cascading.nested.core

Class NestedBaseCopyFunction<Node,Result>

java.lang.Object

cascading.operation.BaseOperation<Context>

cascading.nested.core.NestedBaseOperation<Node,Result,Context>

cascading.nested.core.NestedSpecBaseOperation<Node,Result,NestedBaseCopyFunction.Context>

cascading.nested.core.NestedBaseCopyFunction<Node,Result>

All Implemented Interfaces:

cascading.flow.planner.DeclaresResults, cascading.operation.Function<NestedBaseCopyFunction.Context>, cascading.operation.Operation<NestedBaseCopyFunction.Context>, cascading.util.Traceable, java.io.Serializable

public abstract class NestedBaseCopyFunction<Node,Result>
extends NestedSpecBaseOperation<Node,Result,NestedBaseCopyFunction.Context>
implements cascading.operation.Function<NestedBaseCopyFunction.Context>

Class NestedBaseCopyFunction is the base class for Function implementations that rely on the CopySpec class when declaring transformations on nested object types.

Specifically, *CopyAsFunction and *CopyIntoFunction classes create or update (respectively) nested object types from a Function argument where the field value is a nest object type.

In the case of a *CopyIntoFunction the last argument in the arguments TupleEntry will be the object the CopySpec copies values into.

In the case of a *CopyAsFunction a new root object will be created for the CopySpec to copy values into.

Note the arguments TupleEntry will be passed to any Transform instances that are resettable Transform.isResettable() allowing for parameterized transformations on child values as they are copied to the new location.

In the case of JSON objects, a single JSON object is selected as an argument so that values contained in that object can be copied into the new object.

For selecting the values from multiple existing field values in order to create a new object or update an existing one see NestedBaseBuildFunction sub-classes.

See Also:

CopySpec, Serialized Form

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	NestedBaseCopyFunction.Context

Field Summary

Fields

Modifier and Type	Field and Description
protected heretical.pointer.operation.Copier<Node,Result>	copier

Fields inherited from class cascading.nested.core.NestedBaseOperation

nestedCoercibleType

Fields inherited from class cascading.operation.BaseOperation

fieldDeclaration, numArgs, trace

Fields inherited from interface cascading.operation.Operation

ANY

Constructor Summary

Constructors

Constructor and Description
NestedBaseCopyFunction(NestedCoercibleType<Node,Result> nestedCoercibleType, cascading.tuple.Fields fieldDeclaration, CopySpec... copySpecs)

Method Summary

Modifier and Type	Method and Description
void	operate(cascading.flow.FlowProcess flowProcess, cascading.operation.FunctionCall<NestedBaseCopyFunction.Context> functionCall)
void	prepare(cascading.flow.FlowProcess flowProcess, cascading.operation.OperationCall<NestedBaseCopyFunction.Context> operationCall)
protected void	resetTransforms(cascading.tuple.TupleEntry arguments, cascading.tuple.Fields fields)

Methods inherited from class cascading.nested.core.NestedSpecBaseOperation

getArgument, getResultNode, isInto

Methods inherited from class cascading.nested.core.NestedBaseOperation

deepCopy, getCoercibleType, getLiteralNode, getNestedPointerCompiler, getRootNode, iterable, size

Methods inherited from class cascading.operation.BaseOperation

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

Methods inherited from class java.lang.Object

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

Methods inherited from interface cascading.operation.Operation

cleanup, flush, getFieldDeclaration, getNumArgs, isSafe

Field Detail

copier

protected heretical.pointer.operation.Copier<Node,Result> copier

Constructor Detail

NestedBaseCopyFunction

public NestedBaseCopyFunction(NestedCoercibleType<Node,Result> nestedCoercibleType,
                              cascading.tuple.Fields fieldDeclaration,
                              CopySpec... copySpecs)

Method Detail

prepare

public void prepare(cascading.flow.FlowProcess flowProcess,
                    cascading.operation.OperationCall<NestedBaseCopyFunction.Context> operationCall)

Specified by:

prepare in interface cascading.operation.Operation<NestedBaseCopyFunction.Context>

Overrides:

prepare in class NestedSpecBaseOperation<Node,Result,NestedBaseCopyFunction.Context>

operate

public void operate(cascading.flow.FlowProcess flowProcess,
                    cascading.operation.FunctionCall<NestedBaseCopyFunction.Context> functionCall)

Specified by:

operate in interface cascading.operation.Function<NestedBaseCopyFunction.Context>

resetTransforms

protected void resetTransforms(cascading.tuple.TupleEntry arguments,
                               cascading.tuple.Fields fields)