org.apache.metamodel.query

Class FromClause

java.lang.Object

org.apache.metamodel.util.BaseObject

org.apache.metamodel.query.AbstractQueryClause<FromItem>

org.apache.metamodel.query.FromClause

All Implemented Interfaces:

Serializable, QueryClause<FromItem>

public class FromClause
extends AbstractQueryClause<FromItem>

Represents the FROM clause of a query containing FromItem's.

See Also:

FromItem, Serialized Form

Field Summary

Fields inherited from class org.apache.metamodel.query.AbstractQueryClause

DELIM_AND, DELIM_COMMA, PREFIX_FROM, PREFIX_GROUP_BY, PREFIX_HAVING, PREFIX_ORDER_BY, PREFIX_SELECT, PREFIX_WHERE

Constructor Summary

Constructors

Constructor and Description
FromClause(Query query)

Method Summary

Modifier and Type	Method and Description
String	getAlias(Table table) Gets the alias of a table, if it is registered (and visible, ie.
FromItem	getItemByReference(String reference) Retrieves a table by it's reference which may be it's alias or it's qualified table name.

Methods inherited from class org.apache.metamodel.query.AbstractQueryClause

addItem, addItem, addItems, addItems, decorateIdentity, getItem, getItemCount, getItems, indexOf, isEmpty, removeItem, removeItem, removeItems, setItems, toSql, toSql, toString

Methods inherited from class org.apache.metamodel.util.BaseObject

classEquals, equals, hashCode

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

FromClause

public FromClause(Query query)

Method Detail

getAlias

public String getAlias(Table table)

Gets the alias of a table, if it is registered (and visible, ie. not part of a sub-query) in the FromClause

Parameters:

table - the table to get the alias for

Returns:

the alias or null if none is found

getItemByReference

public FromItem getItemByReference(String reference)

Retrieves a table by it's reference which may be it's alias or it's qualified table name. Typically, this method is used to resolve a SelectItem with a reference like "foo.bar", where "foo" may either be an alias or a table name

Parameters:

reference -

Returns:

a FromItem which matches the provided reference string