Package org.cloudgraph.hbase.scan

Analyzes the characteristics of a query and assembles composite start and stop row keys, in order to leverage the important HBase partial row-key scan capability for every possible query predicate expression.

See: Description

Interface Summary

Interface	Description
CompleteRowKey	Represents an entire row key such that every field element in the key is present.
CompleteRowKeyLiteral	Represents the literal for an individual field within a composite row key and provides access to the key byte sequence for various supported relational operators under a row-key 'Get' operation for various optionally configurable hashing, formatting, padding and other features.
FuzzyRowKey	Provides access to the key byte and fuzzy info byte sequences applicable for HBase FuzzyRowFilter.
FuzzyRowKeyLiteral	Represents the literal for an individual field within a composite fuzzy row key scan using HBase FuzzyRowFilter, and provides access to the key byte and fuzzy info byte sequences under various optionally configurable hashing, formatting, padding and other features.
PartialRowKey	Represents a composite partial row key scan providing access to the composite start and stop key bytes.
PartialRowKeyLiteral	Represents the literal for an individual field within a composite partial row key scan and provides access to start and stop byte sequences for various relational operators under the HBase partial row-key scan for various optionally configurable hashing, formatting, padding and other features.
RowKeyScanAssembler	Assembles a complete composite or partial composite partial row (start/stop) key pair where each field within the composite start and stop row keys are constructed based a set of query predicates.
WildcardPartialRowKeyLiteral	Represents the literal for an individual field within a composite partial row key scan and provides access to start and stop byte sequences for various wildcard operators under the HBase partial row-key scan for various optionally configurable hashing, formatting, padding and other features.

Class Summary

Class	Description
CompleteRowKeyAssembler	Assembles a row key where each field within the composite row key is constructed based a set of given query predicates.
FuzzyRowKeyScanAssembler	Assembles a composite fuzzy row key bytes / fuzzy info bytes pair where each field within the composite row keys are constructed based a set of query predicates.
IntegralLiteral	An integral data "flavor" specific literal class used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.
PartialRowKeyScanAssembler	Assembles a composite partial row (start/stop) key pair where each field within the composite start and stop row keys are constructed based a set of query predicates.
RealLiteral	A real data "flavor" specific literal class used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.
ScanCollector	Collector visitor which supports the "recognition" of one or more partial, fuzzy and other scan constructs within the context of a binary (query) expression syntax tree, encapsulating operator precedence and other factors.
ScanContext	Deprecated
ScanLiteral	A configuration driven, context rich abstract class where subclasses are data "flavor" and data type specific and used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.
ScanLiteralAssembler	Assembles the set of data "flavor" and data type specific scan literals used to construct composite partial row (start/stop) key pair.
ScanLiteralFactory	Simple factory constructing data "flavor" and data type specific scan literals given various configuration specific as well as predicate context specific relational operators.
ScanLiterals	A collection of scan literals which provides various accessor methods which indicate the applicability of the scan literal collection under various scan operations.
ScanRecognizerContext	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.
ScanRecognizerLogicalBinaryExpr
ScanRecognizerRelationalBinaryExpr	An RelationalBinaryExpr implementation which uses a specific evaluation context to evaluate the value(s) of a data graph property along the query property traversal path within the context of a binary expression (syntax) tree.
ScanRecognizerSyntaxTreeAssembler	A binary expression tree assembler which constructs an operator precedence map, then visits (traverses) the given predicate expression syntax tree depth-first using an adapted shunting-yard algorithm and assembles a resulting binary tree structure with expression nodes specific for detecting i.e.
StringLiteral	A string data "flavor" specific literal class used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.
TemporalLiteral	A temporal data "flavor" specific literal class used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.
WildcardStringLiteral	A wildcard string data "flavor" specific literal class used to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features.

Exception Summary

Exception	Description
IllegalOperatorMappingException
ImbalancedOperatorMappingException
InvalidFuzzyRowKeyWildcardException
ScanException

Package org.cloudgraph.hbase.scan Description

Analyzes the characteristics of a query and assembles composite start and stop row keys, in order to leverage the important HBase partial row-key scan capability for every possible query predicate expression.

For each set of query predicates forming the basis for an HBase scan, a set of context rich, data "flavor" specific structures are constructed to abstract the complexities involved in assembling the various segments and fields of composite (scan start/stop) row keys under various relational and logical operator and various configurable composite key-field hashing, formatting, padding and other features. If an HBase partial row-key scan is possible based on the literal set, a PartialRowKeyScanAssembler is invoked using the current scan context resulting in a pair of composite start/stop row keys. These are then used in the HBase client scan API start and stop row.