Added MessageFilter

spring-eai-core/src/main/java/org/springframework/integration/transformer/MessageFilter.java

@@ -0,0 +1,45 @@
+/*
+ * Copyright 2002-2007 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.transformer;
+
+import org.springframework.integration.handler.MessageHandler;
+import org.springframework.integration.message.Message;
+import org.springframework.integration.message.MessageSelector;
+
+/**
+ * Handler for deciding whether to pass a message. Implements
+ * {@link MessageHandler} and simply delegates to a {@link MessageSelector}.
+ * 
+ * @author Mark Fisher
+ */
+public class MessageFilter implements MessageHandler {
+
+	private MessageSelector selector;
+
+
+	public MessageFilter(MessageSelector selector) {
+		this.selector = selector;
+	}
+
+	public Message handle(Message message) {
+		if (this.selector.accept(message)) {
+			return message;
+		}
+		return null;
+	}
+
+}