diff options
Diffstat (limited to 'jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java')
| -rw-r--r-- | jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java index 79c2bab8e7..a77ef1155a 100644 --- a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java +++ b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/Transformer.java @@ -1,5 +1,5 @@ /******************************************************************************* - * Copyright (c) 2005, 2007 Oracle. All rights reserved. + * Copyright (c) 2005, 2010 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. @@ -25,6 +25,10 @@ public interface Transformer<T1, T2> { T2 transform(T1 o); + /** + * A "null" transformer will perform no transformation at all; + * it will simply return the object "untransformed". + */ final class Null<S1, S2> implements Transformer<S1, S2>, Serializable { @SuppressWarnings("unchecked") public static final Transformer INSTANCE = new Null(); @@ -52,6 +56,12 @@ public interface Transformer<T1, T2> { } } + /** + * A "disabled" transformer will throw an exception if + * {@link #transform(Object)} is called. This is useful in situations + * where a transformer is optional and the default transformer should + * not be used. + */ final class Disabled<S1, S2> implements Transformer<S1, S2>, Serializable { @SuppressWarnings("unchecked") public static final Transformer INSTANCE = new Disabled(); |