Class CharConstantNode

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.CharConstantNode

All Implemented Interfaces:

Visitable

public final class CharConstantNode
extends ConstantNode

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static final int	K_CHAR
(package private) static final int	K_CLOB
(package private) static final int	K_LONGVARCHAR
(package private) static final int	K_VARCHAR
(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
CharConstantNode(int kind, TypeId t, ContextManager cm)
CharConstantNode(String newValue, int newLength, ContextManager cm)	Constructor for a CharConstantNode of a specific length.
CharConstantNode(String value, ContextManager cm)
CharConstantNode(TypeId t, ContextManager cm)

Method Summary

Modifier and Type	Method	Description
(package private) ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates)	Bind this expression.
(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.
(package private) String	getString()	Return the value from this CharConstantNode
(package private) boolean	isSameNodeKind(ValueNode o)	Some node classes represent several logical node types (to reduce footprint), which we call kinds.

Methods inherited from class ConstantNode

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_CHAR

static final int K_CHAR

See Also:

• Constant Field Values

K_VARCHAR

static final int K_VARCHAR

See Also:

• Constant Field Values

K_LONGVARCHAR

static final int K_LONGVARCHAR

See Also:

• Constant Field Values

K_CLOB

static final int K_CLOB

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

CharConstantNode

CharConstantNode(String value,
 ContextManager cm)
          throws StandardException

Throws:

StandardException

CharConstantNode

CharConstantNode(TypeId t,
 ContextManager cm)
          throws StandardException

Throws:

StandardException

CharConstantNode

CharConstantNode(int kind,
 TypeId t,
 ContextManager cm)
          throws StandardException

Parameters:

kind - The node kind

t - The type id

cm - The context manager

Throws:

StandardException

CharConstantNode

CharConstantNode(String newValue,
 int newLength,
 ContextManager cm)
          throws StandardException

Constructor for a CharConstantNode of a specific length.

Parameters:

newValue - A String containing the value of the constant

newLength - The length of the new value of the constant

cm -

Throws:

StandardException

Method Details

getString

String getString()
          throws StandardException

Return the value from this CharConstantNode

Returns:

The value of this CharConstantNode.

Throws:

StandardException - Thrown on error

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

bindExpression

ValueNode bindExpression(FromList fromList,
 SubqueryList subqueryList,
 List<AggregateNode> aggregates)
                  throws StandardException

Description copied from class: ConstantNode

Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression. In this case, there are no sub-expressions, and the return type is already known, so this is just a stub.

Overrides:

bindExpression in class ConstantNode

Parameters:

fromList - The FROM list for the query this expression is in, for binding columns.

subqueryList - The subquery list being built as we find SubqueryNodes

aggregates - The aggregate list being built as we find AggregateNodes

Returns:

The new top of the expression tree.

Throws:

StandardException - Thrown on error. Although this class doesn't throw this exception, it's subclasses do and hence this method signature here needs to have throws StandardException

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 code to place the code

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.