org.teiid.query.sql.visitor

Class FunctionCollectorVisitor

java.lang.Object

org.teiid.query.sql.LanguageVisitor

org.teiid.query.sql.visitor.FunctionCollectorVisitor

public class FunctionCollectorVisitor
extends LanguageVisitor

This visitor class will traverse a language object tree and collect all Function references it finds. It uses a collection to collect the Functions in so different collections will give you different collection properties - for instance, using a Set will remove duplicates.

This visitor can optionally collect functions of only a specific name

The easiest way to use this visitor is to call the static methods which create the visitor (and possibly the collection), run the visitor, and return the collection. The public visit() methods should NOT be called directly.

Constructor Summary

Constructors

Constructor and Description
FunctionCollectorVisitor(Collection<Function> functions) Construct a new visitor with the specified collection, which should be non-null.
FunctionCollectorVisitor(Collection<Function> functions, String functionName) Construct a new visitor with the specified collection, which should be non-null.

Method Summary

Modifier and Type	Method and Description
Collection<Function>	getFunctions() Get the elements collected by the visitor.
static Collection<Function>	getFunctions(LanguageObject obj, boolean removeDuplicates) Helper to quickly get the elements from obj in a collection.
static Collection<Function>	getFunctions(LanguageObject obj, boolean removeDuplicates, boolean deep)
static void	getFunctions(LanguageObject obj, Collection<Function> functions) Helper to quickly get the elements from obj in the elements collection
static void	getFunctions(LanguageObject obj, Collection<Function> functions, boolean deep) Helper to quickly get the elements from obj in the elements collection
static boolean	isNonDeterministic(LanguageObject ex) Checks to see if the object is non-deterministic iff all function are non-deterministic, and all correlated subqueries are deterministic
void	visit(Function obj) Visit a language object and collect symbols.

Methods inherited from class org.teiid.query.sql.LanguageVisitor

setAbort, shouldAbort, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionCollectorVisitor

public FunctionCollectorVisitor(Collection<Function> functions)

Construct a new visitor with the specified collection, which should be non-null.

Parameters:

functions - Collection to use for functions

Throws:

IllegalArgumentException - If elements is null

FunctionCollectorVisitor

public FunctionCollectorVisitor(Collection<Function> functions,
                                String functionName)

Construct a new visitor with the specified collection, which should be non-null.

Parameters:

functions - Collection to use for functions

Throws:

IllegalArgumentException - If elements is null

Method Detail

getFunctions

public Collection<Function> getFunctions()

Get the elements collected by the visitor. This should best be called after the visitor has been run on the language object tree.

Returns:

Collection of ElementSymbol

visit

public void visit(Function obj)

Visit a language object and collect symbols. This method should NOT be called directly.

Overrides:

visit in class LanguageVisitor

Parameters:

obj - Language object

getFunctions

public static final void getFunctions(LanguageObject obj,
                                      Collection<Function> functions)

Helper to quickly get the elements from obj in the elements collection

Parameters:

obj - Language object

functions - Collection to collect functions in

getFunctions

public static final void getFunctions(LanguageObject obj,
                                      Collection<Function> functions,
                                      boolean deep)

Helper to quickly get the elements from obj in the elements collection

Parameters:

obj - Language object

functions - Collection to collect functions in

getFunctions

public static final Collection<Function> getFunctions(LanguageObject obj,
                                                      boolean removeDuplicates)

Helper to quickly get the elements from obj in a collection. The removeDuplicates flag affects whether duplicate elements will be filtered out.

Parameters:

obj - Language object

removeDuplicates - True to remove duplicates

Returns:

Collection of ElementSymbol

getFunctions

public static final Collection<Function> getFunctions(LanguageObject obj,
                                                      boolean removeDuplicates,
                                                      boolean deep)

isNonDeterministic

public static boolean isNonDeterministic(LanguageObject ex)

Checks to see if the object is non-deterministic iff all function are non-deterministic, and all correlated subqueries are deterministic

Parameters:

ex -

Returns: