cascading.operation.assertion
Class AssertExpression
java.lang.Object
cascading.operation.BaseOperation<ScriptOperation.Context>
cascading.operation.expression.ScriptOperation
cascading.operation.expression.ExpressionOperation
cascading.operation.assertion.AssertExpression
- All Implemented Interfaces:
- DeclaresResults, Assertion<ScriptOperation.Context>, Operation<ScriptOperation.Context>, PlannedOperation<ScriptOperation.Context>, ValueAssertion<ScriptOperation.Context>, Traceable, Serializable
public class AssertExpression
- extends ExpressionOperation
- implements ValueAssertion<ScriptOperation.Context>
Class AssertExpression dynamically resolves a given expression using argument Tuple
values. Any Tuple that
returns true for the given expression pass the assertion. This Assertion
is based on the Janino compiler.
Specifically this filter uses the ExpressionEvaluator
, thus the syntax from that class is inherited here.
An expression may use field names directly as parameters in the expression, or field positions with the syntax
"$n", where n is an integer.
Given an argument tuple with the fields "a" and "b", the following expression returns true:
a + b == $0 + $1
Further, the types of the tuple elements will be coerced into the given parameterTypes. Regardless of the actual
tuple element values, they will be converted to the types expected by the expression.
- See Also:
- Serialized Form
Fields inherited from interface cascading.operation.Operation |
ANY |
AssertExpression
@ConstructorProperties(value={"expression","parameterType"})
public AssertExpression(String expression,
Class parameterType)
- Constructor ExpressionFilter creates a new ExpressionFilter instance.
- Parameters:
expression
- of type StringparameterType
- of type Class
AssertExpression
@ConstructorProperties(value={"fieldDeclaration","expression","parameterNames","parameterTypes"})
public AssertExpression(Fields fieldDeclaration,
String expression,
String[] parameterNames,
Class[] parameterTypes)
- Constructor AssertExpression creates a new AssertExpression instance.
- Parameters:
fieldDeclaration
- of type Fieldsexpression
- of type StringparameterNames
- of type String[]parameterTypes
- of type Class[]
supportsPlannerLevel
public boolean supportsPlannerLevel(PlannerLevel plannerLevel)
- Specified by:
supportsPlannerLevel
in interface PlannedOperation<ScriptOperation.Context>
doAssert
public void doAssert(FlowProcess flowProcess,
ValueAssertionCall<ScriptOperation.Context> assertionCall)
- Description copied from interface:
ValueAssertion
- Method doAssert performs the assertion.
- Specified by:
doAssert
in interface ValueAssertion<ScriptOperation.Context>
- Parameters:
flowProcess
- of type FlowProcessassertionCall
- of type ValueAssertionCall
Copyright © 2007-2014 Concurrent, Inc. All Rights Reserved.