Class UnaryDateTimestampOperatorNode

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.UnaryDateTimestampOperatorNode

All Implemented Interfaces:

Visitable

class UnaryDateTimestampOperatorNode
extends UnaryOperatorNode

This class implements the timestamp( x) and date(x) functions. These two functions implement a few special cases of string conversions beyond the normal string to date/timestamp casts.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	DATE_METHOD_NAME
(package private) static final int	K_DATE
(package private) static final int	K_TIMESTAMP
(package private) final int	kind	This class is used to hold logically different objects for space efficiency.
private static final String	TIMESTAMP_METHOD_NAME

Fields inherited from class UnaryOperatorNode

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

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
UnaryDateTimestampOperatorNode(ValueNode operand, int kind, ContextManager cm)

Method Summary

Modifier and Type	Method	Description
(package private) ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, List<AggregateNode> aggregates)	Called by UnaryOperatorNode.bindExpression.
(package private) void	generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)	Do code generation for this unary operator.
private void	invalidOperandType()
(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 UnaryOperatorNode

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

Methods inherited from class OperatorNode

pushSqlXmlUtil

Methods inherited from class 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, isParameterNode, isRelationalOperator, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, setType, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

Methods inherited from class 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 Object

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

Field Details

TIMESTAMP_METHOD_NAME

private static final String TIMESTAMP_METHOD_NAME

See Also:

• Constant Field Values

DATE_METHOD_NAME

private static final String DATE_METHOD_NAME

See Also:

• Constant Field Values

K_DATE

static final int K_DATE

See Also:

• Constant Field Values

K_TIMESTAMP

static final int K_TIMESTAMP

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

UnaryDateTimestampOperatorNode

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

Parameters:

operand - The operand of the function

kind - The kind of the result, Date or Timestamp.

cm - context manager

Throws:

StandardException

Method Details

bindExpression

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

Called by UnaryOperatorNode.bindExpression. If the operand is a constant then evaluate the function at compile time. Otherwise, if the operand input type is the same as the output type then discard this node altogether. If the function is "date" and the input is a timestamp then change this node to a cast.

Overrides:

bindExpression in class UnaryOperatorNode

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

invalidOperandType

private void invalidOperandType()
                         throws StandardException

Throws:

StandardException

generateExpression

void generateExpression(ExpressionClassBuilder acb,
 MethodBuilder mb)
                 throws StandardException

Do code generation for this unary 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

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 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.