1 files changed, 50 insertions, 0 deletions
diff --git a/plugins/facet/org.eclipse.papyrus.emf.facet.util.core/src/org/eclipse/emf/facet/util/core/internal/ErrorHandlingUtils.java b/plugins/facet/org.eclipse.papyrus.emf.facet.util.core/src/org/eclipse/emf/facet/util/core/internal/ErrorHandlingUtils.java
new file mode 100644
index 00000000000..587ec1e2370
--- /dev/null
+++ b/plugins/facet/org.eclipse.papyrus.emf.facet.util.core/src/org/eclipse/emf/facet/util/core/internal/ErrorHandlingUtils.java
@@ -0,0 +1,50 @@
+/*******************************************************************************
+ * Copyright (c) 2011 Mia-Software
+ * 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:
+ *     Nicolas Bros (Mia-Software) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.emf.facet.util.core.internal;
+
+public final class ErrorHandlingUtils {
+	private ErrorHandlingUtils() {
+		// utility class
+	}
+
+	/**
+	 * Builds an error message for when an element doesn't have the expected type.
+	 *
+	 * @param baseMessage
+	 *            the beginning of the message
+	 * @param expectedType
+	 *            the expected type
+	 * @param element
+	 *            the element that doesn't match the expected type
+	 * @return the full message
+	 */
+	public static String buildWrongTypeMessage(final String baseMessage, final Class<?> expectedType, final Object element) {
+		StringBuilder builder = new StringBuilder();
+		builder.append(baseMessage);
+		builder.append("\n"); //$NON-NLS-1$
+		if (expectedType != null) {
+			builder.append("Expected type: "); //$NON-NLS-1$
+			builder.append(expectedType.getName());
+			builder.append(". "); //$NON-NLS-1$
+		} else {
+			builder.append("Expected type is null. "); //$NON-NLS-1$
+		}
+
+		if (element != null) {
+			builder.append("Got an instance of type: "); //$NON-NLS-1$
+			builder.append(element.getClass().getName());
+			builder.append("."); //$NON-NLS-1$
+		} else {
+			builder.append("Got null."); //$NON-NLS-1$
+		}
+		return builder.toString();
+	}
+}