org.gvsig.expressionevaluator.impl.function.dataaccess

Class ExistsFunction

java.lang.Object

org.gvsig.expressionevaluator.spi.AbstractFunction

org.gvsig.expressionevaluator.impl.function.dataaccess.AbstractFeatureFunction

org.gvsig.expressionevaluator.impl.function.dataaccess.ExistsFunction

All Implemented Interfaces:

Function

public class ExistsFunction
extends AbstractFeatureFunction

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	NAME

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
ExistsFunction()

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	useArgumentsInsteadObjects()

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

current_row, current_store, getFeatureType, getNewFeatureStoreParameters

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, isHidden, isNull, isOperator, isSQLCompatible, name, returnType, template, toBoolean, toString, toString, toValue

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final java.lang.String NAME

See Also:

Constant Field Values

Constructor Detail

ExistsFunction

public ExistsFunction()

Method Detail

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