org.apache.derby.impl.sql.compile
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:

Node, Visitable

public 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

private static java.lang.String	DATE_METHOD_NAME
private static java.lang.String	TIMESTAMP_METHOD_NAME

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

UnaryDateTimestampOperatorNode()

Method Summary

ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List aggregateVector) Called by UnaryOperatorNode.bindExpression.
void	generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) Do code generation for this unary operator.
void	init(java.lang.Object operand, java.lang.Object targetType) Initialize a query tree node.
private void	invalidOperandType()

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

acceptChildren, addXmlOpMethodParams, bindOperand, bindParameter, categorize, constantExpression, getOperand, getOperatorString, getOrderableVariantType, getParameterOperand, getReceiverInterfaceName, init, 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, isParameterNode, isRelationalOperator, isSameNodeType, optimizableEqualityNode, putAndsOnTop, requiresTypeFromContext, selectivity, setCollationInfo, setCollationInfo, setCollationUsingCompilationSchema, setCollationUsingCompilationSchema, setNullability, setTransformed, setType, 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, 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

TIMESTAMP_METHOD_NAME

private static final java.lang.String TIMESTAMP_METHOD_NAME

See Also:

Constant Field Values

DATE_METHOD_NAME

private static final java.lang.String DATE_METHOD_NAME

See Also:

Constant Field Values

Constructor Detail

UnaryDateTimestampOperatorNode

public UnaryDateTimestampOperatorNode()

Method Detail

init

public void init(java.lang.Object operand,
                 java.lang.Object targetType)
          throws StandardException

Description copied from class: QueryTreeNode

Initialize a query tree node.

Specified by:

init in interface Node

Overrides:

init in class QueryTreeNode

Parameters:

operand - The operand of the function

targetType - The type of the result. Timestamp or Date.

Throws:

StandardException - Thrown on error

bindExpression

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

aggregateVector - The aggregate vector 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

public 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