saffron.rel
Class TypeFactoryImpl

java.lang.Object
  |
  +--saffron.rel.TypeFactoryImpl

All Implemented Interfaces:

TypeFactory

Direct Known Subclasses:

OJTypeFactoryImpl

public class TypeFactoryImpl

extends Object

implements TypeFactory

Implementation of TypeFactory.

Since:

May 31, 2003

Version:

$Id: //open/saffron/src/main/saffron/rel/TypeFactoryImpl.java#4 $

Author:

jhyde

Nested Class Summary

protected class	TypeFactoryImpl.CrossType Type of the cartesian product of two or more sets of records.
protected static class	TypeFactoryImpl.FieldImpl Simple implementation of Field
protected class	TypeFactoryImpl.RecordType Type which is a set of named fields.
protected class	TypeFactoryImpl.ScalarType Type which is based upon a Java class.
protected class	TypeFactoryImpl.TypeImpl Abstract implementation for Type.

Nested classes inherited from class saffron.rel.TypeFactory

TypeFactory.FieldInfo

Field Summary

private HashMap	map
private static ThreadLocal	threadInstances

Constructor Summary

TypeFactoryImpl()

Method Summary

private static void	addFields(Type type, ArrayList fieldList) Adds all fields in type to fieldList.
protected Type	canonize(Type type) Registers a type, or returns the existing type if it is already registered.
Type	createJavaType(Class clazz) Creates a type which encapsulates a Java class.
Type	createJoinType(Type[] types) Creates a cartesian product type.
Type	createProjectType(Type[] types, String[] fieldNames) Creates a type which represents a projection of a set of fields.
Type	createProjectType(TypeFactory.FieldInfo fieldInfo) Creates a type which represents a projection of a set fields, getting the field informatation from a callback.
private static Field[]	getFieldArray(Type[] types) Returns an array of the fields in an array of types.
private static Type[]	getTypeArray(Type[] types) Returns an array of all atomic types in an array.
private static void	getTypeArray(Type[] types, ArrayList typeList)
Type	leastRestrictive(Type[] types) Returns the most general of a set of types (that is, one type to which they can all be cast), or null if conversion is not possible.
static void	setThreadInstance(TypeFactory typeFactory)
static TypeFactory	threadInstance()

Methods inherited from class java.lang.Object

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

Field Detail

map

private HashMap map

threadInstances

private static ThreadLocal threadInstances

Constructor Detail

TypeFactoryImpl

public TypeFactoryImpl()

Method Detail

createProjectType

public Type createProjectType(Type[] types,
                              String[] fieldNames)

Description copied from interface: TypeFactory

Creates a type which represents a projection of a set of fields.

The return is canonical: if an equivalent type already exists, it is returned.

Specified by:

createProjectType in interface TypeFactory

Parameters:

types - Types of the fields

fieldNames - Names of the fields

Returns:

a type

createProjectType

public Type createProjectType(TypeFactory.FieldInfo fieldInfo)

Description copied from interface: TypeFactory

Creates a type which represents a projection of a set fields, getting the field informatation from a callback.

Specified by:

createProjectType in interface TypeFactory

createJoinType

public Type createJoinType(Type[] types)

Description copied from interface: TypeFactory

Creates a cartesian product type.

Specified by:

createJoinType in interface TypeFactory

createJavaType

public Type createJavaType(Class clazz)

Description copied from interface: TypeFactory

Creates a type which encapsulates a Java class.

Specified by:

createJavaType in interface TypeFactory

leastRestrictive

public Type leastRestrictive(Type[] types)

Description copied from interface: TypeFactory

Returns the most general of a set of types (that is, one type to which they can all be cast), or null if conversion is not possible.

Specified by:

leastRestrictive in interface TypeFactory

canonize

protected Type canonize(Type type)

Registers a type, or returns the existing type if it is already registered.

getTypeArray

private static Type[] getTypeArray(Type[] types)

Returns an array of all atomic types in an array.

getTypeArray

private static void getTypeArray(Type[] types,
                                 ArrayList typeList)

getFieldArray

private static Field[] getFieldArray(Type[] types)

Returns an array of the fields in an array of types.

addFields

private static void addFields(Type type,
                              ArrayList fieldList)

Adds all fields in type to fieldList.

setThreadInstance

public static void setThreadInstance(TypeFactory typeFactory)

threadInstance

public static TypeFactory threadInstance()