com.tangosol.coherence.dslquery.internal

Class SelectListMaker

java.lang.Object

com.tangosol.coherence.dslquery.internal.AbstractCoherenceQueryWalker

com.tangosol.coherence.dslquery.internal.SelectListMaker

All Implemented Interfaces:

TermWalker

public class SelectListMaker
extends AbstractCoherenceQueryWalker

SelectListMaker is a visitor class that converts a given Abstract Syntax Tree into implementation Objects for a select query. The implementation Objects are typically subclasses of InvocableMap.EntryAggregator. The SelectListMaker can also be used to make ValueExtractors.

Author:

djl 2009.08.31

Field Summary

Fields

Modifier and Type	Field and Description
protected Object[]	m_aResults The results of the classification
protected int	m_nCallCount The count of classifications that are calls tree of Objects is built
protected String	m_sCacheName The name of the cache that the select list is being built for
protected NodeTerm	m_term The Term that is the AST that encodes select list

Fields inherited from class com.tangosol.coherence.dslquery.internal.AbstractCoherenceQueryWalker

f_language, f_propertyBuilder, f_termKeyFunction, m_atomicTerm, m_fExtendedLanguage, m_listBindVars, m_namedBindVars, m_oResult, m_sAlias

Constructor Summary

Constructors

Constructor and Description
SelectListMaker(List indexedBindVars, com.tangosol.config.expression.ParameterResolver namedBindVars, CoherenceQueryLanguage language) Construct a new SelectListMaker using given array for indexed Bind vars and the given Map for named bind variables.

Method Summary

Modifier and Type	Method and Description
protected void	acceptBinaryOperator(String sOperator, Term termLeft, Term termRight) The receiver has classified a binary operation node
protected void	acceptCall(String sFunctionName, NodeTerm term) The receiver has classified a call node
protected void	acceptIdentifier(String sIdentifier) The receiver has classified an identifier node.
protected void	acceptPath(NodeTerm term) The receiver has classified a path node.
DistinctValues	getDistinctValues() Turn the results of tree processing into a DistinctValues aggregator
Object[]	getResults() Get the resultant Object[] from the tree processing
InvocableMap.EntryAggregator	getResultsAsEntryAggregator() Turn the results of tree processing into an InvocableMap.EntryAggregator that will perform the aggregation.
InvocableMap.EntryProcessor	getResultsAsEntryProcessor() Turn the results of tree processing into an InvocableMap.EntryProcessor that will return the results of a query
InvocableMap.EntryAggregator	getResultsAsReduction() Turn the results of tree processing into an InvocableMap.EntryAggregator that will return the results of a query.
ValueExtractor	getResultsAsValueExtractor() Turn the results of tree processing into a ValueExtractor
boolean	hasCalls() Test to see if the receiver had nodes that are call which would mean the result is an aggregation
boolean	isAggregation() Test to see if the results of processing resulted in an aggregation.
Object[]	makeSelectsForCache(String sCacheName, NodeTerm term) Process the AST Tree using the given Term

Methods inherited from class com.tangosol.coherence.dslquery.internal.AbstractCoherenceQueryWalker

acceptAtom, acceptIdentifierInternal, acceptKeyedBinding, acceptList, acceptLiteral, acceptNode, acceptNumericBinding, acceptPathAsChainedExtractor, acceptTerm, acceptUnaryOperator, append, buildExtractor, getResult, reflectiveMakeObject, setAlias, setExtendedLanguage, setResult, walk

Methods inherited from class java.lang.Object

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

Field Detail

m_sCacheName

protected String m_sCacheName

The name of the cache that the select list is being built for

m_term

protected NodeTerm m_term

The Term that is the AST that encodes select list

m_nCallCount

protected int m_nCallCount

The count of classifications that are calls tree of Objects is built

m_aResults

protected Object[] m_aResults

The results of the classification

Constructor Detail

SelectListMaker

public SelectListMaker(List indexedBindVars,
                       com.tangosol.config.expression.ParameterResolver namedBindVars,
                       CoherenceQueryLanguage language)

Construct a new SelectListMaker using given array for indexed Bind vars and the given Map for named bind variables.

Parameters:

indexedBindVars - the indexed bind variables

namedBindVars - the named bind variables

language - the CoherenceQueryLanguage instance to use

Method Detail

hasCalls

public boolean hasCalls()

Test to see if the receiver had nodes that are call which would mean the result is an aggregation

Returns:

the results of the test

isAggregation

public boolean isAggregation()

Test to see if the results of processing resulted in an aggregation.

Returns:

the results of the test

getResults

public Object[] getResults()

Get the resultant Object[] from the tree processing

Returns:

the results of processing

getResultsAsValueExtractor

public ValueExtractor getResultsAsValueExtractor()

Turn the results of tree processing into a ValueExtractor

Returns:

the resulting ValueExtractor

getDistinctValues

public DistinctValues getDistinctValues()

Turn the results of tree processing into a DistinctValues aggregator

Returns:

the resulting DistinctValues

getResultsAsEntryProcessor

public InvocableMap.EntryProcessor getResultsAsEntryProcessor()

Turn the results of tree processing into an InvocableMap.EntryProcessor that will return the results of a query

Returns:

the resulting EntryProcessor

getResultsAsReduction

public InvocableMap.EntryAggregator getResultsAsReduction()

Turn the results of tree processing into an InvocableMap.EntryAggregator that will return the results of a query.

Returns:

the resulting EntryAggregator

getResultsAsEntryAggregator

public InvocableMap.EntryAggregator getResultsAsEntryAggregator()

Turn the results of tree processing into an InvocableMap.EntryAggregator that will perform the aggregation.

Returns:

the resulting EntryAggregator

makeSelectsForCache

public Object[] makeSelectsForCache(String sCacheName,
                                    NodeTerm term)

Process the AST Tree using the given Term

Parameters:

sCacheName - the name of the cache to make select list for

term - the AST to walk to make the select list

Returns:

the resulting Object[] of results

acceptBinaryOperator

protected void acceptBinaryOperator(String sOperator,
                                    Term termLeft,
                                    Term termRight)

The receiver has classified a binary operation node

Overrides:

acceptBinaryOperator in class AbstractCoherenceQueryWalker

Parameters:

sOperator - the String representing the operator

termLeft - the left Term of the operation

termRight - the left Term of the operation

acceptCall

protected void acceptCall(String sFunctionName,
                          NodeTerm term)

The receiver has classified a call node

Overrides:

acceptCall in class AbstractCoherenceQueryWalker

Parameters:

sFunctionName - the function name

term - a Term whose children are the parameters to the call

acceptIdentifier

protected void acceptIdentifier(String sIdentifier)

Description copied from class: AbstractCoherenceQueryWalker

The receiver has classified an identifier node.

Overrides:

acceptIdentifier in class AbstractCoherenceQueryWalker

Parameters:

sIdentifier - the String representing the identifier

acceptPath

protected void acceptPath(NodeTerm term)

Description copied from class: AbstractCoherenceQueryWalker

The receiver has classified a path node.

Overrides:

acceptPath in class AbstractCoherenceQueryWalker

Parameters:

term - a Term whose children are the elements of the path