blob: f49da717bcd4c708faf917486c7137df6355c698 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*******************************************************************************
* Copyright (c) 2010, 2012 Oracle. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0, which accompanies this distribution
* and is available at http://www.eclipse.org/legal/epl-v10.html.
*
* Contributors:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.utility.internal.transformer;
import java.io.Serializable;
import org.eclipse.jpt.common.utility.internal.BooleanTools;
import org.eclipse.jpt.common.utility.transformer.Transformer;
/**
* A <code>NotBooleanTransformer</code> will transform a
* {@link Boolean} to its NOT value:<ul>
* <li>If the original {@link Boolean} is {@link Boolean#TRUE},
* the transformer will return {@link Boolean#FALSE}.
* <li>If the original {@link Boolean} is {@link Boolean#FALSE},
* the transformer will return {@link Boolean#TRUE}.
* <li>If the original {@link Boolean} is <code>null</code>,
* the transformer will return <code>null</code>.
* </ul>
*/
public final class NotBooleanTransformer
implements Transformer<Boolean, Boolean>, Serializable
{
public static final Transformer<Boolean, Boolean> INSTANCE = new NotBooleanTransformer();
public static Transformer<Boolean, Boolean> instance() {
return INSTANCE;
}
// ensure single instance
private NotBooleanTransformer() {
super();
}
public Boolean transform(Boolean b) {
return (b == null) ? null : BooleanTools.not(b);
}
@Override
public String toString() {
return this.getClass().getSimpleName();
}
private static final long serialVersionUID = 1L;
private Object readResolve() {
// replace this object with the singleton
return INSTANCE;
}
}
|
