.commons.lang.ObjectUtils
*/
public abstract class ObjectUtils {
/**
* Determine if the given objects are equal, returning true if both are null
* respectively false if only one is null.
* @param o1 first Object to compare
* @param o2 second Object to compare
* @return whether the given objects are equal
*/
public static boolean nullSafeEquals(Object o1, Object o2) {
return (o1 == o2 || (o1 != null && o1.equals(o2)));
}
/**
* Return a hex string form of an object's identity hash code.
* @param o the object
* @return the object's identity code in hex
*/
public static String getIdentityHexString(Object o) {
return Integer.toHexString(System.identityHashCode(o));
}
/**
* Return whether the given throwable is a checked exception,
* i.e. an Exception but not a RuntimeException.
* @param ex the throwable to check
* @return whether the throwable is a checked exception
* @see java.lang.Exception
* @see java.lang.RuntimeException
*/
public static boolean isCheckedException(Throwable ex) {
return (ex instanceof Exception) && (!(ex instanceof RuntimeException));
}
/**
* 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 (ex instanceof RuntimeException) {
return true;
}
if (declaredExceptions != null) {
for (int i = 0; i < declaredExceptions.length; i++) {
if (declaredExceptions[i].isAssignableFrom(ex.getClass())) {
return true;
}
}
}
return false;
}
}