a new utility method pickInstanceOf(Collection<Class> targetClasses, List<S> sourceElements)

refs 311

org.fortiss.tooling.kernel/trunk/src/org/fortiss/tooling/kernel/utils/EcoreUtils.java

@@ -17,6 +17,8 @@ $Id: codetemplates.xml 1 2011-01-01 00:00:01Z hoelzl $
 +--------------------------------------------------------------------------*/
 package org.fortiss.tooling.kernel.utils;
 
+import java.util.Collection;
+
 import org.eclipse.emf.common.util.BasicEList;
 import org.eclipse.emf.common.util.ECollections;
 import org.eclipse.emf.common.util.EList;
@@ -28,7 +30,7 @@ import org.eclipse.emf.common.util.EList;
  * @author ratiu
  * @author $Author: hoelzl $
  * @version $Rev: 18709 $
- * @ConQAT.Rating GREEN Hash: BB06B0A08486E75019A90CE8468CCDCA
+ * @ConQAT.Rating YELLOW Hash: 51B869B8A1DFDD5FB34EB9FE8677057F
  */
 public class EcoreUtils {
 
@@ -73,6 +75,37 @@ public class EcoreUtils {
 		return ECollections.unmodifiableEList(result);
 	}
 
+	/**
+	 * From a given EList with source objects of type S create another
+	 * unmodifiable EList with objects of one of the types given by the
+	 * parameter targetClasses, whereby those types are a sub-type of S. The
+	 * resulting EList is unmodifiable thereby it represents only a view over
+	 * the source list.
+	 * 
+	 * @param targetClasses
+	 *            - a collection of classes representing types of elements to be
+	 *            picked
+	 * @param sourceList
+	 *            - an EList with objects of type S
+	 * @return an unmodifiable EList of objects of type S containing only the
+	 *         targetClasses instances
+	 */
+	public static <S> EList<S> pickInstanceOf(
+			Collection<Class<?>> targetClasses, EList<S> sourceList) {
+		if (sourceList == null)
+			return null;
+		EList<S> result = new BasicEList<S>();
+		for (S sourceElement : sourceList) {
+			Class<?> sourceClass = sourceElement.getClass();
+			for (Class<?> targetClass : targetClasses) {
+				if (targetClass.isAssignableFrom(sourceClass)) {
+					result.add(sourceElement);
+				}
+			}
+		}
+		return ECollections.unmodifiableEList(result);
+	}
+
 	/**
 	 * From a given EList with source objects of type S pick the first object
 	 * with type T, whereby T is a sub-type of S.