adds compositor base for constraint instance containers

refs 2708

org.fortiss.tooling.base/trunk/src/org/fortiss/tooling/base/compose/ConstraintInstanceContainerCompositor.java

+/*--------------------------------------------------------------------------+
+$Id$
+|                                                                          |
+| 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.compose;
+
+import static org.eclipse.emf.ecore.util.EcoreUtil.delete;
+import static org.fortiss.tooling.base.utils.ConstraintsBaseUtils.removeFromConstraintInstanceContainer;
+
+import org.eclipse.emf.ecore.EObject;
+import org.fortiss.tooling.base.model.base.ConstraintInstanceContainer;
+import org.fortiss.tooling.kernel.extension.IElementCompositor;
+import org.fortiss.tooling.kernel.extension.data.IElementCompositionContext;
+import org.fortiss.tooling.kernel.extension.data.Prototype;
+import org.fortiss.tooling.kernel.model.constraints.ConstraintInstance;
+import org.fortiss.tooling.kernel.model.constraints.IConstraintInstanceContainer;
+
+/**
+ * {@link IElementCompositor} implementation for {@link ConstraintInstanceContainer}s.
+ * 
+ * @author hoelzl
+ * @author $Author$
+ * @version $Rev$
+ * @ConQAT.Rating YELLOW Hash: A67C7B2EE1682BEC369EEF27FF1FF200
+ */
+public class ConstraintInstanceContainerCompositor<CIC extends IConstraintInstanceContainer>
+		implements IElementCompositor<CIC> {
+
+	/** {@inheritDoc} */
+	@Override
+	public boolean canCompose(CIC container, EObject contained, IElementCompositionContext context) {
+		return contained instanceof ConstraintInstance;
+	}
+
+	/** {@inheritDoc} */
+	@Override
+	public boolean compose(CIC container, EObject contained, IElementCompositionContext context) {
+		ConstraintInstance c = (ConstraintInstance)contained;
+		container.getConstraintInstances().add(c);
+		return true;
+	}
+
+	/** {@inheritDoc} */
+	@Override
+	public boolean canComposePrototype(Prototype prototype) {
+		// As of now constraints should never be added by prototype.
+		return false;
+	}
+
+	/** {@inheritDoc} */
+	@Override
+	public boolean canDecompose(EObject contained) {
+		return contained instanceof ConstraintInstance;
+	}
+
+	/** {@inheritDoc} */
+	@Override
+	public boolean decompose(EObject contained) {
+		removeFromConstraintInstanceContainer((ConstraintInstance)contained);
+		delete(contained);
+		return true;
+	}
+}