removing AbstractHeaderTransformer since it is no longer used

org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractHeaderTransformer.java

@@ -1,46 +0,0 @@
-/*
- * 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.transformer;
-
-import java.util.HashMap;
-import java.util.Map;
-
-import org.springframework.integration.core.Message;
-import org.springframework.integration.core.MessagingException;
-import org.springframework.integration.message.MessageBuilder;
-
-/**
- * A base class for {@link Transformer} implementations that modify
- * the header values of a {@link Message}.
- * 
- * @author Mark Fisher
- */
-public abstract class AbstractHeaderTransformer implements Transformer {
-
-	public final Message<?> transform(Message<?> message) {
-		try {
-			Map<String, Object> headerMap = new HashMap<String, Object>(message.getHeaders());
-	        this.transformHeaders(headerMap);
-	        return MessageBuilder.withPayload(message.getPayload()).copyHeaders(headerMap).build();
-        } catch (Exception e) {
-        	throw new MessagingException(message, "failed to transform message headers", e);
-        }
-	}
-
-	protected abstract void transformHeaders(Map<String, Object> headers);
-
-}