--- /dev/null
+/*
+ * Copyright 2005-2011 the original author or authors.
+ *
+ * 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.wamblee.xmlrouter.impl;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+import javax.xml.transform.dom.DOMSource;
+
+import org.wamblee.xml.XMLDocument;
+import org.wamblee.xmlrouter.config.Transformation;
+
+/**
+ * This class provides robustness towards externally provided transformations.
+ *
+ * @author Erik Brakkee
+ *
+ */
+public class RobustTransformation extends RobustIdentifiable<Transformation>
+ implements Transformation {
+
+ private static final Logger LOGGER = Logger
+ .getLogger(RobustTransformation.class.getName());
+
+ private Transformation transformation;
+
+ /**
+ * Constructs the wrapper.
+ *
+ * @param aId
+ * Unique id.
+ * @param aTransformation
+ * Wrapped transformation.
+ */
+ public RobustTransformation(Transformation aTransformation) {
+ super(aTransformation);
+ transformation = aTransformation;
+ }
+
+ @Override
+ public String getFromType() {
+ try {
+ String from = transformation.getFromType();
+ if (from == null) {
+ logTypeReturnedNull("from");
+ return Constants.UNKNOWN_DOCUMENT_TYPE.toString();
+ }
+ return from;
+ } catch (Exception e) {
+ logTypeThrewException("from", e);
+ return Constants.UNKNOWN_DOCUMENT_TYPE.toString();
+ }
+ }
+
+ @Override
+ public String getToType() {
+ try {
+ String to = transformation.getToType();
+ if (to == null) {
+ logTypeReturnedNull("to");
+ return Constants.UNKNOWN_DOCUMENT_TYPE.toString();
+ }
+ return to;
+ } catch (Exception e) {
+ logTypeThrewException("to", e);
+ return Constants.UNKNOWN_DOCUMENT_TYPE.toString();
+ }
+ }
+
+ @Override
+ public DOMSource transform(DOMSource aDocument) {
+ try {
+ DOMSource res = transformation.transform(aDocument);
+ if (res == null) {
+ logTransformationReturnedNull(aDocument);
+ return null;
+ }
+ return res;
+ } catch (Exception e) {
+ logTranformationThrewException(aDocument, e);
+ return null;
+ }
+ }
+
+ private void logNameThrewException(Exception aE) {
+ LOGGER.log(Level.WARNING, "getName" +
+ " threw exception, returning default value " +
+ Constants.UNKNOWN_NAME, aE);
+ }
+
+ private void logTypeThrewException(String aFromTo, Exception aE) {
+ LOGGER.log(Level.WARNING, "get" + aFromTo +
+ " threw exception, returning default value " +
+ Constants.UNKNOWN_DOCUMENT_TYPE, aE);
+ }
+
+ private void logTypeReturnedNull(String aFromTo) {
+ LOGGER.log(Level.WARNING, "get" + aFromTo +
+ " returned null, returning default value " +
+ Constants.UNKNOWN_DOCUMENT_TYPE);
+ }
+
+ private void logTranformationThrewException(DOMSource aEvent, Exception aE) {
+ LOGGER.log(Level.WARNING,
+ "transformation " + getId() + " threw exception for event " +
+ new XMLDocument(aEvent).print(true), aE);
+ }
+
+ private void logTransformationReturnedNull(DOMSource aEvent) {
+ LOGGER.log(Level.WARNING, "transformation " + getId() +
+ " returned null for event " + new XMLDocument(aEvent).print(true));
+ }
+
+}