org.eigenbase.sql.util
Class ChainedSqlOperatorTable

java.lang.Object
  org.eigenbase.sql.util.ChainedSqlOperatorTable

All Implemented Interfaces:

SqlOperatorTable

Direct Known Subclasses:

MockSqlOperatorTable

public class ChainedSqlOperatorTable
extends Object
implements SqlOperatorTable

ChainedSqlOperatorTable implements the SqlOperatorTable interface by chaining together any number of underlying operator table instances.

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/util/ChainedSqlOperatorTable.java#14 $

Author:

John V. Sichi

Field Summary

private List<SqlOperatorTable>

tableList

Constructor Summary

ChainedSqlOperatorTable()
Creates a new empty table.

Method Summary

void	add(SqlOperatorTable table) Adds an underlying table.
List<SqlOperator>	getOperatorList() Retrieves a list of all functions and operators in this table.
List<SqlOperator>	lookupOperatorOverloads(SqlIdentifier opName, SqlFunctionCategory category, SqlSyntax syntax) Retrieves a list of operators with a given name and syntax.

Methods inherited from class java.lang.Object

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

Field Detail

tableList

private final List<SqlOperatorTable> tableList

Constructor Detail

ChainedSqlOperatorTable

public ChainedSqlOperatorTable()

Creates a new empty table.

Method Detail

add

public void add(SqlOperatorTable table)

Adds an underlying table. The order in which tables are added is significant; tables added earlier have higher lookup precedence. A table is not added if it is already on the list.

Parameters:

table - table to add

lookupOperatorOverloads

public List<SqlOperator> lookupOperatorOverloads(SqlIdentifier opName,
                                                 SqlFunctionCategory category,
                                                 SqlSyntax syntax)

Description copied from interface: SqlOperatorTable

Retrieves a list of operators with a given name and syntax. For example, by passing SqlSyntax.Function, the returned list is narrowed to only matching SqlFunction objects.

Specified by:

lookupOperatorOverloads in interface SqlOperatorTable

Parameters:

opName - name of operator

category - function category to look up, or null for any matching operator

syntax - syntax type of operator

Returns:

mutable list of SqlOperator objects (or immutable empty list if no matches)

getOperatorList

public List<SqlOperator> getOperatorList()

Description copied from interface: SqlOperatorTable

Retrieves a list of all functions and operators in this table. Used for automated testing.

Specified by:

getOperatorList in interface SqlOperatorTable

Returns:

list of SqlOperator objects