net.sf.saffron.ext
Class ReflectSchema

java.lang.Object
  |
  +--net.sf.saffron.ext.ReflectSchema

All Implemented Interfaces:

SaffronSchema

public class ReflectSchema

extends Object

implements SaffronSchema

Schema which uses reflection to find definitions of tables.

Every public member (field or method) which implements SaffronTable can be used as a relation. Consider the following:

class SalesSchema extends ReflectSchema {
     public SaffronTable emps = JdbcTable(this, "EMP");
     public SaffronTable depts = JdbcTable(this, "DEPT");
 }
 class SalesConnection extends SaffronConnection {
     public static SaffronSchema getSaffronSchema() {
         return new SalesSchema();
     }
 }
 SalesConnection sales;
 Emp[] femaleEmps = (select from sales.emps as emp where emp.gender.equals("F"));
 

The expression sales.emps is a valid table because (a) sales is a SaffronConnection, (b) its static method getSaffronSchema() returns a ReflectSchema, and (c) ReflectSchema has a public field emps of type SaffronTable.

Since:

10 November, 2001

Version:

$Id: //open/saffron/src/net/sf/saffron/ext/ReflectSchema.java#6 $

Author:

jhyde

Field Summary

private Object	target
SaffronTypeFactoryImpl	typeFactory

Constructor Summary

ReflectSchema()
Creates a schema whose 'tables' are its own public fields.

ReflectSchema(Object target)
Creates a schema whose 'tables' are the public fields in a given object.

Method Summary

SaffronTable	getTableForMember(String[] names) Retrieves a SaffronTable based upon a member access.
SaffronTypeFactory	getTypeFactory() Returns the type factory used to generate types for this schema.
void	registerRules(SaffronPlanner planner) Registers all of the rules supported by this schema.

Methods inherited from class java.lang.Object

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

Field Detail

typeFactory

public final SaffronTypeFactoryImpl typeFactory

target

private final Object target

Constructor Detail

ReflectSchema

public ReflectSchema(Object target)

Creates a schema whose 'tables' are the public fields in a given object.

ReflectSchema

public ReflectSchema()

Creates a schema whose 'tables' are its own public fields.

Method Detail

getTableForMember

public SaffronTable getTableForMember(String[] names)

Description copied from interface: SaffronSchema

Retrieves a SaffronTable based upon a member access.

For example, the Saffron expression salesSchema.emps would be resolved using a call to salesSchema.getTableForMember(new String[]{"emps"}).

Note that name.length is only greater than 1 for queries originating from JDBC.

Specified by:

getTableForMember in interface SaffronSchema

getTypeFactory

public SaffronTypeFactory getTypeFactory()

Description copied from interface: SaffronSchema

Returns the type factory used to generate types for this schema.

Specified by:

getTypeFactory in interface SaffronSchema

registerRules

public void registerRules(SaffronPlanner planner)
                   throws Exception

Description copied from interface: SaffronSchema

Registers all of the rules supported by this schema. Only called by SaffronPlanner.registerSchema(net.sf.saffron.core.SaffronSchema).

Specified by:

registerRules in interface SaffronSchema

Exception