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java.lang.Objectorg.apache.derby.impl.sql.compile.QueryTreeNode
org.apache.derby.impl.sql.compile.ValueNode
org.apache.derby.impl.sql.compile.CastNode
public class CastNode
An CastNode represents a cast expressionr.
Field Summary | |
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(package private) ValueNode |
castOperand
|
private boolean |
externallyGeneratedCastNode
This variable gets set by the parser to indiciate that this CAST node has been generated by the parser. |
private boolean |
forDataTypeFunction
|
(package private) TypeId |
sourceCTI
|
private int |
targetCharType
|
Fields inherited from class org.apache.derby.impl.sql.compile.ValueNode |
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transformed |
Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode |
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AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX, isPrivilegeCollectionRequired |
Constructor Summary | |
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CastNode()
|
Method Summary | |
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(package private) void |
acceptChildren(Visitor v)
Accept the visitor for all visitable children of this node. |
void |
bindCastNodeOnly()
Bind this node but not its child. |
ValueNode |
bindExpression(FromList fromList,
SubqueryList subqueryList,
java.util.Vector aggregateVector)
Bind this expression. |
boolean |
categorize(JBitSet referencedTabs,
boolean simplePredsOnly)
Categorize this predicate. |
boolean |
constantExpression(PredicateList whereClause)
Return whether or not this expression tree represents a constant value. |
private void |
genDataValueConversion(ExpressionClassBuilder acb,
MethodBuilder mb)
|
void |
generateExpression(ExpressionClassBuilder acb,
MethodBuilder mb)
Do code generation for this unary operator. |
private ValueNode |
getCastFromCharConstant(int destJDBCTypeId)
Get a constant representing the cast from a CHAR to another type. |
private ValueNode |
getCastFromIntegralType(long longValue,
int destJDBCTypeId)
Get a constant representing the cast from an integral type to another type. |
private ValueNode |
getCastFromNumericType(DataValueDescriptor constantValue,
int destJDBCTypeId)
Get a constant representing the cast from a non-integral type to another type. |
(package private) java.lang.Object |
getConstantValueAsObject()
Return an Object representing the bind time value of this expression tree. |
protected int |
getOrderableVariantType()
Return the variant type for the underlying expression. |
void |
init(java.lang.Object castOperand,
java.lang.Object castTarget)
Initializer for a CastNode |
void |
init(java.lang.Object castOperand,
java.lang.Object charType,
java.lang.Object charLength)
Initializer for a CastNode |
boolean |
isConstantExpression()
Return whether or not this expression tree represents a constant expression. |
protected boolean |
isEquivalent(ValueNode o)
Tests if this node is equivalent to the specified ValueNode. |
ValueNode |
preprocess(int numTables,
FromList outerFromList,
SubqueryList outerSubqueryList,
PredicateList outerPredicateList)
Preprocess an expression tree. |
void |
printSubNodes(int depth)
Prints the sub-nodes of this object. |
ValueNode |
remapColumnReferencesToExpressions()
Remap all ColumnReferences in this tree to be clones of the underlying expression. |
(package private) void |
setForDataTypeFunction(boolean b)
set this to be a dataTypeScalarFunction |
(package private) void |
setForExternallyGeneratedCASTnode()
This method gets called by the parser to indiciate that this CAST node has been generated by the parser. |
java.lang.String |
toString()
Convert this object to a String. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Field Detail |
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ValueNode castOperand
private int targetCharType
TypeId sourceCTI
private boolean forDataTypeFunction
private boolean externallyGeneratedCastNode
Constructor Detail |
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public CastNode()
Method Detail |
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public void init(java.lang.Object castOperand, java.lang.Object castTarget) throws StandardException
init
in class QueryTreeNode
castOperand
- The operand of the nodecastTarget
- DataTypeServices (target type of cast)
StandardException
- Thrown on errorpublic void init(java.lang.Object castOperand, java.lang.Object charType, java.lang.Object charLength) throws StandardException
init
in class QueryTreeNode
