X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=router%2Fimpl%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fxmlrouter%2Fimpl%2FRobustTransformation.java;fp=router%2Fimpl%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fxmlrouter%2Fimpl%2FRobustTransformation.java;h=2fa025e005a836410517332d8f7ff2b3053ffbf7;hb=8e41cb29f75362a792292d21b481bd06a9506296;hp=0000000000000000000000000000000000000000;hpb=9dbc2844950b55ae552fe74840954ea71b754c7a;p=xmlrouter

diff --git a/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustTransformation.java b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustTransformation.java
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+++ b/router/impl/src/main/java/org/wamblee/xmlrouter/impl/RobustTransformation.java
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+/*
+ * 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));
+    }
+
+}