org.gvsig.expressionevaluator.impl.function.dataaccess

Class SelectFunction

java.lang.Object

org.gvsig.expressionevaluator.spi.AbstractFunction

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

org.gvsig.expressionevaluator.impl.function.dataaccess.SelectFunction

All Implemented Interfaces:

Function, Optimizer.FunctionOptimizer

public class SelectFunction
extends AbstractSelectFunction
implements Optimizer.FunctionOptimizer

Field Summary

Fields

Modifier and Type	Field and Description
static int	MODE_FROM_SELECTION
static int	MODE_FROM_SELECTION_IF_NOT_EMPTY
static int	MODE_FROM_STORE
static java.lang.String	PROP_FEATURETYPESUPPLIER

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
SelectFunction()

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)
protected Code.Callable	getColumnsCode(Codes args)
boolean	isHidden()
Code	optimize(Optimizer optimizer, Code.Callable caller)
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

Field Detail

MODE_FROM_STORE

public static final int MODE_FROM_STORE

See Also:

Constant Field Values

MODE_FROM_SELECTION

public static final int MODE_FROM_SELECTION

See Also:

Constant Field Values

MODE_FROM_SELECTION_IF_NOT_EMPTY

public static final int MODE_FROM_SELECTION_IF_NOT_EMPTY

See Also:

Constant Field Values

PROP_FEATURETYPESUPPLIER

public static final java.lang.String PROP_FEATURETYPESUPPLIER

See Also:

Constant Field Values

Constructor Detail

SelectFunction

public SelectFunction()

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

Specified by:

call in interface Function

Throws:

java.lang.Exception

getColumnsCode

protected Code.Callable getColumnsCode(Codes args)

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

optimize

public Code optimize(Optimizer optimizer,
                     Code.Callable caller)

Specified by:

optimize in interface Optimizer.FunctionOptimizer

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