[289664] fix handling of missing platform or connection

1 files changed, 56 insertions, 0 deletions

diff --git a/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/NotBooleanTransformer.java b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/NotBooleanTransformer.java
new file mode 100644
index 0000000000..998f22a674
--- /dev/null
+++ b/jpa/plugins/org.eclipse.jpt.utility/src/org/eclipse/jpt/utility/internal/NotBooleanTransformer.java
@@ -0,0 +1,56 @@
+/*******************************************************************************
+ * Copyright (c) 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.
+ * 
+ * Contributors:
+ *     Oracle - initial API and implementation
+ ******************************************************************************/
+package org.eclipse.jpt.utility.internal;
+
+/**
+ * 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 class NotBooleanTransformer
+	implements BidiTransformer<Boolean, Boolean>
+{
+	public static final BidiTransformer<Boolean, Boolean> INSTANCE = new NotBooleanTransformer();
+
+	public static BidiTransformer<Boolean, Boolean> instance() {
+		return INSTANCE;
+	}
+
+	// ensure single instance
+	private NotBooleanTransformer() {
+		super();
+	}
+
+	public Boolean transform(Boolean b) {
+		return (b == null) ? null : BooleanTools.not(b);
+	}
+
+	public Boolean reverseTransform(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;
+	}
+
+}