cleaning the code, a better packaging and more reuse

refs 233

org.fortiss.tooling.base.ui/trunk/META-INF/MANIFEST.MF

@@ -13,6 +13,7 @@ Export-Package: org.fortiss.tooling.base.ui,
  org.fortiss.tooling.base.ui.action,
  org.fortiss.tooling.base.ui.command,
  org.fortiss.tooling.base.ui.compose,
+ org.fortiss.tooling.base.ui.contentprovider,
  org.fortiss.tooling.base.ui.dnd,
  org.fortiss.tooling.base.ui.editor,
  org.fortiss.tooling.base.ui.editor.gef,

org.fortiss.tooling.base.ui/trunk/src/org/fortiss/tooling/base/ui/contentprovider/TreeContentProviderBase.java

+/*--------------------------------------------------------------------------+
+$Id: codetemplates.xml 1 2011-01-01 00:00:01Z hoelzl $
+|                                                                          |
+| Copyright 2011 ForTISS GmbH                     |
+|                                                                          |
+| Licensed under the Apache License, Version 2.0 (the "License");          |
+| you may not use this file except in compliance with the License.         |
+| You may obtain a copy of the License at                                  |
+|                                                                          |
+|    http://www.apache.org/licenses/LICENSE-2.0                            |
+|                                                                          |
+| Unless required by applicable law or agreed to in writing, software      |
+| distributed under the License is distributed on an "AS IS" BASIS,        |
+| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
+| See the License for the specific language governing permissions and      |
+| limitations under the License.                                           |
++--------------------------------------------------------------------------*/
+package org.fortiss.tooling.base.ui.contentprovider;
+
+import org.eclipse.jface.viewers.ITreeContentProvider;
+import org.eclipse.jface.viewers.Viewer;
+
+/**
+ * Base implementation of a tree content provider that has an empty default
+ * implementation for some methods. Some of the methods require implementation
+ * almost always (e.g. {@link #getElements(Object)} and
+ * {@link #getParent(Object)}), but for simple content providers the base
+ * implementation is sufficient.
+ * 
+ * This class is taken from ConQAT.
+ * 
+ * @author hummelb
+ * @author $Author: deissenb $
+ * @version $Rev: 34252 $
+ * @ConQAT.Rating RED Hash:
+ */
+public abstract class TreeContentProviderBase implements ITreeContentProvider {
+
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * Default implementation returns null, which makes automatic expansion of
+	 * externally set selection impossible.
+	 */
+	@Override
+	public Object getParent(Object inputElement) {
+		return null;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * Uses the result of {@link #getChildren(Object)} to determine result.
+	 */
+	@Override
+	public boolean hasChildren(Object inputElement) {
+		Object[] children = getChildren(inputElement);
+		return children != null && children.length > 0;
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * Just calls {@link #getChildren(Object)}.
+	 */
+	@Override
+	public Object[] getElements(Object inputElement) {
+		return getChildren(inputElement);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * Empty implementation.
+	 */
+	@Override
+	public void dispose() {
+		// not needed
+	}
+
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * Empty implementation.
+	 */
+	@Override
+	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
+		// not needed
+	}
+}
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