cascading.operation.expression
Class ExpressionOperation

java.lang.Object
  cascading.operation.BaseOperation<ScriptOperation.Context>
      cascading.operation.expression.ScriptOperation
          cascading.operation.expression.ExpressionOperation

All Implemented Interfaces:

Operation<ScriptOperation.Context>, Serializable

Direct Known Subclasses:

AssertExpression, ExpressionFilter, ExpressionFunction

public class ExpressionOperation
extends ScriptOperation

Class ExpressionOperation is the base class for ExpressionFunction, ExpressionFilter, AssertExpression.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class cascading.operation.expression.ScriptOperation

ScriptOperation.Context

Field Summary

Fields inherited from class cascading.operation.expression.ScriptOperation

block, parameterNames, parameterTypes, returnType

Fields inherited from class cascading.operation.BaseOperation

fieldDeclaration, numArgs, trace

Fields inherited from interface cascading.operation.Operation

ANY

Constructor Summary

protected	ExpressionOperation(Fields fieldDeclaration, String expression)
protected	ExpressionOperation(Fields fieldDeclaration, String expression, Class parameterType)
protected	ExpressionOperation(Fields fieldDeclaration, String expression, String[] parameterNames, Class[] parameterTypes)
protected	ExpressionOperation(String expression, Class parameterType)
protected	ExpressionOperation(String expression, String[] parameterNames, Class[] parameterTypes)

Method Summary

protected ScriptEvaluator	getEvaluator(Class returnType, String[] parameterNames, Class[] parameterTypes)
String	getExpression()
protected String[]	guessParameterNames()

Methods inherited from class cascading.operation.expression.ScriptOperation

equals, evaluate, getBlock, getParameterNames, getParameterTypes, getReturnType, hashCode, prepare

Methods inherited from class cascading.operation.BaseOperation

cleanup, flush, getFieldDeclaration, getNumArgs, getTrace, isSafe, printOperationInternal, toString, toStringInternal

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

ExpressionOperation

@ConstructorProperties(value={"fieldDeclaration","expression"})
protected ExpressionOperation(Fields fieldDeclaration,
                                                         String expression)

ExpressionOperation

@ConstructorProperties(value={"fieldDeclaration","expression","parameterType"})
protected ExpressionOperation(Fields fieldDeclaration,
                                                         String expression,
                                                         Class parameterType)

ExpressionOperation

@ConstructorProperties(value={"fieldDeclaration","expression","parameterNames","parameterTypes"})
protected ExpressionOperation(Fields fieldDeclaration,
                                                         String expression,
                                                         String[] parameterNames,
                                                         Class[] parameterTypes)

ExpressionOperation

@ConstructorProperties(value={"expression","parameterType"})
protected ExpressionOperation(String expression,
                                                         Class parameterType)

ExpressionOperation

@ConstructorProperties(value={"expression","parameterNames","parameterTypes"})
protected ExpressionOperation(String expression,
                                                         String[] parameterNames,
                                                         Class[] parameterTypes)

Method Detail

getExpression

public String getExpression()

guessParameterNames

protected String[] guessParameterNames()
                                throws CompileException,
                                       IOException

Overrides:

guessParameterNames in class ScriptOperation

Throws:

CompileException

IOException

getEvaluator

protected ScriptEvaluator getEvaluator(Class returnType,
                                       String[] parameterNames,
                                       Class[] parameterTypes)

Overrides:

getEvaluator in class ScriptOperation