org.apache.solr.client.solrj.io.ops

类 ReplaceOperation

java.lang.Object

org.apache.solr.client.solrj.io.ops.ReplaceOperation

所有已实现的接口:

Serializable, StreamOperation, Expressible

public class ReplaceOperation
extends Object
implements StreamOperation

Replaces some tuple value with another. The replacement value can be either a given value or the value of another field in the tuple. The expression for a replace operation can be of multiple forms: replace(fieldA, 0, withValue=100) // for fieldA if equals 0 then set to 100 replace(fieldA, null, withValue=0) // for fieldA if null then set to 0 replace(fieldA, null, withField=fieldB) // for fieldA if null then set to the value of fieldB (if fieldB is null then fieldA will end up as null) replace(fieldA, 0, withField=fieldB) // for fieldA if 0 then set to the value of fieldB (if fieldB is 0 then fieldA will end up as 0) replace(fieldA, "Izzy and Kayden", withValue="my kids") You can also construct these without the field name in the expression but that does require that you provide the field name during construction. This is most useful during metric calculation because when calculating a metric you have already provided a field name in the metric so there is no reason to have to provide the field name again in the operation sum(fieldA, replace(null, withValue=0)) // performs the replacement on fieldA Equality is determined by the standard type .equals() functions.

另请参阅:

序列化表格

构造器概要

构造器

构造器和说明
ReplaceOperation(StreamExpression expression, StreamFactory factory)
ReplaceOperation(String forField, StreamExpression expression, StreamFactory factory)

方法概要

限定符和类型	方法和说明
void	operate(Tuple tuple)
Explanation	toExplanation(StreamFactory factory) Returns an explanation about the stream object
StreamExpressionParameter	toExpression(StreamFactory factory)

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ReplaceOperation

public ReplaceOperation(StreamExpression expression,
                        StreamFactory factory)
                 throws IOException

抛出:

IOException

ReplaceOperation

public ReplaceOperation(String forField,
                        StreamExpression expression,
                        StreamFactory factory)
                 throws IOException

抛出:

IOException

方法详细资料

operate

public void operate(Tuple tuple)

指定者:

operate 在接口中 StreamOperation

toExpression

public StreamExpressionParameter toExpression(StreamFactory factory)
                                       throws IOException

指定者:

toExpression 在接口中 Expressible

抛出:

IOException

toExplanation

public Explanation toExplanation(StreamFactory factory)
                          throws IOException

从接口复制的说明: Expressible

Returns an explanation about the stream object

指定者:

toExplanation 在接口中 Expressible

参数:

factory - Stream factory for this, contains information about the function name

返回:

Explanation about this stream object containing explanations of any child stream objects

抛出:

IOException - throw on any error