org.eigenbase.sql.validate
Class SqlScopedShuttle

java.lang.Object
  org.eigenbase.sql.util.SqlBasicVisitor<SqlNode>
      org.eigenbase.sql.util.SqlShuttle
          org.eigenbase.sql.validate.SqlScopedShuttle

All Implemented Interfaces:

SqlVisitor<SqlNode>

Direct Known Subclasses:

SqlValidatorImpl.Expander, SqlValidatorImpl.OrderExpressionExpander, SqlValidatorUtil.DeepCopier

public abstract class SqlScopedShuttle
extends SqlShuttle

Refinement to SqlShuttle which maintains a stack of scopes.

Derived class should override visitScoped(SqlCall) rather than visit(SqlCall).

Since:

Jun 10, 2006

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/validate/SqlScopedShuttle.java#6 $

Author:

jhyde

Nested Class Summary

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlShuttle

SqlShuttle.CallCopyingArgHandler

Nested classes/interfaces inherited from class org.eigenbase.sql.util.SqlBasicVisitor

SqlBasicVisitor.ArgHandler<R>, SqlBasicVisitor.ArgHandlerImpl<R>

Field Summary

private Stack<SqlValidatorScope>

scopes

Constructor Summary

protected

SqlScopedShuttle(SqlValidatorScope initialScope)

Method Summary

protected SqlValidatorScope	getScope() Returns the current scope.
SqlNode	visit(SqlCall call) Visits a call to a SqlOperator.
protected SqlNode	visitScoped(SqlCall call) Visits an operator call.

Methods inherited from class org.eigenbase.sql.util.SqlShuttle

visit, visit, visit, visit, visit, visit

Methods inherited from class java.lang.Object

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

Field Detail

scopes

private final Stack<SqlValidatorScope> scopes

Constructor Detail

SqlScopedShuttle

protected SqlScopedShuttle(SqlValidatorScope initialScope)

Method Detail

visit

public final SqlNode visit(SqlCall call)

Description copied from interface: SqlVisitor

Visits a call to a SqlOperator.

Specified by:

visit in interface SqlVisitor<SqlNode>

Overrides:

visit in class SqlShuttle

Parameters:

call - Call

See Also:

SqlCall.accept(SqlVisitor)

visitScoped

protected SqlNode visitScoped(SqlCall call)

Visits an operator call. If the call has entered a new scope, the base class will have already modified the scope.

getScope

protected SqlValidatorScope getScope()

Returns the current scope.