org.cloudgraph.hbase.scan

Class ScanRecognizerContext

java.lang.Object

org.cloudgraph.hbase.scan.ScanRecognizerContext

All Implemented Interfaces:

EvaluationContext

public class ScanRecognizerContext
extends Object
implements EvaluationContext

Context which supports the "recognition" of one or more partial, fuzzy and other and other scan constructs within the context of a binary expression syntax tree.

Composite row key scans represent only logical binary 'AND' expressions across the key fields. So for relational binary expressions linked within a query syntax tree by one or more logical binary 'AND', expressions, a single partial or fuzzy row key scan may be used. But for relational binary expressions linked by logical binary 'OR' expressions multiple scans must be used. Clients of this context class may execute the resulting scans in series or in parallel depending on various performance and other considerations.

Since:

0.5.3

Author:

Scott Cinnamond

See Also:

org.cloudgraph.hbase.expr.Expr, org.cloudgraph.hbase.expr.BinaryExpr

Constructor Summary

Constructors

Constructor and Description
ScanRecognizerContext(DataGraphMapping graph) Constructs an empty context.

Method Summary

Modifier and Type	Method and Description
DataGraphMapping	getGraph()

Methods inherited from class java.lang.Object

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

Constructor Detail

ScanRecognizerContext

public ScanRecognizerContext(DataGraphMapping graph)

Constructs an empty context.

Method Detail

getGraph

public DataGraphMapping getGraph()