Package org.apache.derby.impl.sql.compile

Class UnaryArithmeticOperatorNode

java.lang.Object

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

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

org.apache.derby.impl.sql.compile.OperatorNode

org.apache.derby.impl.sql.compile.UnaryOperatorNode

org.apache.derby.impl.sql.compile.UnaryArithmeticOperatorNode

All Implemented Interfaces:

Visitable

class UnaryArithmeticOperatorNode
extends UnaryOperatorNode

This node represents a unary arithmetic operator

Field Summary

Fields

Modifier and Type	Field	Description
(package private) static int	K_ABS
(package private) static int	K_MINUS
(package private) static int	K_PLUS
(package private) static int	K_SQRT
(package private) int	kind	This class is used to hold logically different objects for space efficiency.
private static java.lang.String[]	UNARY_METHODS
private static java.lang.String[]	UNARY_OPERATORS

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

K_BASE, K_XMLPARSE, K_XMLSERIALIZE, methodName, operand, operator, receiverInterfaceType, resultInterfaceType, UnaryArgTypes, UnaryMethodNames, UnaryOperators, UnaryResultTypes

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

transformed

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

Constructor Summary

Constructors

Constructor	Description
UnaryArithmeticOperatorNode(ValueNode operand, int kind, ContextManager cm)

Method Summary

Modifier and Type	Method	Description
(package private) ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)	Bind this operator
(package private) void	bindParameter()	For SQRT and ABS the parameter becomes a DOUBLE.
private void	bindSQRTABS()	Bind SQRT or ABS
private void	checkOperandIsNumeric(TypeId operandType)	Only called for Unary +/-.
(package private) void	generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)	Do code generation for this unary plus operator
boolean	isParameterNode()	A +?
(package private) boolean	isSameNodeKind(ValueNode o)	Some node classes represent several logical node types (to reduce footprint), which we call kinds.
boolean	requiresTypeFromContext()	Unary + and - require their type to be set if they wrap another node (e.g. a parameter) that requires type from its context.
(package private) void	setType(DataTypeDescriptor descriptor)	We are overwriting this method here because for -?

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

acceptChildren, addXmlOpMethodParams, bindOperand, categorize, constantExpression, getOperand, getOperatorString, getOrderableVariantType, getParameterOperand, getReceiverInterfaceName, isConstantExpression, isEquivalent, preprocess, printSubNodes, remapColumnReferencesToExpressions, setMethodName, setOperator, toString

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

pushSqlXmlUtil

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

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

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

accept, 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, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Field Detail

UNARY_OPERATORS

private static final java.lang.String[] UNARY_OPERATORS

UNARY_METHODS

private static final java.lang.String[] UNARY_METHODS

K_PLUS

static final int K_PLUS

See Also:

Constant Field Values

K_MINUS

static final int K_MINUS

See Also:

Constant Field Values

K_SQRT

static final int K_SQRT

See Also:

Constant Field Values

K_ABS

static final int K_ABS

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

Constructor Detail

UnaryArithmeticOperatorNode

UnaryArithmeticOperatorNode(ValueNode operand,
                            int kind,
                            ContextManager cm)
                     throws StandardException

Parameters:

operand - The operand of the node

kind - unary operator identity

cm - context manager

Throws:

StandardException

Method Detail

requiresTypeFromContext

public boolean requiresTypeFromContext()

Unary + and - require their type to be set if they wrap another node (e.g. a parameter) that requires type from its context.

Overrides:

requiresTypeFromContext in class ValueNode

Returns:

Whether this node's type will be determined from the context

See Also:

ValueNode.requiresTypeFromContext()

isParameterNode

public boolean isParameterNode()

A +? or a -? is considered a parameter.

Overrides:

isParameterNode in class ValueNode

bindParameter

void bindParameter()
            throws StandardException

For SQRT and ABS the parameter becomes a DOUBLE. For unary + and - no change is made to the underlying node. Once this node's type is set using setType, then the underlying node will have its type set.

Overrides:

bindParameter in class UnaryOperatorNode

Throws:

StandardException - Thrown if ? parameter doesn't have a type bound to it yet. ? parameter where it isn't allowed.

bindExpression

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

Bind this operator

Overrides:

bindExpression in class UnaryOperatorNode

Parameters:

fromList - The query's FROM list

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

checkOperandIsNumeric

private void checkOperandIsNumeric(TypeId operandType)
                            throws StandardException

Only called for Unary +/-.

Throws:

StandardException

generateExpression

void generateExpression(ExpressionClassBuilder acb,
                        MethodBuilder mb)
                 throws StandardException

Do code generation for this unary plus operator

Overrides:

generateExpression in class UnaryOperatorNode

Parameters:

acb - The ExpressionClassBuilder for the class we're generating

mb - The method the expression will go into

Throws:

StandardException - Thrown on error

bindSQRTABS

private void bindSQRTABS()
                  throws StandardException

Bind SQRT or ABS

Throws:

StandardException - Thrown on error

setType

void setType(DataTypeDescriptor descriptor)
      throws StandardException

We are overwriting this method here because for -?/+?, we now know the type of these dynamic parameters and hence we can do the parameter binding. The setType method will call the binding code after setting the type of the parameter

Overrides:

setType in class ValueNode

Parameters:

descriptor - The DataTypeServices to set in this ValueNode

Throws:

StandardException

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(org.apache.derby.impl.sql.compile.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 UnaryOperatorNode

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.