org.apache.derby.impl.sql.compile
Class DefaultNode

java.lang.Object
  org.apache.derby.impl.sql.compile.QueryTreeNode
      org.apache.derby.impl.sql.compile.ValueNode
          org.apache.derby.impl.sql.compile.DefaultNode

All Implemented Interfaces:

Visitable

public class DefaultNode

extends ValueNode

DefaultNode represents a column/parameter default.

Field Summary

private java.lang.String	columnName
private java.lang.String	defaultText
private ValueNode	defaultTree

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

clause, dataTypeServices, IN_HAVING_CLAUSE, IN_SELECT_LIST, IN_UNKNOWN_CLAUSE, IN_WHERE_CLAUSE, transformed

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

AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, beginOffset, endOffset

Constructor Summary

DefaultNode()

Method Summary

ValueNode	bindExpression(FromList fromList, SubqueryList subqueryList, java.util.Vector aggregateVector) Bind this expression.
void	generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) Generate code for this calculation.
java.lang.String	getDefaultText() Get the text of the default.
(package private) ValueNode	getDefaultTree() Get the query tree for the default.
void	init(java.lang.Object columnName) Initializer for insert/update
void	init(java.lang.Object defaultTree, java.lang.Object defaultText) Initializer for a column/parameter default.
static ValueNode	parseDefault(java.lang.String defaultText, LanguageConnectionContext lcc, CompilerContext cc) Parse a default and turn it into a query tree.
java.lang.String	toString() Convert this object to a String.

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

bindExpression, categorize, changeToCNF, checkIsBoolean, checkReliability, checkReliability, checkTopPredicatesForEqualsConditions, constantExpression, copyFields, eliminateNots, genEqualsFalseTree, generate, generateFilter, genIsNullTree, genSQLJavaSQLTree, getClause, getClone, getColumnName, getConstantValueAsObject, getDataValueFactory, getOrderableVariantType, getSchemaName, getSourceResultColumn, getTableName, getTablesReferenced, getTransformed, getTypeCompiler, getTypeId, getTypeServices, init, isBinaryEqualsOperatorNode, isBooleanFalse, isBooleanTrue, isCloneable, isConstantExpression, isParameterNode, isRelationalOperator, optimizableEqualityNode, preprocess, putAndsOnTop, remapColumnReferencesToExpressions, selectivity, setClause, setDescriptor, setTransformed, setType, updatableByCursor, verifyChangeToCNF, verifyEliminateNots, verifyPutAndsOnTop

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

accept, bind, convertDefaultNode, debugFlush, debugPrint, executeSchemaName, executeStatementName, formatNodeString, foundString, generate, generateAuthorizeCheck, getBeginOffset, getClassFactory, getCompilerContext, getContextManager, getCursorInfo, getDataDictionary, getDependencyManager, getEndOffset, getExecutionFactory, getGenericConstantActionFactory, getIntProperty, getLanguageConnectionContext, getNodeFactory, getNodeType, getNullNode, getParameterTypes, getRowEstimate, getSchemaDescriptor, getSchemaDescriptor, getSPSName, getStatementType, getTableDescriptor, getTypeCompiler, init, init, init, init, init, init, init, init, init, init, init, isAtomic, isInstanceOf, isSessionSchema, isSessionSchema, makeConstantAction, makeResultDescription, makeTableName, needsSavepoint, nodeHeader, optimize, parseQueryText, printLabel, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setContextManager, setEndOffset, setNodeType, setRefActionInfo, treePrint, treePrint, verifyClassExist

Methods inherited from class java.lang.Object

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

Field Detail

columnName

private java.lang.String columnName

defaultText

private java.lang.String defaultText

defaultTree

private ValueNode defaultTree

Constructor Detail

DefaultNode

public DefaultNode()

Method Detail

init

public void init(java.lang.Object defaultTree,
                 java.lang.Object defaultText)

Initializer for a column/parameter default.

Overrides:

init in class QueryTreeNode

Parameters:

defaultTree - Query tree for default

defaultText - The text of the default.

init

public void init(java.lang.Object columnName)

Initializer for insert/update

Overrides:

init in class QueryTreeNode

getDefaultText

public java.lang.String getDefaultText()

Get the text of the default.

getDefaultTree

ValueNode getDefaultTree()

Get the query tree for the default.

Returns:

The query tree for the default.

toString

public java.lang.String toString()

Convert this object to a String. See comments in QueryTreeNode.java for how this should be done for tree printing.

Overrides:

toString in class ValueNode

Returns:

This object as a String

bindExpression

public ValueNode bindExpression(FromList fromList,
                                SubqueryList subqueryList,
                                java.util.Vector aggregateVector)
                         throws StandardException

Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression. In this case, there are no sub-expressions, and the return type is already known, so this is just a stub.

Overrides:

bindExpression in class ValueNode

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 failure

parseDefault

public static ValueNode parseDefault(java.lang.String defaultText,
                                     LanguageConnectionContext lcc,
                                     CompilerContext cc)
                              throws StandardException

Parse a default and turn it into a query tree.

Parameters:

defaultText - Text of Default.

lcc - LanguageConnectionContext

cc - CompilerContext

Returns:

The parsed default as a query tree.

Throws:

StandardException - Thrown on failure

generateExpression

public void generateExpression(ExpressionClassBuilder acb,
                               MethodBuilder mb)
                        throws StandardException

Description copied from class: ValueNode

Generate code for this calculation. This is a place-holder method - it should not be called.

Overrides:

generateExpression in class ValueNode

Parameters:

mb - The method the expression will go into

Throws:

StandardException - Thrown on failure