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INT-903

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This commit is contained in:
Mark Fisher
2009-12-10 23:36:59 +00:00
parent 6246779e66
commit c639753dd9
2 changed files with 46 additions and 7 deletions
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16
org.springframework.integration/src/main/java/org/springframework/integration/transformer/AbstractTransformer.java
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@@ -20,9 +20,7 @@ import org.springframework.integration.core.Message;
import org.springframework.integration.message.MessageBuilder;
/**
* A base class for {@link Transformer} implementations. If the return value is
* itself a Message, it will be used as the result. Otherwise, the return value
* will be used as the payload of the result Message.
* A base class for {@link Transformer} implementations.
*
* @author Mark Fisher
*/
@@ -32,8 +30,10 @@ public abstract class AbstractTransformer implements Transformer {
public final Message<?> transform(Message<?> message) {
try {
Object result = this.doTransform(message);
return (result instanceof Message)
? MessageBuilder.fromMessage((Message<?>) result).build()
if (result == null) {
return null;
}
return (result instanceof Message) ? (Message<?>) result
: MessageBuilder.withPayload(result).copyHeaders(message.getHeaders()).build();
}
catch (MessageTransformationException e) {
@@ -44,6 +44,12 @@ public abstract class AbstractTransformer implements Transformer {
}
}
/**
* Subclasses must implement this method to provide the transformation
* logic. If the return value is itself a Message, it will be used as the
* result. Otherwise, any non-null return value will be used as the payload
* of the result Message.
*/
protected abstract Object doTransform(Message<?> message) throws Exception;
}