Class StaticClassFieldReferenceNode
- java.lang.Object
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- org.apache.derby.impl.sql.compile.QueryTreeNode
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- org.apache.derby.impl.sql.compile.JavaValueNode
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- org.apache.derby.impl.sql.compile.StaticClassFieldReferenceNode
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- All Implemented Interfaces:
Visitable
public final class StaticClassFieldReferenceNode extends JavaValueNode
A StaticClassFieldReferenceNode represents a Java static field reference from a Class (as opposed to an Object). Field references can be made in DML (as expressions).
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Field Summary
Fields Modifier and Type Field Description private boolean
classNameDelimitedIdentifier
private java.lang.reflect.Member
field
The field we are going to access.private java.lang.String
fieldName
private java.lang.String
javaClassName
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Fields inherited from class org.apache.derby.impl.sql.compile.JavaValueNode
forCallStatement, jsqlType
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Fields inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
AUTOINCREMENT_CREATE_MODIFY, AUTOINCREMENT_CYCLE, AUTOINCREMENT_INC_INDEX, AUTOINCREMENT_IS_AUTOINCREMENT_INDEX, AUTOINCREMENT_START_INDEX
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Constructor Summary
Constructors Constructor Description StaticClassFieldReferenceNode(java.lang.String javaClassName, java.lang.String fieldName, boolean classNameDelimitedIdentifier, ContextManager cm)
Constructor for a StaticClassFieldReferenceNode
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description (package private) JavaValueNode
bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates)
Bind this expression.(package private) boolean
categorize(JBitSet referencedTabs, boolean simplePredsOnly)
Categorize this predicate.(package private) void
generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)
General logic shared by Core compilation and by the Replication Filter compiler.(package private) int
getOrderableVariantType()
Return the variant type for the underlying expression.(package private) void
preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList)
Preprocess an expression tree.(package private) JavaValueNode
remapColumnReferencesToExpressions()
Remap all ColumnReferences in this tree to be clones of the underlying expression.-
Methods inherited from class org.apache.derby.impl.sql.compile.JavaValueNode
castToPrimitive, checkReliability, generate, generateReceiver, generateReceiver, getCollationType, getConstantValueAsObject, getDataType, getJavaTypeName, getJSQLType, getPrimitiveTypeName, getReceiverExpression, isPrimitiveType, mapToTypeID, markForCallStatement, markReturnValueDiscarded, mustCastToPrimitive, returnValueDiscarded, returnValueToSQLDomain, setCollationType, setJavaTypeName, valueReturnedToSQLDomain
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Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
accept, acceptChildren, 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, printSubNodes, referencesSessionSchema, resolveTableToSynonym, setBeginOffset, setEndOffset, setRefActionInfo, stackPrint, taggedWith, toString, treePrint, treePrint, verifyClassExist
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Constructor Detail
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StaticClassFieldReferenceNode
StaticClassFieldReferenceNode(java.lang.String javaClassName, java.lang.String fieldName, boolean classNameDelimitedIdentifier, ContextManager cm)
Constructor for a StaticClassFieldReferenceNode- Parameters:
javaClassName
- The class namefieldName
- The field namecm
- The context manager
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Method Detail
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bindExpression
JavaValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.List<AggregateNode> aggregates) throws StandardException
Bind this expression. This means binding the sub-expressions, as well as figuring out what the return type is for this expression.- Specified by:
bindExpression
in classJavaValueNode
- Parameters:
fromList
- The FROM list for the query this expression is in, for binding columns.subqueryList
- The subquery list being built as we find SubqueryNodesaggregates
- The aggregate list being built as we find AggregateNodes- Returns:
- Nothing
- Throws:
StandardException
- Thrown on error- See Also:
ValueNode.bindExpression(org.apache.derby.impl.sql.compile.FromList, org.apache.derby.impl.sql.compile.SubqueryList, java.util.List<org.apache.derby.impl.sql.compile.AggregateNode>)
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preprocess
void preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList) throws StandardException
Preprocess an expression tree. We do a number of transformations here (including subqueries, IN lists, LIKE and BETWEEN) plus subquery flattening. NOTE: This is done before the outer ResultSetNode is preprocessed.- Specified by:
preprocess
in classJavaValueNode
- Parameters:
numTables
- Number of tables in the DML StatementouterFromList
- FromList from outer query blockouterSubqueryList
- SubqueryList from outer query blockouterPredicateList
- PredicateList from outer query block- Throws:
StandardException
- Thrown on error- See Also:
ValueNode.preprocess(int, org.apache.derby.impl.sql.compile.FromList, org.apache.derby.impl.sql.compile.SubqueryList, org.apache.derby.impl.sql.compile.PredicateList)
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categorize
boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly)
Categorize this predicate. Initially, this means building a bit map of the referenced tables for each predicate. If the source of this ColumnReference (at the next underlying level) is not a ColumnReference or a VirtualColumnNode then this predicate will not be pushed down. For example, in: select * from (select 1 from s) a (x) where x = 1 we will not push down x = 1. NOTE: It would be easy to handle the case of a constant, but if the inner SELECT returns an arbitrary expression, then we would have to copy that tree into the pushed predicate, and that tree could contain subqueries and method calls. RESOLVE - revisit this issue once we have views.- Specified by:
categorize
in classJavaValueNode
- Parameters:
referencedTabs
- JBitSet with bit map of referenced FromTablessimplePredsOnly
- Whether or not to consider method calls, field references and conditional nodes when building bit map- Returns:
- boolean Whether or not source.expression is a ColumnReference or a VirtualColumnNode.
- See Also:
ValueNode.categorize(org.apache.derby.iapi.util.JBitSet, boolean)
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remapColumnReferencesToExpressions
JavaValueNode remapColumnReferencesToExpressions() throws StandardException
Remap all ColumnReferences in this tree to be clones of the underlying expression.- Specified by:
remapColumnReferencesToExpressions
in classJavaValueNode
- Returns:
- JavaValueNode The remapped expression tree.
- Throws:
StandardException
- Thrown on error- See Also:
ValueNode.remapColumnReferencesToExpressions()
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getOrderableVariantType
int getOrderableVariantType()
Return the variant type for the underlying expression. The variant type can be: VARIANT - variant within a scan (method calls and non-static field access) SCAN_INVARIANT - invariant within a scan (column references from outer tables) QUERY_INVARIANT - invariant within the life of a query CONSTANT - constant- Overrides:
getOrderableVariantType
in classJavaValueNode
- Returns:
- The variant type for the underlying expression.
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generateExpression
void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb) throws StandardException
Description copied from class:JavaValueNode
General logic shared by Core compilation and by the Replication Filter compiler. Every child of ValueNode must implement one of these methods.- Specified by:
generateExpression
in classJavaValueNode
- Parameters:
acb
- The ExpressionClassBuilder for the class being builtmb
- the method the expression will go into- Throws:
StandardException
- Thrown on error- See Also:
QueryTreeNode.generate(org.apache.derby.impl.sql.compile.ActivationClassBuilder, org.apache.derby.iapi.services.compiler.MethodBuilder)
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