Moved TransportObjectSupport to xml module.

xml/src/main/java/org/springframework/xml/transform/TransformerObjectSupport.java

@@ -0,0 +1,59 @@
+/*
+ * Copyright 2006 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.springframework.xml.transform;
+
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerConfigurationException;
+import javax.xml.transform.TransformerFactory;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * Convenient base class for objects that use a <code>Transformer</code>. Subclasses can call
+ * <code>createTransformer</code> to obtain a transformer. This should be done per thread (i.e. per incoming request),
+ * because <code>Transformer</code> instances are not thread-safe.
+ *
+ * @author Arjen Poutsma
+ * @see Transformer
+ * @see #createTransformer()
+ */
+public abstract class TransformerObjectSupport {
+
+    /**
+     * Logger available to subclasses.
+     */
+    protected final Log logger = LogFactory.getLog(getClass());
+
+    private static TransformerFactory transformerFactory;
+
+    static {
+        transformerFactory = TransformerFactory.newInstance();
+    }
+
+    /**
+     * Creates a new <code>Transformer</code>. Must be called per request, as transformer is not thread-safe.
+     *
+     * @return the created transformer
+     * @throws TransformerConfigurationException
+     *          if thrown by JAXP methods
+     */
+    protected final Transformer createTransformer() throws TransformerConfigurationException {
+        return transformerFactory.newTransformer();
+    }
+
+}