castOperand
- The operand of the nodecharType
- CHAR or VARCHAR JDBC type as targetcharLength
- target type length
StandardException
- Thrown on errorpublic java.lang.String toString()
toString
in class ValueNode
public void printSubNodes(int depth)
printSubNodes
in class QueryTreeNode
depth
- The depth of this node in the treeprotected int getOrderableVariantType() throws StandardException
ValueNode
getOrderableVariantType
in class ValueNode
StandardException
- Thrown on errorpublic ValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.Vector aggregateVector) throws StandardException
bindExpression
in class ValueNode
fromList
- The FROM list for the query this
expression is in, for binding columns.subqueryList
- The subquery list being built as we find SubqueryNodesaggregateVector
- The aggregate vector being built as we find AggregateNodes
StandardException
- Thrown on errorpublic void bindCastNodeOnly() throws StandardException
StandardException
- Thrown on errorprivate ValueNode getCastFromCharConstant(int destJDBCTypeId) throws StandardException
destJDBCTypeId
- The destination JDBC TypeId
StandardException
- Thrown on errorprivate ValueNode getCastFromIntegralType(long longValue, int destJDBCTypeId) throws StandardException
longValue
- integral type as a long to cast fromdestJDBCTypeId
- The destination JDBC TypeId
StandardException
- Thrown on errorprivate ValueNode getCastFromNumericType(DataValueDescriptor constantValue, int destJDBCTypeId) throws StandardException
constantValue
- non-integral type a a double to cast fromdestJDBCTypeId
- The destination JDBC TypeId
StandardException
- Thrown on errorpublic ValueNode preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException
preprocess
in class ValueNode
numTables
- Number of tables in the DML StatementouterFromList
- FromList from outer query blockouterSubqueryList
- SubqueryList from outer query blockouterPredicateList
- PredicateList from outer query block
StandardException
- Thrown on errorpublic boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly) throws StandardException
categorize
in class ValueNode
referencedTabs
- JBitSet with bit map of referenced FromTablessimplePredsOnly
- Whether or not to consider method
calls, field references and conditional nodes
when building bit map
StandardException
- Thrown on errorpublic ValueNode remapColumnReferencesToExpressions() throws StandardException
remapColumnReferencesToExpressions
in class ValueNode
StandardException
- Thrown on errorpublic boolean isConstantExpression()
isConstantExpression
in class ValueNode
public boolean constantExpression(PredicateList whereClause)
ValueNode
constantExpression
in class ValueNode
ValueNode.constantExpression(org.apache.derby.impl.sql.compile.PredicateList)
java.lang.Object getConstantValueAsObject() throws StandardException
getConstantValueAsObject
in class ValueNode
StandardException
- Thrown on errorpublic void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
generateExpression
in class ValueNode
acb
- The ExpressionClassBuilder for the class we're generatingmb
- The method the code to place the code
StandardException
- Thrown on errorprivate void genDataValueConversion(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
StandardException
void acceptChildren(Visitor v) throws StandardException
acceptChildren
in class QueryTreeNode
v
- the visitor
StandardException
- on errorvoid setForExternallyGeneratedCASTnode()
void setForDataTypeFunction(boolean b)
b
- true to use function conversion rulesprotected boolean isEquivalent(ValueNode o) throws StandardException
This method provides basic expression matching facility for the derived class of ValueNode and it is used by the language layer to compare the node structural form of the two expressions for equivalence at bind phase.
Note that it is not comparing the actual row values at runtime to produce a result; hence, when comparing SQL NULLs, they are considered to be equivalent and not unknown.
One usage case of this method in this context is to compare the select column expression against the group by expression to check if they are equivalent. e.g.:
SELECT c1+c2 FROM t1 GROUP BY c1+c2
In general, node equivalence is determined by the derived class of ValueNode. But they generally abide to the rules below:
isEquivalent
in class ValueNode
o
- the node to compare this ValueNode against.
true
if the two nodes are equivalent,
false
otherwise.
StandardException
|
Built on Thu 2011-03-10 11:54:14+0000, from revision ??? | ||||||||
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