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:

Node, Visitable

public class UnaryArithmeticOperatorNode
extends UnaryOperatorNode

This node represents a unary arithmetic operator

Field Summary

private static int	ABSOLUTE
private int	operatorType
private static int	SQRT
private static java.lang.String[]	UNARY_METHODS
private static int	UNARY_MINUS
private static java.lang.String[]	UNARY_OPERATORS
private static int	UNARY_PLUS

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

methodName, operand, operator, receiverInterfaceType, resultInterfaceType, UnaryArgTypes, UnaryMethodNames, UnaryOperators, UnaryResultTypes, XMLPARSE_OP, XMLSERIALIZE_OP

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_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, isPrivilegeCollectionRequired

Constructor Summary

UnaryArithmeticOperatorNode()

Method Summary

ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) 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 +/-.
void	generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) Do code generation for this unary plus operator
void	init(java.lang.Object operand) Initializer for a UnaryArithmeticOperatorNode
boolean	isParameterNode() A +?
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.
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, init, 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, generateFilter, genIsNullTree, genSQLJavaSQLTree, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isInListProbeNode, isRelationalOperator, isSameNodeType, 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, bindOffsetFetch, bindRowMultiSet, bindUserCatalogType, bindUserType, checkReliability, checkReliability, convertDefaultNode, createTypeDependency, debugFlush, debugPrint, disablePrivilegeCollection, formatNodeString, foundString, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContextManager, getCursorInfo, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getNodeFactory, getNodeType, getNullNode, getParameterTypes, getSchemaDescriptor, getSchemaDescriptor, getStatementType, getTableDescriptor, getTypeCompiler, init, init, init, init, init, init, init, init, init, init, init, isAtomic, isInstanceOf, isPrivilegeCollectionRequired, isSessionSchema, isSessionSchema, makeConstantAction, makeTableName, makeTableName, nodeHeader, orReliability, parseStatement, printLabel, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, stackPrint, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Field Detail

UNARY_PLUS

private static final int UNARY_PLUS

See Also:

Constant Field Values

UNARY_MINUS

private static final int UNARY_MINUS

See Also:

Constant Field Values

SQRT

private static final int SQRT

See Also:

Constant Field Values

ABSOLUTE

private static final int ABSOLUTE

See Also:

Constant Field Values

UNARY_OPERATORS

private static final java.lang.String[] UNARY_OPERATORS

UNARY_METHODS

private static final java.lang.String[] UNARY_METHODS

operatorType

private int operatorType

Constructor Detail

UnaryArithmeticOperatorNode

public UnaryArithmeticOperatorNode()

Method Detail

init

public void init(java.lang.Object operand)

Initializer for a UnaryArithmeticOperatorNode

Specified by:

init in interface Node

Overrides:

init in class UnaryOperatorNode

Parameters:

operand - The operand of the node

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

public ValueNode bindExpression(FromList fromList,
                                SubqueryList subqueryList,
                                java.util.List aggregateVector)
                         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

aggregateVector - The aggregate vector 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

public 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

public 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