Merge remote-tracking branch 'origin/master' into 4191

Signed-off-by: Andreas Bayha <bayha@fortiss.org>

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/extension/exception/.ratings

+AllChainTransformationsFailedException.java 6ed750cd9e9f58ecaf479c928840f90134d91b7e GREEN
 ChainTransformationFailedException.java a85fc087751bdf2c46d4ca0ff25e5369a18899a0 GREEN
 TransformationFailedException.java b79fdca068089c973d8a06161dc3a3bbb6e0635e GREEN

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/extension/exception/AllChainTransformationsFailedException.java

+/*-------------------------------------------------------------------------+
+| Copyright 2021 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.kernel.extension.exception;
+
+import java.util.List;
+
+import org.eclipse.emf.ecore.EObject;
+import org.fortiss.tooling.kernel.extension.data.ITransformationContext;
+import org.fortiss.tooling.kernel.utils.TransformationUtils;
+
+/**
+ * An exception thrown by
+ * {@link TransformationUtils#createTransformedObjectFor(EObject, Class, ITransformationContext)}
+ * if all chain transformations fail, keeping track of all exceptions thrown by each failed
+ * provider.
+ * 
+ * @author muntean
+ */
+public class AllChainTransformationsFailedException extends ChainTransformationFailedException {
+
+	/** Number of tabs initially used when returning the exception's message. */
+	private final int INITIAL_TABS = 0;
+
+	/** Stores the {@link ChainTransformationFailedException}s thrown by each failed provider. */
+	private final List<ChainTransformationFailedException> exceptionList;
+
+	/** Constructor. */
+	public AllChainTransformationsFailedException(
+			List<ChainTransformationFailedException> exceptionList) {
+		super(null, null, null, null);
+		this.exceptionList = exceptionList;
+	}
+
+	/** {@inheritDoc} */
+	@Override
+	public String getMessage() {
+		return getMessage(INITIAL_TABS);
+	}
+
+	/**
+	 * Recursive method iterating through the caught {@link TransformationFailedException}s
+	 * backtracking to the source of the error by examining the cause of the exceptions.
+	 * 
+	 * @param counter
+	 *            Number of tabs used in the current recursive step.
+	 * @return Message expressing the failed provider + cause.
+	 */
+	private String getMessage(int counter) {
+		String msg = "";
+		String tabs = addTabs(counter);
+		for(TransformationFailedException ctfe : this.exceptionList) {
+			msg += tabs + "Failed Provider:\n";
+			msg += tabs + ctfe.getFailedProvider().getClass().getSimpleName() + "\n";
+
+			// Here, the cause is either a...
+			// ... ChainTransformationsFailedException or an
+			// ... AllChainTransformationsFailedException.
+			TransformationFailedException cause = (TransformationFailedException)ctfe.getCause();
+			if(cause != null) {
+				msg += tabs + "Cause:\n";
+				if(cause instanceof AllChainTransformationsFailedException)
+					msg += ((AllChainTransformationsFailedException)cause).getMessage(counter + 1) +
+							"\n";
+				else
+					msg += tabs + cause.getMessage() + "\n";
+			}
+		}
+		return msg;
+	}
+
+	/** Returns a string with as many tabs as specified by the parameter. */
+	private String addTabs(int counter) {
+		String msg = "";
+		for(int i = 0; i < counter; i++) {
+			msg += "\t";
+		}
+		return msg;
+	}
+
+	/** Returns the list {@link ChainTransformationFailedException}s. */
+	public List<ChainTransformationFailedException> getExceptionList() {
+		return exceptionList;
+	}
+}

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/utils/.ratings

@@ -11,5 +11,5 @@ KernelServiceBasedModelListenerBase.java 8d916509ae75f7118ce72564ee715c46556fb70
 LoggingUtils.java 0e0aa5d466d80ea29cfc7e91178b23a5cdd4ddf7 GREEN
 PrototypesUtils.java ec75bed75cfc5103f1f38e3a29df86f729428775 GREEN
 ResourceUtils.java 1388e642ceeead4c8852e7ae39c6d57a362d4845 GREEN
-TransformationUtils.java 552d3a9d56d34450be781af828efe0b8aa5d359e GREEN
+TransformationUtils.java a060ec8a20c53a3c4996dd2628d194181e7d9ec3 GREEN
 UniqueIDUtils.java 665955b1790c1bd1c2087e23114da920bfec2265 GREEN

org.fortiss.tooling.kernel/src/org/fortiss/tooling/kernel/utils/TransformationUtils.java

@@ -17,11 +17,13 @@ package org.fortiss.tooling.kernel.utils;
 
 import static org.eclipse.core.runtime.Assert.isNotNull;
 
+import java.util.ArrayList;
 import java.util.List;
 
 import org.eclipse.emf.ecore.EObject;
 import org.fortiss.tooling.kernel.extension.data.ITransformationContext;
 import org.fortiss.tooling.kernel.extension.data.TransformationProviderChain;
+import org.fortiss.tooling.kernel.extension.exception.AllChainTransformationsFailedException;
 import org.fortiss.tooling.kernel.extension.exception.ChainTransformationFailedException;
 import org.fortiss.tooling.kernel.service.ITransformationService;
 
@@ -52,6 +54,8 @@ public final class TransformationUtils {
 			throws ChainTransformationFailedException {
 		List<TransformationProviderChain> chainList = ITransformationService.getInstance()
 				.getTransformationProviderChain(sourceElement.getClass(), targetClass, context);
+		// Stores the ChainTransformationFailedExceptions thrown by each failed provider.
+		List<ChainTransformationFailedException> exceptionList = new ArrayList<>();
 		if(!chainList.isEmpty()) {
 			for(TransformationProviderChain chain : chainList) {
 				try {
@@ -66,11 +70,14 @@ public final class TransformationUtils {
 							" ensure correct operation of all involved TransformationProviders.");
 					return executableObject;
 				} catch(ChainTransformationFailedException ctfe) {
-					// fall through
+					exceptionList.add(ctfe);
 				}
 			}
 		}
-		throw new NoTransformationChainFound(sourceElement, targetClass);
+		if(exceptionList.isEmpty())
+			throw new NoTransformationChainFound(sourceElement, targetClass);
+
+		throw new AllChainTransformationsFailedException(exceptionList);
 	}
 
 	/** Exception thrown when no transformation chain was found. */