org.gvsig.expressionevaluator.impl.function.dataaccess

Class SelectCountFunction

java.lang.Object

org.gvsig.expressionevaluator.spi.AbstractFunction

org.gvsig.expressionevaluator.impl.function.dataaccess.AbstractSelectFunction

org.gvsig.expressionevaluator.impl.function.dataaccess.SelectCountFunction

All Implemented Interfaces:

Function

public class SelectCountFunction
extends AbstractSelectFunction

Field Summary

Fields inherited from class org.gvsig.expressionevaluator.spi.AbstractFunction

LOGGER, TYPE_BIGDECIMAL, TYPE_BOOLEAN, TYPE_DATE, TYPE_DOUBLE, TYPE_FLOAT, TYPE_INT, TYPE_LONG, TYPE_NULL, TYPE_STRING

Fields inherited from interface org.gvsig.expressionevaluator.Function

GROUP_AGGREGATE, GROUP_BOOLEAN, GROUP_CONVERSION, GROUP_DATETIME, GROUP_NUMERIC, GROUP_OGC, GROUP_OTHER, GROUP_PROGRAMMING, GROUP_STRING

Constructor Summary

Constructors

Constructor and Description
SelectCountFunction()

Method Summary

Modifier and Type	Method and Description
boolean	allowConstantFolding() Returns true if the function always returns the same value for the same parameters.
java.lang.Object	call(Interpreter interpreter, Codes args)
java.lang.Object	call(Interpreter interpreter, java.lang.Object[] args)
boolean	isHidden()
java.lang.String	toString(Codes args, Formatter<Code> formatter)
ExpressionBuilder.Value	toValue(ExpressionBuilder builder, Codes args)
boolean	useArgumentsInsteadObjects()

Methods inherited from class org.gvsig.expressionevaluator.impl.function.dataaccess.AbstractSelectFunction

getFeatureStore, getIdentifier, getStore, getTupleOrNull, getWhereCode, isHostExpression, removeOuterTablesReferences, replaceLocalVariables

Methods inherited from class org.gvsig.expressionevaluator.spi.AbstractFunction

addAlias, aliases, argc, checkDoubleValue, checkFloatValue, description, descriptionArgs, getBigDecimal, getBoolean, getBoolean, getBoolean, getBoolean, getBoolean, getComparable, getComparable, getDate, getDate, getDouble, getDouble, getFile, getFile, getFloat, getFloat, getFullDescription, getInt, getInt, getInt, getJsonArray, getJsonArray, getJsonObject, getJsonObject, getJsonStructure, getJsonStructure, getList, getLocalDateTime, getLocalDateTime, getLong, getLong, getObject, getObject, getStr, getStr, getType, getURL, group, isNull, isOperator, isSQLCompatible, name, returnType, template, toBoolean, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectCountFunction

public SelectCountFunction()

Method Detail

isHidden

public boolean isHidden()

Specified by:

isHidden in interface Function

Overrides:

isHidden in class AbstractFunction

allowConstantFolding

public boolean allowConstantFolding()

Description copied from interface: Function

Returns true if the function always returns the same value for the same parameters. If so, it is possible to optimize the generated code through the process of "constant folding". https://en.wikipedia.org/wiki/Constant_folding

Specified by:

allowConstantFolding in interface Function

Overrides:

allowConstantFolding in class AbstractFunction

Returns:

true if this function allow constant folding optimization.

useArgumentsInsteadObjects

public boolean useArgumentsInsteadObjects()

Specified by:

useArgumentsInsteadObjects in interface Function

Overrides:

useArgumentsInsteadObjects in class AbstractFunction

call

public java.lang.Object call(Interpreter interpreter,
                             java.lang.Object[] args)
                      throws java.lang.Exception

Throws:

java.lang.Exception

call

public java.lang.Object call(Interpreter interpreter,
                             Codes args)
                      throws java.lang.Exception

Specified by:

call in interface Function

Overrides:

call in class AbstractFunction

Throws:

java.lang.Exception

toValue

public ExpressionBuilder.Value toValue(ExpressionBuilder builder,
                                       Codes args)

Specified by:

toValue in interface Function

Overrides:

toValue in class AbstractFunction

toString

public java.lang.String toString(Codes args,
                                 Formatter<Code> formatter)

Specified by:

toString in interface Function

Overrides:

toString in class AbstractFunction