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Add negate(Boolean) method 

git-svn-id: https://svn.apache.org/repos/asf/jakarta/commons/proper/lang/trunk@137204 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Stephen Colebourne 2002-12-22 21:33:12 +00:00
parent 24968c2cfa
commit af15108a55
2 changed files with 27 additions and 2 deletions
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20
src/java/org/apache/commons/lang/BooleanUtils.java
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@ -58,7 +58,7 @@ package org.apache.commons.lang;
* boolean and Boolean objects.</p>
*
* @author Stephen Colebourne
* @version $Id: BooleanUtils.java,v 1.1 2002/12/15 16:55:32 scolebourne Exp $
* @version $Id: BooleanUtils.java,v 1.2 2002/12/22 21:33:12 scolebourne Exp $
*/
public class BooleanUtils {
@ -72,6 +72,24 @@ public class BooleanUtils {
public BooleanUtils() {
}
// Boolean utilities
//--------------------------------------------------------------------------
/**
* <p>Negates the specified boolean.</p>
*
* <p>If <code>null</code> is passed in, <code>null</code> will be returned.</p>
*
* @param bool the Boolean to negate, may be null
* @return the negated Boolean, or <code>null</code> if <code>null</code> passed in
*/
public static Boolean negate(Boolean bool) {
if (bool == null) {
return null;
}
return (bool.booleanValue() ? Boolean.FALSE : Boolean.TRUE);
}
// boolean Boolean methods
//--------------------------------------------------------------------------

9
src/test/org/apache/commons/lang/BooleanUtilsTest.java
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@ -61,7 +61,7 @@ import junit.textui.TestRunner;
* Unit tests {@link org.apache.commons.lang.BooleanUtils}.
*
* @author Stephen Colebourne
* @version $Id: BooleanUtilsTest.java,v 1.1 2002/12/15 16:55:32 scolebourne Exp $
* @version $Id: BooleanUtilsTest.java,v 1.2 2002/12/22 21:33:12 scolebourne Exp $
*/
public class BooleanUtilsTest extends TestCase {
@ -87,6 +87,13 @@ public class BooleanUtilsTest extends TestCase {
super.tearDown();
}
//-----------------------------------------------------------------------
public void test_negate_Boolean() {
assertSame(null, BooleanUtils.negate(null));
assertSame(Boolean.TRUE, BooleanUtils.negate(Boolean.FALSE));
assertSame(Boolean.FALSE, BooleanUtils.negate(Boolean.TRUE));
}
//-----------------------------------------------------------------------
public void test_toBooleanObject_boolean() {
assertSame(Boolean.TRUE, BooleanUtils.toBooleanObject(true));