org.exolab.castor.jdo.drivers
Class HsqlQueryExpression.HsqlAliasInfo
java.lang.Object
org.exolab.castor.jdo.drivers.HsqlQueryExpression.HsqlAliasInfo
- HsqlQueryExpression
(package private) final class HsqlQueryExpression.HsqlAliasInfo
extends java.lang.Object
This class encapsulates the information of the aliases related to sql
outer joins. This class is defined as inner to easily see the Join class.
A further refactoring should make this class a top-level class
String | getAliasFor(String table, JDBCQueryExpression.Join join) - Get the alias for the given table and join
|
Hashtable | getAliasHash(String table) - Get the hash of aliases for the given table
|
String | getAnAliasFor(String table) - Return any alias for the given table
|
Enumeration | getTables() - Return a list of the tables involved in more than one outer join and
they need an alias
|
boolean | tableExists(String table) - Check if the given table is involved in more thatn one oter join
|
HsqlAliasInfo
public HsqlAliasInfo(Vector joins)
Public constructor. This builds an alias info class from the joins
participating in a query
getAliasFor
public String getAliasFor(String table,
JDBCQueryExpression.Join join)
Get the alias for the given table and join
table
- a not null table name that may participate in more than one
outer joinjoin
- a not null join name in which the given table participates
given table
- the alias for the input table and join; or null if the table has
no aliases because it does not participate in more than one outer join
getAliasHash
public Hashtable getAliasHash(String table)
Get the hash of aliases for the given table
- a Hashtable instance which keys are the join objects and the
values are the alias names for the given table. If the table has no
aliases it returns null
getAnAliasFor
public String getAnAliasFor(String table)
Return any alias for the given table
- an alias for the input table; or null if the table has no aliases
because it does not participate in more than one outer join
getTables
public Enumeration getTables()
Return a list of the tables involved in more than one outer join and
they need an alias
tableExists
public boolean tableExists(String table)
Check if the given table is involved in more thatn one oter join
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