Package org.datanucleus.store.query

Class JDOQLSingleStringParser

java.lang.Object

org.datanucleus.store.query.JDOQLSingleStringParser

public class JDOQLSingleStringParser
extends java.lang.Object

Parser for handling JDOQL Single-String queries. Takes a JDOQLQuery and the query string and parses it into its constituent parts, updating the JDOQLQuery accordingly with the result that after calling the parse() method the JDOQLQuery is populated.

 select [unique] [{result}] [into {result-class-name}]
                              [from {candidate-class-name} [exclude subclasses] ]
                              [where {filter}]
                              [variables {variables-clause} ]
                              [parameters {parameters-clause} ]
                              [{imports-clause}]
                              [group by {grouping-clause} ]
                              [order by {ordering-clause} ]
                              [range {from-range} ,{to-range}]                                       
 

or

 UPDATE {candidate-class-name} SET fld1 = val[, fld2 = val2] WHERE {filter}
 

or

 DELETE FROM {candidate-class-name} [exclude-subclasses] WHERE {filter}
 

Note that {filter} can contain subqueries, hence containing keywords

 SELECT c FROM Customer c WHERE timeAvailable < (SELECT avg(hours) FROM Employee e)
 

So the "filter" for the outer query is "timeAvailable < (SELECT avg(hours) FROM Employee e)"

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private class	JDOQLSingleStringParser.Compiler	Compiler to process keywords contents.
private static class	JDOQLSingleStringParser.Parser	Tokenizer that provides access to current token.

Field Summary

Fields

Modifier and Type	Field	Description
(package private) boolean	allowDelete
(package private) boolean	allowUpdate
private Query	query	The JDOQL query to populate.
private java.lang.String	queryString	The single-string query string.

Constructor Summary

Constructors

Constructor	Description
JDOQLSingleStringParser(Query query, java.lang.String queryString)	Constructor for the Single-String parser.

Method Summary

Modifier and Type	Method	Description
void	parse()	Method to parse the Single-String query
void	setAllowDelete(boolean allow)
void	setAllowUpdate(boolean allow)

Methods inherited from class java.lang.Object

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

Field Detail

query

private Query query

The JDOQL query to populate.

queryString

private java.lang.String queryString

The single-string query string.

allowDelete

boolean allowDelete

allowUpdate

boolean allowUpdate

Constructor Detail

JDOQLSingleStringParser

public JDOQLSingleStringParser(Query query,
                               java.lang.String queryString)

Constructor for the Single-String parser.

Parameters:

query - The query

queryString - The Single-String query

Method Detail

setAllowDelete

public void setAllowDelete(boolean allow)

setAllowUpdate

public void setAllowUpdate(boolean allow)

parse

public void parse()

Method to parse the Single-String query