net.sf.saffron.sql
Class SqlValidator.Scope

java.lang.Object
  |
  +--net.sf.saffron.sql.SqlValidator.Scope

Direct Known Subclasses:

SqlValidator.IdentifierScope, SqlValidator.JoinScope, SqlValidator.SelectScope, SqlValidator.SetopScope, SqlValidator.TableConstructorScope

Enclosing class:

SqlValidator

public abstract class SqlValidator.Scope

extends Object

Name-resolution scope. Represents any position in a parse tree than an expression can be, or anything in the parse tree which has columns.

Field Summary

private String	alias
SqlValidator.Scope	parent

Constructor Summary

(package private)

SqlValidator.Scope(SqlValidator.Scope parent, String alias)

Method Summary

String	deriveAlias(SqlNode node, int ordinal)
protected String	findQualifyingTableName(String columnName)
SqlIdentifier	fullyQualify(SqlIdentifier identifier) Converts an identifier into a fully-qualified identifier.
String	getAlias()
(package private) abstract SqlNode	getNode()
abstract SaffronType	getRowType() Returns a list of names of output columns.
SqlValidator.Scope	getScopeFromNode(SqlNode node)
SqlValidator.Table	getTable() Returns the underlying table, or null if there is none.
SqlValidator.Scope	resolve(String name, SqlValidator.Scope[] ancestorOut, int[] offsetOut) Looks up a node with a given name.
void	validate()

Methods inherited from class java.lang.Object

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

Field Detail

parent

public final SqlValidator.Scope parent

alias

private final String alias

Constructor Detail

SqlValidator.Scope

SqlValidator.Scope(SqlValidator.Scope parent,
                   String alias)

Method Detail

getAlias

public String getAlias()

getScopeFromNode

public SqlValidator.Scope getScopeFromNode(SqlNode node)

deriveAlias

public String deriveAlias(SqlNode node,
                          int ordinal)

fullyQualify

public SqlIdentifier fullyQualify(SqlIdentifier identifier)

Converts an identifier into a fully-qualified identifier. For example, the "empno" in "select empno from emp natural join dept" becomes "emp.empno".

validate

public void validate()

getNode

abstract SqlNode getNode()

resolve

public SqlValidator.Scope resolve(String name,
                                  SqlValidator.Scope[] ancestorOut,
                                  int[] offsetOut)

Looks up a node with a given name. Returns null if none is found.

Parameters:

name - Name of node to find

ancestorOut - If not null, writes the ancestor scope here

offsetOut - If not null, writes the offset within the ancestor here

getTable

public SqlValidator.Table getTable()

Returns the underlying table, or null if there is none.

findQualifyingTableName

protected String findQualifyingTableName(String columnName)

getRowType

public abstract SaffronType getRowType()

Returns a list of names of output columns.