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

java.lang.Object
  extended byorg.apache.derby.impl.sql.compile.QueryTreeNode
      extended byorg.apache.derby.impl.sql.compile.JavaValueNode
          extended byorg.apache.derby.impl.sql.compile.MethodCallNode
              extended byorg.apache.derby.impl.sql.compile.NonStaticMethodCallNode
All Implemented Interfaces:
Visitable

public class NonStaticMethodCallNode
extends MethodCallNode

A NonStaticMethodCallNode is really a node to represent a (static or non-static) method call from an object (as opposed to a static method call from a class.


Field Summary
private  boolean isStatic
           
(package private)  JavaValueNode receiver
           
 
Fields inherited from class org.apache.derby.impl.sql.compile.MethodCallNode
actualMethodReturnType, internalCall, javaClassName, method, methodName, methodParameterTypes, methodParms, routineInfo, signature
 
Fields inherited from class org.apache.derby.impl.sql.compile.JavaValueNode
forCallStatement, jsqlType
 
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
NonStaticMethodCallNode()
           
 
Method Summary
 Visitable accept(Visitor v)
          Accept a visitor, and call v.visit() on child nodes as necessary.
 JavaValueNode bindExpression(FromList fromList, SubqueryList subqueryList, java.util.Vector aggregateVector)
          Bind this expression.
 boolean categorize(JBitSet referencedTabs, boolean simplePredsOnly)
          Categorize this predicate.
 void generateExpression(ExpressionClassBuilder acb, MethodBuilder mb)
          Do code generation for this method call
protected  boolean generateReceiver(ExpressionClassBuilder acb, MethodBuilder mb)
          Generate the expression that evaluates to the receiver.
protected  int getOrderableVariantType()
          Return the variant type for the underlying expression.
 void init(java.lang.Object methodName, java.lang.Object receiver)
          Initializer for a NonStaticMethodCallNode
 void preprocess(int numTables, FromList outerFromList, SubqueryList outerSubqueryList, PredicateList outerPredicateList)
          Preprocess an expression tree.
 void printSubNodes(int depth)
          Prints the sub-nodes of this object.
 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.MethodCallNode
addParms, addParms, areParametersQueryInvariant, bindParameters, generateOneParameter, generateParameters, getIsParam, getJavaClassName, getMethodName, getMethodParms, getObjectSignature, getParameterTypeName, getPrimitiveSignature, getSignature, init, resolveMethodCall, setClause, setNullParameterInfo, someParametersAreNull, throwNoMethodFound, toString
 
Methods inherited from class org.apache.derby.impl.sql.compile.JavaValueNode
castToPrimitive, checkReliability, generate, generateReceiver, getConstantValueAsObject, getJavaTypeName, getJSQLType, getPrimitiveTypeName, getReceiverExpression, isPrimitiveType, mapToTypeID, markForCallStatement, markReturnValueDiscarded, mustCastToPrimitive, returnValueDiscarded, returnValueToSQLDomain, setJavaTypeName, valueReturnedToSQLDomain
 
Methods inherited from class org.apache.derby.impl.sql.compile.QueryTreeNode
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, init, isAtomic, isInstanceOf, isSessionSchema, isSessionSchema, makeConstantAction, makeResultDescription, makeTableName, needsSavepoint, nodeHeader, optimize, parseQueryText, printLabel, referencesSessionSchema, 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

receiver

JavaValueNode receiver

isStatic

private boolean isStatic
Constructor Detail

NonStaticMethodCallNode

public NonStaticMethodCallNode()
Method Detail

init

public void init(java.lang.Object methodName,
                 java.lang.Object receiver)
          throws StandardException
Initializer for a NonStaticMethodCallNode

Overrides:
init in class QueryTreeNode
Parameters:
methodName - The name of the method to call
receiver - A JavaValueNode representing the receiving object
Throws:
StandardException - Thrown on error

bindExpression

public JavaValueNode 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.

Specified by:
bindExpression in class JavaValueNode
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:
this
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.Vector)

categorize

public boolean categorize(JBitSet referencedTabs,
                          boolean simplePredsOnly)
                   throws StandardException
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.

Overrides:
categorize in class MethodCallNode
Parameters:
referencedTabs - JBitSet with bit map of referenced FromTables
simplePredsOnly - 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.
Throws:
StandardException - Thrown on error

getOrderableVariantType

protected int getOrderableVariantType()
                               throws StandardException
Return the variant type for the underlying expression. The variant type can be: VARIANT - variant within a scan (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 expressions)

Overrides:
getOrderableVariantType in class MethodCallNode
Returns:
The variant type for the underlying expression.
Throws:
StandardException

remapColumnReferencesToExpressions

public JavaValueNode remapColumnReferencesToExpressions()
                                                 throws StandardException
Remap all ColumnReferences in this tree to be clones of the underlying expression.

Overrides:
remapColumnReferencesToExpressions in class MethodCallNode
Returns:
JavaValueNode The remapped expression tree.
Throws:
StandardException - Thrown on error

printSubNodes

public void printSubNodes(int depth)
Prints the sub-nodes of this object. See QueryTreeNode.java for how tree printing is supposed to work.

Overrides:
printSubNodes in class MethodCallNode
Parameters:
depth - The depth of this node in the tree
Returns:
Nothing

preprocess

public 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.

Overrides:
preprocess in class MethodCallNode
Parameters:
numTables - Number of tables in the DML Statement
outerFromList - FromList from outer query block
outerSubqueryList - SubqueryList from outer query block
outerPredicateList - PredicateList from outer query block
Returns:
Nothing.
Throws:
StandardException - Thrown on error

generateExpression

public void generateExpression(ExpressionClassBuilder acb,
                               MethodBuilder mb)
                        throws StandardException
Do code generation for this method call

Specified by:
generateExpression in class JavaValueNode
Parameters:
acb - The ExpressionClassBuilder for the class we're generating
mb - The method the expression will go into
Returns:
The compiled Expression
Throws:
StandardException - Thrown on error

generateReceiver

protected boolean generateReceiver(ExpressionClassBuilder acb,
                                   MethodBuilder mb)
                            throws StandardException
Generate the expression that evaluates to the receiver. This is for the case where a java expression is being returned to the SQL domain, and we need to check whether the receiver is null (if so, the SQL value should be set to null, and this Java expression not evaluated). Instance method calls and field references have receivers, while class method calls and calls to constructors do not. If this Java expression does not have a receiver, this method returns null. Only generate the receiver once and cache it in a field. This is because there will be two references to the receiver, and we want to evaluate it only once.

Overrides:
generateReceiver in class JavaValueNode
Parameters:
acb - The ExpressionClassBuilder for the class being built
mb - The method the expression will go into
Returns:
true if compiled receiver, false otherwise.
Throws:
StandardException - Thrown on error

accept

public Visitable accept(Visitor v)
                 throws StandardException
Accept a visitor, and call v.visit() on child nodes as necessary.

Specified by:
accept in interface Visitable
Overrides:
accept in class MethodCallNode
Parameters:
v - the visitor
Throws:
StandardException - on error


Apache Derby V10.0 Engine Documentation - Copyright © 1997,2004 The Apache Software Foundation or its licensors, as applicable.