Class NumericConstantNode

java.lang.Object

org.apache.derby.impl.sql.compile.QueryTreeNode

org.apache.derby.impl.sql.compile.ValueNode

org.apache.derby.impl.sql.compile.ConstantNode

org.apache.derby.impl.sql.compile.NumericConstantNode

All Implemented Interfaces:

Visitable

public final class NumericConstantNode
extends ConstantNode

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final int	K_BIGINT
(package private) static final int	K_DECIMAL
(package private) static final int	K_DOUBLE
(package private) static final int	K_INT
(package private) static final int	K_REAL
(package private) static final int	K_SMALLINT
(package private) static final int	K_TINYINT
(package private) final int	kind	This class is used to hold logically different objects for space efficiency.

Fields inherited from class ConstantNode

value

Fields inherited from class ValueNode

transformed

Fields inherited from class QueryTreeNode

AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX

Constructor Summary

Constructors

Constructor	Description
NumericConstantNode(TypeId t, Number value, ContextManager cm)
NumericConstantNode(TypeId t, ContextManager cm)	Constructor for a typed null node

Method Summary

Modifier and Type	Method	Description
(package private) void	generateConstant(ExpressionClassBuilder acb, MethodBuilder mb)	This generates the proper constant.
(package private) Object	getConstantValueAsObject()	Return an Object representing the bind time value of this expression tree.
private int	getKind(TypeId t)
private int	getMaxWidth(TypeId t, Object val)
private int	getPrecision(TypeId t, Number val)
private int	getScale(TypeId t, Object val)
(package private) boolean	isSameNodeKind(ValueNode o)	Some node classes represent several logical node types (to reduce footprint), which we call kinds.
private void	setValue(TypeId t, Number value)

Methods inherited from class ConstantNode

bindExpression, constantExpression, generateExpression, getClone, getOrderableVariantType, getValue, isCloneable, isConstantExpression, isEquivalent, isNull, setValue, toString

Methods inherited from class ValueNode

bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, eliminateNots, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getColumnName, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isInListProbeNode, isParameterNode, isRelationalOperator, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

Methods inherited from class QueryTreeNode

accept, acceptChildren, addTag, addUDTUsagePriv, addUDTUsagePriv, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, copyTagsFrom, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContext, getContextManager, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getLongProperty, getNullNode, getOffsetOrderedNodes, getOptimizerFactory, getOptimizerTracer, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, getUDTDesc, isAtomic, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, optimizerTracingIsOn, orReliability, parseSearchCondition, parseStatement, printLabel, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist

Methods inherited from class Object

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

Field Details

K_TINYINT

static final int K_TINYINT

See Also:

• Constant Field Values

K_SMALLINT

static final int K_SMALLINT

See Also:

• Constant Field Values

K_INT

static final int K_INT

See Also:

• Constant Field Values

K_BIGINT

static final int K_BIGINT

See Also:

• Constant Field Values

K_DECIMAL

static final int K_DECIMAL

See Also:

• Constant Field Values

K_DOUBLE

static final int K_DOUBLE

See Also:

• Constant Field Values

K_REAL

static final int K_REAL

See Also:

• Constant Field Values

kind

final int kind

This class is used to hold logically different objects for space efficiency. kind represents the logical object type. See also ValueNode.isSameNodeKind(ValueNode).

Constructor Details

NumericConstantNode

NumericConstantNode(TypeId t,
 ContextManager cm)
             throws StandardException

Constructor for a typed null node

Parameters:

t - type

cm - context manager

Throws:

StandardException

NumericConstantNode

NumericConstantNode(TypeId t,
 Number value,
 ContextManager cm)
             throws StandardException

Parameters:

value - An object containing the value of the constant.

cm - context manager

Throws:

StandardException

Method Details

getPrecision

private int getPrecision(TypeId t,
 Number val)
                  throws StandardException

Throws:

StandardException

getScale

private int getScale(TypeId t,
 Object val)
              throws StandardException

Throws:

StandardException

getMaxWidth

private int getMaxWidth(TypeId t,
 Object val)
                 throws StandardException

Throws:

StandardException

getKind

private int getKind(TypeId t)

setValue

private void setValue(TypeId t,
 Number value)
               throws StandardException

Throws:

StandardException

getConstantValueAsObject

Object getConstantValueAsObject()
                         throws StandardException

Return an Object representing the bind time value of this expression tree. If the expression tree does not evaluate to a constant at bind time then we return null. This is useful for bind time resolution of VTIs. RESOLVE: What do we do for primitives?

Overrides:

getConstantValueAsObject in class ValueNode

Returns:

An Object representing the bind time value of this expression tree. (null if not a bind time constant.)

Throws:

StandardException - Thrown on error

generateConstant

void generateConstant(ExpressionClassBuilder acb,
 MethodBuilder mb)
               throws StandardException

This generates the proper constant. It is implemented by every specific constant node (e.g. IntConstantNode).

Specified by:

generateConstant in class ConstantNode

Parameters:

acb - The ExpressionClassBuilder for the class being built

mb - The method the expression will go into

Throws:

StandardException - Thrown on error

isSameNodeKind

boolean isSameNodeKind(ValueNode o)

Description copied from class: ValueNode

Some node classes represent several logical node types (to reduce footprint), which we call kinds. This means that implementations of ValueNode.isEquivalent(ValueNode) cannot always just use instanceof to check if the other node represents the same kind. Hence this method needs to be overridden by all node classes that represent several kinds. This default implementation does not look at kinds. It is only called from implementations of isEquivalent.

Overrides:

isSameNodeKind in class ValueNode

Parameters:

o - The other value node whose kind we want to compare with.

Returns:

true if this and o represent the same logical node type, i.e. kind.