cascading.operation.regex
Class RegexSplitGenerator
java.lang.Object
cascading.operation.BaseOperation<C>
cascading.operation.regex.RegexOperation<Pair<Pattern,Tuple>>
cascading.operation.regex.RegexSplitGenerator
- All Implemented Interfaces:
- DeclaresResults, Function<Pair<Pattern,Tuple>>, Operation<Pair<Pattern,Tuple>>, Traceable, Serializable
public class RegexSplitGenerator
- extends RegexOperation<Pair<Pattern,Tuple>>
- implements Function<Pair<Pattern,Tuple>>
Class RegexGenerator will emit a new Tuple for every split on the incoming argument value delimited by the given patternString.
RegexGenerator only expects one field value. If more than one argument value is passed, only the
first is handled, the remainder are ignored.
This could be used to break a document into single word tuples for later processing for a word count.
Note a null
valued argument passed to the parser will be converted to an empty string (""
) before
the regex is applied.
Any Object value will be coerced to a String type if type information is provided. See the
CoercibleType
interface to control how custom Object types are converted to String
values.
- See Also:
- Serialized Form
Fields inherited from interface cascading.operation.Operation |
ANY |
RegexSplitGenerator
@ConstructorProperties(value="patternString")
public RegexSplitGenerator(String patternString)
- Constructor RegexGenerator creates a new RegexGenerator instance.
- Parameters:
patternString
- of type String
RegexSplitGenerator
@ConstructorProperties(value={"fieldDeclaration","patternString"})
public RegexSplitGenerator(Fields fieldDeclaration,
String patternString)
- Constructor RegexGenerator creates a new RegexGenerator instance.
- Parameters:
fieldDeclaration
- of type FieldspatternString
- of type String
prepare
public void prepare(FlowProcess flowProcess,
OperationCall<Pair<Pattern,Tuple>> operationCall)
- Description copied from class:
BaseOperation
- Method prepare does nothing, and may safely be overridden.
- Specified by:
prepare
in interface Operation<Pair<Pattern,Tuple>>
- Overrides:
prepare
in class BaseOperation<Pair<Pattern,Tuple>>
operate
public void operate(FlowProcess flowProcess,
FunctionCall<Pair<Pattern,Tuple>> functionCall)
- Description copied from interface:
Function
- Method operate provides the implementation of this Function.
- Specified by:
operate
in interface Function<Pair<Pattern,Tuple>>
- Parameters:
flowProcess
- of type FlowProcessfunctionCall
- of type FunctionCall
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