BooleanConstantNode (Apache Derby V10.14 Internals)

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.BooleanConstantNode

All Implemented Interfaces:: Visitable

public final class BooleanConstantNode
extends ConstantNode

Field Summary

Fields
Modifier and Type Field Description

(package private) boolean booleanValue

(package private) boolean unknownValue
- Fields inherited from class org.apache.derby.impl.sql.compile.ConstantNode
  value
- Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
  AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
- Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode
  transformed

Fields
Modifier and Type	Field	Description
`(package private) boolean`	`booleanValue`
`(package private) boolean`	`unknownValue`

Constructor Summary

Constructors
Constructor	Description
`BooleanConstantNode(boolean value, ContextManager cm)`
`BooleanConstantNode(ContextManager cm)`
`BooleanConstantNode(TypeId t, ContextManager cm)`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`(package private) ValueNode`	`eliminateNots(boolean underNotNode)`	Eliminate NotNodes in the current query block.
`(package private) void`	`generateConstant(ExpressionClassBuilder acb, MethodBuilder mb)`	This generates the proper constant.
`(package private) java.lang.Object`	`getConstantValueAsObject()`	Return an Object representing the bind time value of this expression tree.
`(package private) java.lang.String`	`getValueAsString()`	Return the value as a string.
`(package private) boolean`	`isBooleanFalse()`	Does this represent a false constant.
`(package private) boolean`	`isBooleanTrue()`	Does this represent a true constant.
`double`	`selectivity(Optimizable optTable)`	The default selectivity for value nodes is 50%.
`(package private) void`	`setValue(DataValueDescriptor value)`	Set the value in this ConstantNode.

Methods inherited from class org.apache.derby.impl.sql.compile.ConstantNode
bindExpression, constantExpression, generateExpression, getClone, getOrderableVariantType, getValue, isCloneable, isConstantExpression, isEquivalent, isNull, toString

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from class org.apache.derby.impl.sql.compile.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 org.apache.derby.impl.sql.compile.ValueNode
bindExpression, categorize, changeToCNF, checkIsBoolean, checkTopPredicatesForEqualsConditions, copyFields, evaluateConstantExpressions, genEqualsFalseTree, generate, genIsNullTree, genSQLJavaSQLTree, getColumnName, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, isBinaryEqualsOperatorNode, isInListProbeNode, isParameterNode, isRelationalOperator, isSameNodeKind, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, requiresTypeFromContext, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

- Field Detail
  - booleanValue
```
boolean booleanValue
```
  - unknownValue
```
boolean unknownValue
```
- Constructor Detail
  - BooleanConstantNode
```
BooleanConstantNode(ContextManager cm)
             throws StandardException
```
    Parameters:
    
    cm - context manager
    
    Throws:
    
    StandardException
  - BooleanConstantNode
```
BooleanConstantNode(boolean value,
                    ContextManager cm)
             throws StandardException
```
    Throws:
    
    StandardException
  - BooleanConstantNode
```
BooleanConstantNode(TypeId t,
                    ContextManager cm)
             throws StandardException
```
    Throws:
    
    StandardException
- Method Detail
  - getConstantValueAsObject
```
java.lang.Object getConstantValueAsObject()
```
    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.)
  - getValueAsString
```
java.lang.String getValueAsString()
```
    Return the value as a string.
    
    Returns:
    
    The value as a string.
  - isBooleanTrue
```
boolean isBooleanTrue()
```
    Does this represent a true constant.
    
    Overrides:
    
    isBooleanTrue in class ValueNode
    
    Returns:
    
    Whether or not this node represents a true constant.
  - isBooleanFalse
```
boolean isBooleanFalse()
```
    Does this represent a false constant.
    
    Overrides:
    
    isBooleanFalse in class ValueNode
    
    Returns:
    
    Whether or not this node represents a false constant.
  - selectivity
```
public double selectivity(Optimizable optTable)
```
    The default selectivity for value nodes is 50%. This is overridden in specific cases, such as the RelationalOperators.
    
    Overrides:
    
    selectivity in class ValueNode
  - eliminateNots
```
ValueNode eliminateNots(boolean underNotNode)
```
    Eliminate NotNodes in the current query block. We traverse the tree, inverting ANDs and ORs and eliminating NOTs as we go. We stop at ComparisonOperators and boolean expressions. We invert ComparisonOperators and replace boolean expressions with boolean expression = false. NOTE: Since we do not recurse under ComparisonOperators, there still could be NotNodes left in the tree.
    
    Overrides:
    
    eliminateNots in class ValueNode
    
    Parameters:
    
    underNotNode - Whether or not we are under a NotNode.
    
    Returns:
    
    The modified expression
  - generateConstant
```
void generateConstant(ExpressionClassBuilder acb,
                      MethodBuilder mb)
```
    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
  - setValue
```
void setValue(DataValueDescriptor value)
```
    Set the value in this ConstantNode.
    
    Overrides:
    
    setValue in class ConstantNode

Class BooleanConstantNode

Field Summary

Fields inherited from class org.apache.derby.impl.sql.compile.ConstantNode

Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode

Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode

Constructor Summary

Method Summary

Methods inherited from class org.apache.derby.impl.sql.compile.ConstantNode

Methods inherited from class java.lang.Object

Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode

Methods inherited from class org.apache.derby.impl.sql.compile.ValueNode

Field Detail

booleanValue

unknownValue

Constructor Detail

BooleanConstantNode

BooleanConstantNode

BooleanConstantNode

Method Detail

getConstantValueAsObject

getValueAsString

isBooleanTrue

isBooleanFalse

selectivity

eliminateNots

generateConstant

setValue