com.pervasive.datarush.matching.block

Class BlockCartesian

java.lang.Object

com.pervasive.datarush.operators.AbstractLogicalOperator

com.pervasive.datarush.operators.CompositeOperator

com.pervasive.datarush.matching.block.BlockCartesian

All Implemented Interfaces:

LogicalOperator

public class BlockCartesian
extends CompositeOperator

Block the input data by creating a cartesian product of the data.

Field Summary

Fields

Modifier and Type	Field and Description
static int	DEFAULT_BUFFER_ROWS The default buffer size, in records, for blocking.

Constructor Summary

Constructors

Constructor and Description
BlockCartesian() Generates the Cartesian product of the inputs.

Method Summary

Modifier and Type	Method and Description
protected void	compose(CompositionContext ctx) Compose the body of this operator.
int	getBufferRows() Gets the size (in rows) of the memory buffer used to generate output pairs.
String	getLeftFieldsPattern() Gets the output naming pattern for fields from the left hand input.
RecordPort	getLeftInput() Gets the record port providing the left hand input to the pair generation.
RecordPort	getOutput() Gets the record port providing the results of the pair generation.
String	getRightFieldsPattern() Gets the output naming pattern for fields from the right hand input.
RecordPort	getRightInput() Gets the record port providing the right hand input to the pair generation.
void	setBufferRows(int rows) Sets the size (in rows) of the memory buffer used to generate output pairs.
void	setLeftFieldsPattern(String pattern) Sets the output naming pattern for fields from the left hand input.
void	setRightFieldsPattern(String pattern) Sets the output naming pattern for fields from the right hand input.

Methods inherited from class com.pervasive.datarush.operators.AbstractLogicalOperator

disableParallelism, getInputPorts, getOutputPorts, newInput, newInput, newOutput, newRecordInput, newRecordInput, newRecordOutput, notifyError

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_BUFFER_ROWS

public static final int DEFAULT_BUFFER_ROWS

The default buffer size, in records, for blocking.

See Also:

setBufferRows(int), Constant Field Values

Constructor Detail

BlockCartesian

public BlockCartesian()

Generates the Cartesian product of the inputs.

Method Detail

getLeftFieldsPattern

public String getLeftFieldsPattern()

Gets the output naming pattern for fields from the left hand input.

Returns:

the pattern for the left hand side field names in output.

setLeftFieldsPattern

public void setLeftFieldsPattern(String pattern)

Sets the output naming pattern for fields from the left hand input. This is used to ensure distinct names in the output pairs.

Parameters:

pattern - name pattern for the left hand side field names

getRightFieldsPattern

public String getRightFieldsPattern()

Gets the output naming pattern for fields from the right hand input.

Returns:

the pattern for the right hand side field names in output.

setRightFieldsPattern

public void setRightFieldsPattern(String pattern)

Sets the output naming pattern for fields from the right hand input. This is used to ensure distinct names in the output pairs.

Parameters:

pattern - name pattern for the right hand side field names

getBufferRows

public int getBufferRows()

Gets the size (in rows) of the memory buffer used to generate output pairs.

Returns:

the number of rows allowed in the memory buffer

setBufferRows

public void setBufferRows(int rows)

Sets the size (in rows) of the memory buffer used to generate output pairs. Larger values can increase performance due to decreased intermediate file buffering.

Parameters:

rows - number of rows to store in memory buffer

getLeftInput

public RecordPort getLeftInput()

Gets the record port providing the left hand input to the pair generation.

Returns:

the left input port for the operation

getRightInput

public RecordPort getRightInput()

Gets the record port providing the right hand input to the pair generation.

Returns:

the right input port for the operation

getOutput

public RecordPort getOutput()

Gets the record port providing the results of the pair generation.

Returns:

the output port for the operation

compose

protected void compose(CompositionContext ctx)

Description copied from class: CompositeOperator

Compose the body of this operator. Implementations should do the following:

1. Perform any validation of configuration, input types, etc
2. Instantiate and configure sub-operators, adding them to the provided context via the method OperatorComposable.add(O)
3. Create necessary connections via the method OperatorComposable.connect(P, P). This includes connections from the composite's input ports to sub-operators, connections between sub-operators, and connections from sub-operators output ports to the composite's output ports

Specified by:

compose in class CompositeOperator

Parameters:

ctx - the context