org.apache.metamodel.query.parser

Class SelectItemParser

java.lang.Object

org.apache.metamodel.query.parser.SelectItemParser

All Implemented Interfaces:

QueryPartProcessor

public final class SelectItemParser
extends Object
implements QueryPartProcessor

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SelectItemParser.MultipleSelectItemsParsedException

Constructor Summary

Constructors

Constructor and Description
SelectItemParser(Query query, boolean allowExpressionBasedSelectItems)

Method Summary

Modifier and Type	Method and Description
SelectItem	findSelectItem(String expression) Finds/creates a SelectItem based on the given expression.
void	parse(String delim, String itemToken) Method invoked whenever the QueryPartParser identifies a token.

Methods inherited from class java.lang.Object

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

Constructor Detail

SelectItemParser

public SelectItemParser(Query query,
                        boolean allowExpressionBasedSelectItems)

Method Detail

parse

public void parse(String delim,
                  String itemToken)
           throws MetaModelException

Description copied from interface: QueryPartProcessor

Method invoked whenever the QueryPartParser identifies a token.

Specified by:

parse in interface QueryPartProcessor

Parameters:

delim - the (previous) delimitor identified before the token. This will always be null in case of the first token.

itemToken - the token identified.

Throws:

MetaModelException

findSelectItem

public SelectItem findSelectItem(String expression)
                          throws SelectItemParser.MultipleSelectItemsParsedException

Finds/creates a SelectItem based on the given expression. Unlike the parse(String, String) method, this method will not actually add the selectitem to the query.

Parameters:

expression -

Returns:

Throws:

SelectItemParser.MultipleSelectItemsParsedException - if an expression yielding multiple select-items (such as "*") was passed in the expression