Added XmlPayloadMarshallingTransformer delegating to a Spring OXM Marshaller and/or Unmarshaller (INT-109).

org.springframework.integration.xml/src/test/java/org/springframework/integration/xml/transformer/XmlPayloadMarshallingTransformerTests.java

@@ -0,0 +1,86 @@
+/*
+ * Copyright 2002-2008 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.integration.xml.transformer;
+
+import static org.junit.Assert.assertEquals;
+
+import java.io.IOException;
+
+import javax.xml.transform.Result;
+import javax.xml.transform.Source;
+
+import org.junit.Test;
+
+import org.springframework.integration.message.GenericMessage;
+import org.springframework.integration.message.Message;
+import org.springframework.integration.message.StringMessage;
+import org.springframework.oxm.Marshaller;
+import org.springframework.oxm.Unmarshaller;
+import org.springframework.oxm.XmlMappingException;
+import org.springframework.xml.transform.StringResult;
+import org.springframework.xml.transform.StringSource;
+
+/**
+ * @author Mark Fisher
+ */
+public class XmlPayloadMarshallingTransformerTests {
+
+	@Test
+	public void testStringToStringResult() {
+		Marshaller marshaller = new TestMarshaller();
+		XmlPayloadMarshallingTransformer transformer = new XmlPayloadMarshallingTransformer(marshaller);
+		Message<?> message = new StringMessage("world");
+		transformer.transform(message);
+		assertEquals(StringResult.class, message.getPayload().getClass());
+		assertEquals("hello world", message.getPayload().toString());
+	}
+
+	@Test
+	public void testStringSourceToString() {
+		Marshaller marshaller = new TestMarshaller();
+		XmlPayloadMarshallingTransformer transformer = new XmlPayloadMarshallingTransformer(marshaller);
+		Message<?> message = new GenericMessage<StringSource>(new StringSource("world"));
+		transformer.transform(message);
+		assertEquals(String.class, message.getPayload().getClass());
+		assertEquals("hello world", message.getPayload().toString());
+	}
+
+
+	private static class TestMarshaller implements Marshaller, Unmarshaller {
+
+		@SuppressWarnings("unchecked")
+		public boolean supports(Class clazz) {
+			return true;
+		}
+
+		public void marshal(Object originalPayload, Result result) throws XmlMappingException, IOException {
+			if (result instanceof StringResult) {
+				((StringResult) result).getWriter().write("hello " + originalPayload);
+			}
+		}
+
+		public Object unmarshal(Source source) throws XmlMappingException, IOException {
+			if (source instanceof StringSource) {
+				char[] chars = new char[8];
+				((StringSource) source).getReader().read(chars);
+				return "hello " + new String(chars).trim();
+			}
+			return null;
+		}
+	}
+
+}