org.modeshape.jcr.query.engine

Class ScanningQueryEngine.RowFilterSupplier

java.lang.Object

org.modeshape.jcr.query.engine.ScanningQueryEngine.RowFilterSupplier

All Implemented Interfaces:

NodeSequence.RowFilter

Enclosing class:

ScanningQueryEngine

protected abstract static class ScanningQueryEngine.RowFilterSupplier
extends Object
implements NodeSequence.RowFilter

A NodeSequence.RowFilter implementation that lazily initializes the real RowFilter implementation the first time it's needed and thereafter will simply delegate to the implementation.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	RowFilterSupplier()

Method Summary

Modifier and Type	Method and Description
protected abstract NodeSequence.RowFilter	createFilter() Instantiate the RowFilter that will be used.
protected NodeSequence.RowFilter	delegate()
boolean	isCurrentRowValid(NodeSequence.Batch batch) Determine if the current row in the given batch satisfies the filter and should be included in the results.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

RowFilterSupplier

protected RowFilterSupplier()

Method Detail

isCurrentRowValid

public final boolean isCurrentRowValid(NodeSequence.Batch batch)

Description copied from interface: NodeSequence.RowFilter

Determine if the current row in the given batch satisfies the filter and should be included in the results.

Implementations should never call NodeSequence.Batch.hasNext() or NodeSequence.Batch.nextRow().

Specified by:

isCurrentRowValid in interface NodeSequence.RowFilter

Parameters:

batch - the batch that is at a valid row

Returns:

true if the current row is acceptable, or false if it should be excluded

delegate

protected final NodeSequence.RowFilter delegate()

createFilter

protected abstract NodeSequence.RowFilter createFilter()

Instantiate the RowFilter that will be used. This method may be called more than once only if isCurrentRowValid(NodeSequence.Batch) is called from multiple threads.

Returns:

the row filter; may not be null

toString

public String toString()

Overrides:

toString in class Object