public class FieldValueEvaluator extends SourceEvaluator
nodeId, streamContext| 构造器和说明 |
|---|
FieldValueEvaluator(String fieldName) |
| 限定符和类型 | 方法和说明 |
|---|---|
Object |
evaluate(Tuple tuple) |
Explanation |
toExplanation(StreamFactory factory)
Returns an explanation about the stream object
|
StreamExpressionParameter |
toExpression(StreamFactory factory) |
getStreamContext, setStreamContextclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitevaluateOverContextpublic FieldValueEvaluator(String fieldName)
public Object evaluate(Tuple tuple) throws IOException
IOExceptionpublic StreamExpressionParameter toExpression(StreamFactory factory) throws IOException
IOExceptionpublic Explanation toExplanation(StreamFactory factory) throws IOException
Expressiblefactory - Stream factory for this, contains information about the function nameIOException - throw on any errorCopyright © 2006–2022 The Apache Software Foundation. All rights reserved.