gudusoft.gsqlparser.resolver2.scope

Class EmptyScope

Object

gudusoft.gsqlparser.resolver2.scope.EmptyScope

All Implemented Interfaces:

IScope

public class EmptyScope
extends Object
implements IScope

Empty scope - terminates the scope chain. This is the parent of GlobalScope, providing base-case behavior. All resolution methods do nothing or return empty/null.

Field Summary

Fields

Modifier and Type	Field and Description
static EmptyScope	INSTANCE Singleton instance

Method Summary

Modifier and Type	Method and Description
void	addChild(INamespace namespace, String alias, boolean nullable) Add a child namespace to this scope.
QualifiedName	fullyQualify(String name) Fully qualify a name based on this scope.
List<ScopeChild>	getChildren() Get all child namespaces in this scope.
TParseTreeNode	getNode() Get the associated AST node
IScope	getParent() Get the parent scope.
ScopeType	getScopeType() Get the scope type
List<INamespace>	getVisibleNamespaces() Get all namespaces visible in this scope.
boolean	isWithin(IScope ancestorScope) Check if this scope is within (nested inside) another scope.
void	resolve(List<String> names, INameMatcher matcher, boolean deep, IResolved resolved) Resolve a qualified or unqualified name.
INamespace	resolveTable(String tableName) Resolve a table name or alias to its namespace.
String	toString()

Methods inherited from class Object

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

Field Detail

INSTANCE

public static final EmptyScope INSTANCE

Singleton instance

Method Detail

getParent

public IScope getParent()

Description copied from interface: IScope

Get the parent scope. Root scope (GlobalScope) has EmptyScope as parent.

Specified by:

getParent in interface IScope

Returns:

Parent scope, never null

getNode

public TParseTreeNode getNode()

Description copied from interface: IScope

Get the associated AST node

Specified by:

getNode in interface IScope

Returns:

AST node for this scope

getScopeType

public ScopeType getScopeType()

Description copied from interface: IScope

Get the scope type

Specified by:

getScopeType in interface IScope

Returns:

Scope type enum

resolve

public void resolve(List<String> names,
                    INameMatcher matcher,
                    boolean deep,
                    IResolved resolved)

Description copied from interface: IScope

Resolve a qualified or unqualified name. This is the core method for name resolution.

Specified by:

resolve in interface IScope

Parameters:

names - Name parts (e.g., ["schema", "table", "column"])

matcher - Name matcher for case sensitivity rules

deep - Whether to recursively resolve into record fields

resolved - Callback to collect all matches

resolveTable

public INamespace resolveTable(String tableName)

Description copied from interface: IScope

Resolve a table name or alias to its namespace.

Specified by:

resolveTable in interface IScope

Parameters:

tableName - Table name or alias

Returns:

Namespace if found, null otherwise

addChild

public void addChild(INamespace namespace,
                     String alias,
                     boolean nullable)

Description copied from interface: IScope

Add a child namespace to this scope. Typically used in FROM clauses to add tables/subqueries.

Specified by:

addChild in interface IScope

Parameters:

namespace - The namespace to add

alias - The alias for this namespace

nullable - Whether this namespace is nullable (e.g., RIGHT side of LEFT JOIN)

getChildren

public List<ScopeChild> getChildren()

Description copied from interface: IScope

Get all child namespaces in this scope.

Specified by:

getChildren in interface IScope

Returns:

List of scope children

getVisibleNamespaces

public List<INamespace> getVisibleNamespaces()

Description copied from interface: IScope

Get all namespaces visible in this scope. Includes children and namespaces from parent scopes.

Specified by:

getVisibleNamespaces in interface IScope

Returns:

List of visible namespaces

fullyQualify

public QualifiedName fullyQualify(String name)

Description copied from interface: IScope

Fully qualify a name based on this scope. E.g., "col" -> "table.col" if only one table has that column

Specified by:

fullyQualify in interface IScope

Parameters:

name - Name to qualify

Returns:

Qualified name

isWithin

public boolean isWithin(IScope ancestorScope)

Description copied from interface: IScope

Check if this scope is within (nested inside) another scope.

Specified by:

isWithin in interface IScope

Parameters:

ancestorScope - Potential ancestor scope

Returns:

true if this scope is nested within ancestorScope

toString

public String toString()

Overrides:

toString in class Object