org.cloudgraph.hbase.filter

Class PredicateVisitor

java.lang.Object

org.plasma.query.visitor.DefaultQueryVisitor

org.cloudgraph.query.expr.ExpresionVisitorSupport

org.cloudgraph.hbase.filter.FilterHierarchyAssembler

org.cloudgraph.hbase.filter.PredicateVisitor

All Implemented Interfaces:

Assembler, HBaseFilterAssembler, org.plasma.query.visitor.QueryVisitor

Direct Known Subclasses:

ColumnPredicateVisitor, MultiColumnPredicateVisitor, RowPredicateVisitor

public abstract class PredicateVisitor
extends FilterHierarchyAssembler

Processes visitor events for query model elements common to both row and column filters, such as relational and group operators, within the context of HBase filter hierarchy assembly and maintains various context information useful to subclasses.

HBase filters may be collected into lists using FilterList each with a MUST_PASS_ALL or MUST_PASS_ONE (logical) operator. Lists may then be assembled into hierarchies used to represent complex expression trees filtering either rows or columns in HBase.

Since:

0.5

Author:

Scott Cinnamond

Field Summary

Fields

Modifier and Type	Field and Description
protected org.apache.hadoop.hbase.filter.CompareFilter.CompareOp	contextHBaseCompareOp
protected boolean	contextOpWildcard
protected org.plasma.sdo.PlasmaProperty	contextProperty
protected org.plasma.sdo.PlasmaType	contextType
protected org.plasma.query.model.PredicateOperator	contextWildcardOperator

Fields inherited from class org.cloudgraph.hbase.filter.FilterHierarchyAssembler

filterStack, params, rootFilter, rootType

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	PredicateVisitor(org.plasma.sdo.PlasmaType rootType)

Method Summary

Modifier and Type	Method and Description
void	clear()
void	start(org.plasma.query.model.GroupOperator operator)
void	start(org.plasma.query.model.RelationalOperator operator)

Methods inherited from class org.cloudgraph.hbase.filter.FilterHierarchyAssembler

filterTokens, getFilter, getParams, log, popFilter, pushFilter, pushFilter

Methods inherited from class org.cloudgraph.query.expr.ExpresionVisitorSupport

getChildExpressionCount, getChildExpressions, getLogicalOperatorCount, hasChildExpressions, hasWildcard

Methods inherited from class org.plasma.query.visitor.DefaultQueryVisitor

end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, end, getContext, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start, start

Methods inherited from class java.lang.Object

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

Field Detail

contextType

protected org.plasma.sdo.PlasmaType contextType

contextProperty

protected org.plasma.sdo.PlasmaProperty contextProperty

contextHBaseCompareOp

protected org.apache.hadoop.hbase.filter.CompareFilter.CompareOp contextHBaseCompareOp

contextOpWildcard

protected boolean contextOpWildcard

contextWildcardOperator

protected org.plasma.query.model.PredicateOperator contextWildcardOperator

Constructor Detail

PredicateVisitor

protected PredicateVisitor(org.plasma.sdo.PlasmaType rootType)

Method Detail

clear

public void clear()

Specified by:

clear in interface Assembler

Overrides:

clear in class FilterHierarchyAssembler

start

public void start(org.plasma.query.model.RelationalOperator operator)

Specified by:

start in interface org.plasma.query.visitor.QueryVisitor

Overrides:

start in class org.plasma.query.visitor.DefaultQueryVisitor

start

public void start(org.plasma.query.model.GroupOperator operator)

Specified by:

start in interface org.plasma.query.visitor.QueryVisitor

Overrides:

start in class org.plasma.query.visitor.DefaultQueryVisitor