org.cloudgraph.hbase.filter

Class FilterHierarchyAssembler

java.lang.Object

org.plasma.query.visitor.DefaultQueryVisitor

org.cloudgraph.query.expr.ExpresionVisitorSupport

org.cloudgraph.hbase.filter.FilterHierarchyAssembler

All Implemented Interfaces:

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

Direct Known Subclasses:

PredicateVisitor

public abstract class FilterHierarchyAssembler
extends ExpresionVisitorSupport
implements HBaseFilterAssembler

Supports assembly of complex HBase filter hierarchies representing query predicate expression trees using a filter stack.

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 Stack<org.apache.hadoop.hbase.filter.FilterList>	filterStack
protected List<Object>	params
protected org.apache.hadoop.hbase.filter.FilterList	rootFilter
protected org.plasma.sdo.PlasmaType	rootType

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
void	clear()
protected String[]	filterTokens(String[] tokens)
org.apache.hadoop.hbase.filter.Filter	getFilter() Returns the assembled filter, filter list or filter hierarchy root.
Object[]	getParams()
protected void	log(org.plasma.query.model.Where root)
protected void	popFilter()
protected void	pushFilter()
protected void	pushFilter(org.apache.hadoop.hbase.filter.FilterList.Operator oper)

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, start, start

Methods inherited from class java.lang.Object

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

Field Detail

params

protected List<Object> params

rootFilter

protected org.apache.hadoop.hbase.filter.FilterList rootFilter

filterStack

protected Stack<org.apache.hadoop.hbase.filter.FilterList> filterStack

rootType

protected org.plasma.sdo.PlasmaType rootType

Constructor Detail

FilterHierarchyAssembler

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

Method Detail

clear

public void clear()

Specified by:

clear in interface Assembler

getFilter

public org.apache.hadoop.hbase.filter.Filter getFilter()

Returns the assembled filter, filter list or filter hierarchy root.

Specified by:

getFilter in interface HBaseFilterAssembler

Returns:

the assembled filter, filter list or or filter hierarchy root.

getParams

public Object[] getParams()

pushFilter

protected void pushFilter()

pushFilter

protected void pushFilter(org.apache.hadoop.hbase.filter.FilterList.Operator oper)

popFilter

protected void popFilter()

filterTokens

protected String[] filterTokens(String[] tokens)

log

protected void log(org.plasma.query.model.Where root)