com.tangosol.coherence.dslquery.statement

Class SelectStatementBuilder

java.lang.Object

com.tangosol.coherence.dslquery.statement.AbstractStatementBuilder<SelectStatementBuilder.SelectStatement>

com.tangosol.coherence.dslquery.statement.SelectStatementBuilder

All Implemented Interfaces:

StatementBuilder<SelectStatementBuilder.SelectStatement>

public class SelectStatementBuilder
extends AbstractStatementBuilder<SelectStatementBuilder.SelectStatement>

An implementation of a StatementBuilder that parses a CohQL term tree to produce an instance of a SelectStatementBuilder.SelectStatement.

Since:

Coherence 12.2.1

Author:

jk 2013.12.17

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SelectStatementBuilder.SelectStatement Implementation of the CohQL "SELECT" command.

Field Summary

Fields

Modifier and Type	Field and Description
static SelectStatementBuilder	INSTANCE An instance of a SelectStatementBuilder.

Constructor Summary

Constructors

Constructor and Description
SelectStatementBuilder()

Method Summary

Modifier and Type	Method and Description
protected InvocableMap.EntryAggregator	createAggregator(String cacheName, NodeTerm fields, String alias, boolean fDistinct, SelectListMaker transformer) Create the InvocableMap.EntryAggregator that will aggregate the results of this select query.
protected SelectListMaker	createSelectListMaker(List listBindVars, com.tangosol.config.expression.ParameterResolver namedBindVars, CoherenceQueryLanguage language) Create an instance of a SelectListMaker.
String	getDescription() Return a description of the CohQL command suitable for displaying as help text.
String	getSyntax() Return the syntax of the CohQL command.
protected boolean	isSelectStarQuery(String sAlias, NodeTerm termFields) Return true if this query is of the form "SELECT * FROM cache-name".
SelectStatementBuilder.SelectStatement	realize(ExecutionContext ctx, NodeTerm term, List listBindVars, com.tangosol.config.expression.ParameterResolver namedBindVars) Realizes an implementation of a Statement that can be executed to perform a specific CohQL command.

Methods inherited from class com.tangosol.coherence.dslquery.statement.AbstractStatementBuilder

atomicStringValueOf, ensureFilter, getAlias, getCacheName, getExtractor, getFields, getFile, getGroupBy, getInsertKey, getInsertValue, getIsDistinct, getSetList, getWhere, headsMatch

Methods inherited from class java.lang.Object

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

Field Detail

INSTANCE

public static final SelectStatementBuilder INSTANCE

An instance of a SelectStatementBuilder.

Constructor Detail

SelectStatementBuilder

public SelectStatementBuilder()

Method Detail

realize

public SelectStatementBuilder.SelectStatement realize(ExecutionContext ctx,
                                                      NodeTerm term,
                                                      List listBindVars,
                                                      com.tangosol.config.expression.ParameterResolver namedBindVars)

Description copied from interface: StatementBuilder

Realizes an implementation of a Statement that can be executed to perform a specific CohQL command.

Parameters:

ctx - the ExecutionContext to use to create commands

term - the parsed NodeTerm used to create the relevant Statement

listBindVars - the indexed bind variables

namedBindVars - the named bind variables

Returns:

an executable instance of a Statement

getSyntax

public String getSyntax()

Description copied from interface: StatementBuilder

Return the syntax of the CohQL command.

Returns:

the syntax of the CohQL command

getDescription

public String getDescription()

Description copied from interface: StatementBuilder

Return a description of the CohQL command suitable for displaying as help text.

Returns:

a description of the CohQL command suitable for displaying as help text

createAggregator

protected InvocableMap.EntryAggregator createAggregator(String cacheName,
                                                        NodeTerm fields,
                                                        String alias,
                                                        boolean fDistinct,
                                                        SelectListMaker transformer)

Create the InvocableMap.EntryAggregator that will aggregate the results of this select query.

Parameters:

cacheName - the cache being queried

fields - the fields being selected

alias - the alias of the cache name

fDistinct - a flag indicating whether this is a distinct query

transformer - the transformer to use to transform the field list to extractors

Returns:

an InvocableMap.EntryAggregator to use to aggregate the query results.

createSelectListMaker

protected SelectListMaker createSelectListMaker(List listBindVars,
                                                com.tangosol.config.expression.ParameterResolver namedBindVars,
                                                CoherenceQueryLanguage language)

Create an instance of a SelectListMaker.

Parameters:

listBindVars - the indexed bind variables that the SelectListMaker should use

namedBindVars - the named bind variables that the SelectListMaker should use

language - the CohQL language instance that the SelectListMaker should use

Returns:

a SelectListMaker

isSelectStarQuery

protected boolean isSelectStarQuery(String sAlias,
                                    NodeTerm termFields)

Return true if this query is of the form "SELECT * FROM cache-name".

Parameters:

sAlias - the alias for the cache name

termFields - the field list for the query

Returns:

true if this is a "SELECT * FROM cache-name" query