diff --git a/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractHeaderTransformer.java b/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractHeaderTransformer.java new file mode 100644 index 0000000000..c8fd9698e2 --- /dev/null +++ b/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractHeaderTransformer.java @@ -0,0 +1,46 @@ +/* + * 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.message.Message; +import org.springframework.integration.message.MessageBuilder; +import org.springframework.integration.message.MessagingException; + +/** + * 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 headerMap = new HashMap(message.getHeaders()); + this.transformHeaders(headerMap); + return MessageBuilder.fromPayload(message.getPayload()).copyHeaders(headerMap).build(); + } catch (Exception e) { + throw new MessagingException(message, "failed to transform message headers", e); + } + } + + protected abstract void transformHeaders(Map headers); + +} diff --git a/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractPayloadTransformer.java b/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractPayloadTransformer.java new file mode 100644 index 0000000000..5f52c73663 --- /dev/null +++ b/org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractPayloadTransformer.java @@ -0,0 +1,43 @@ +/* + * 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 org.springframework.integration.message.Message; +import org.springframework.integration.message.MessageBuilder; +import org.springframework.integration.message.MessagingException; + +/** + * A base class for {@link Transformer} implementations that modify + * the payload of a {@link Message}. + * + * @author Mark Fisher + */ +public abstract class AbstractPayloadTransformer implements Transformer { + + public final Message transform(Message message) { + try { + @SuppressWarnings("unchecked") + U result = this.transformPayload((T) message.getPayload()); + return MessageBuilder.fromPayload(result).copyHeaders(message.getHeaders()).build(); + } catch (Exception e) { + throw new MessagingException(message, "failed to transform message payload", e); + } + } + + protected abstract U transformPayload(T payload) throws Exception; + +}