org.modeshape.jcr.query

Interface RowExtractors.ExtractFromRow

All Known Implementing Classes:

ScanningQueryEngine.PropertyValueExtractor

Enclosing class:

RowExtractors

public static interface RowExtractors.ExtractFromRow

An operation that extracts a single value from the current row in a given NodeSequence.Batch. Note that a single instance will be called many times (once for each row in the batches of a NodeSequence).

Method Summary

Modifier and Type	Method and Description
TypeSystem.TypeFactory<?>	getType() Get the type of value that this extractor will return from getValueInRow(org.modeshape.jcr.query.NodeSequence.RowAccessor).
Object	getValueInRow(NodeSequence.RowAccessor row) Evaluate the DynamicOperand against the current row in the supplied batch.

Method Detail

getType

TypeSystem.TypeFactory<?> getType()

Get the type of value that this extractor will return from getValueInRow(org.modeshape.jcr.query.NodeSequence.RowAccessor).

Returns:

the type; never null

getValueInRow

Object getValueInRow(NodeSequence.RowAccessor row)

Evaluate the DynamicOperand against the current row in the supplied batch. Note that implementations will need to know whether to get the only node in the row or how to get a NodeSequence.RowAccessor.getNode(int) for a specific selector.

Parameters:

row - the row accessor through which the current row values can be obtained; never null

Returns:

the dynamic operands value for the current row; may be null