net.sf.saffron.core
Class EmptySaffronConnection

java.lang.Object
  |
  +--net.sf.saffron.core.EmptySaffronConnection

All Implemented Interfaces:

SaffronConnection

public class EmptySaffronConnection

extends Object

implements SaffronConnection

A saffron connection which doesn't have any objects available.

A statement which uses this connection will only be able to reference statement parameters.

Since:

Nov 28, 2003

Version:

$Id: $

Author:

jhyde

See Also:

SaffronConnection

Nested Class Summary

private static class

EmptySaffronConnection.EmptySaffronSchema

Field Summary

private EmptySaffronConnection.EmptySaffronSchema

schema

Constructor Summary

EmptySaffronConnection()

Method Summary

Object	contentsAsArray(String qualifier, String tableName) In theory, this method returns the contents of tableName as an array; in practice, it is a placeholder recognized by the optimizer to do something much more efficient.
SaffronSchema	getSaffronSchema() Returns the schema underlying this connection.

Methods inherited from class java.lang.Object

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

Field Detail

schema

private final EmptySaffronConnection.EmptySaffronSchema schema

Constructor Detail

EmptySaffronConnection

public EmptySaffronConnection()

Method Detail

getSaffronSchema

public SaffronSchema getSaffronSchema()

Description copied from interface: SaffronConnection

Returns the schema underlying this connection. Non-abstract classes implementing this interface must also provide public static Schema getSaffronSchemaStatic().

Specified by:

getSaffronSchema in interface SaffronConnection

contentsAsArray

public Object contentsAsArray(String qualifier,
                              String tableName)

Description copied from interface: SaffronConnection

In theory, this method returns the contents of tableName as an array; in practice, it is a placeholder recognized by the optimizer to do something much more efficient. This involves calling SaffronSchema.getTableForMember(java.lang.String[])(qualifier,tableName).SaffronTable.toRel(net.sf.saffron.opt.VolcanoCluster, net.sf.saffron.core.SaffronConnection)(cluster, exp).

Specified by:

contentsAsArray in interface SaffronConnection