org.eigenbase.sql.type
Class SqlTypeAssignmentRules

java.lang.Object
  org.eigenbase.sql.type.SqlTypeAssignmentRules

public class SqlTypeAssignmentRules
extends Object

Class to hold rules to determine if a type is assignable from another type.

REVIEW 7/05/04 Wael: We should split this up in Cast rules, symmetric and asymmetric assignable rules

Version:

$Id: //open/dev/farrago/src/org/eigenbase/sql/type/SqlTypeAssignmentRules.java#20 $

Author:

Wael Chatila

Field Summary

private static Map<SqlTypeName,Set<SqlTypeName>>	coerceRules
private static SqlTypeAssignmentRules	instance
private static Map<SqlTypeName,Set<SqlTypeName>>	rules

Constructor Summary

private

SqlTypeAssignmentRules()

Method Summary

boolean	canCastFrom(SqlTypeName to, SqlTypeName from, boolean coerce)
private static <K,V> HashMap<K,V>	copy(Map<K,V> map)
private static <T> HashSet<T>	copy(Set<T> set)
static SqlTypeAssignmentRules	instance()

Methods inherited from class java.lang.Object

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

Field Detail

instance

private static SqlTypeAssignmentRules instance

rules

private static Map<SqlTypeName,Set<SqlTypeName>> rules

coerceRules

private static Map<SqlTypeName,Set<SqlTypeName>> coerceRules

Constructor Detail

SqlTypeAssignmentRules

private SqlTypeAssignmentRules()

Method Detail

instance

public static SqlTypeAssignmentRules instance()

canCastFrom

public boolean canCastFrom(SqlTypeName to,
                           SqlTypeName from,
                           boolean coerce)

copy

private static <K,V> HashMap<K,V> copy(Map<K,V> map)

copy

private static <T> HashSet<T> copy(Set<T> set)