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Add identityToString

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Make constructor public in line with NumberUtils and StringUtils
Javadoc tidy


git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137038 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2002-09-18 19:49:08 +00:00
parent 593e15d717
commit a6dfea71c6
1 changed files with 38 additions and 16 deletions
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50
src/java/org/apache/commons/lang/ObjectUtils.java
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@ -61,22 +61,27 @@
* @author <a href="mailto:janekdb@yahoo.co.uk">Janek Bogucki</a> * @author <a href="mailto:janekdb@yahoo.co.uk">Janek Bogucki</a>
* @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a> * @author <a href="mailto:dlr@finemaltcoding.com">Daniel Rall</a>
* @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a> * @author <a href="mailto:scolebourne@joda.org">Stephen Colebourne</a>
* @version $Id: ObjectUtils.java,v 1.1 2002/07/19 03:35:54 bayard Exp $ * @version $Id: ObjectUtils.java,v 1.2 2002/09/18 19:49:08 scolebourne Exp $
*/ */
public class ObjectUtils { public class ObjectUtils {
/** /**
* Prevent construction of ObjectUtils instances * ObjectUtils instances should NOT be constructed in standard programming.
* Instead, the class should be used as <code>ObjectUtils.defaultIfNull("a","b");</code>.
* This constructor is public to permit tools that require a JavaBean instance
* to operate.
*/ */
private ObjectUtils() { public ObjectUtils() {
} }
//--------------------------------------------------------------------
/** /**
* Returns a default value if the object passed is null. * Returns a default value if the object passed is null.
* *
* @param object the object to test. * @param object the object to test
* @param defaultValue the default value to return. * @param defaultValue the default value to return
* @return object if it is not null, defaultValue otherwise. * @return object if it is not null, defaultValue otherwise
*/ */
public static Object defaultIfNull(Object object, Object defaultValue) { public static Object defaultIfNull(Object object, Object defaultValue) {
return (object != null ? object : defaultValue); return (object != null ? object : defaultValue);
@ -86,19 +91,36 @@ public static Object defaultIfNull(Object object, Object defaultValue) {
* Compares two objects for equality, where either one or both * Compares two objects for equality, where either one or both
* objects may be <code>null</code>. * objects may be <code>null</code>.
* *
* @param object1 the first object. * @param object1 the first object
* @param object2 the second object. * @param object2 the second object
* @return True if the values of both objects are the same. * @return <code>true</code> if the values of both objects are the same
*/ */
public static boolean equals(Object object1, Object object2) { public static boolean equals(Object object1, Object object2) {
if (object1 == null) { if (object1 == object2) {
return (object2 == null); return true;
} else if (object2 == null) { }
// object1 is not null if ((object1 == null) || (object2 == null)) {
return false; return false;
} else { }
return object1.equals(object2); return object1.equals(object2);
} }
/**
* Gets the toString that would be produced by Object if a class did not
* override toString itself. Null will return null.
*
* @param object the object to create a toString for, may be null
* @return the default toString text, or null if null passed in
*/
public static String identityToString(Object object) {
if (object == null) {
return null;
}
return new StringBuffer()
.append(object.getClass().getName())
.append('@')
.append(Integer.toHexString(System.identityHashCode(object)))
.toString();
} }
} }