com.impetus.kundera.query

Class KunderaQueryParser

java.lang.Object

com.impetus.kundera.query.KunderaQueryParser

public class KunderaQueryParser
extends Object

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

 SELECT [ {result} ]
 [FROM {candidate-classes} ]
 [WHERE {filter}]
 [GROUP BY {grouping-clause} ]
 [HAVING {having-clause} ]
 [ORDER BY {ordering-clause}]
 e.g SELECT c FROM Customer c INNER JOIN c.orders o WHERE c.status = 1
 

Author:

animesh.kumar

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
private class	KunderaQueryParser.Compiler Compiler to process keywords contents.

Field Summary

Fields

Modifier and Type	Field and Description
private static org.slf4j.Logger	logger The logger.
private KunderaQuery	query The JPQL query to populate.
private String	queryString The single-string query string.

Constructor Summary

Constructors

Constructor and Description
KunderaQueryParser(KunderaQuery query) Constructor for the Single-String parser.

Method Summary

Methods

Modifier and Type	Method and Description
private void	buildFrom()
private int	buildResult(String[] result, int count, String property)
private void	buildResultColumns()
private int	countAggregation(org.eclipse.persistence.jpa.jpql.parser.Expression selectExpression)
private boolean	isKeyword(String token) Method to detect whether this token is a keyword for JPQL Single-String.
void	parse() Method to parse the Single-String query.
private boolean	validateExpression(org.eclipse.persistence.jpa.jpql.parser.Expression expression)

Methods inherited from class java.lang.Object

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

Field Detail

query

private KunderaQuery query

The JPQL query to populate.

queryString

private String queryString

The single-string query string.

logger

private static org.slf4j.Logger logger

The logger.

Constructor Detail

KunderaQueryParser

public KunderaQueryParser(KunderaQuery query)

Constructor for the Single-String parser.

Parameters:

query - The query

queryString - The Single-String query

Method Detail

parse

public final void parse()

Method to parse the Single-String query.

isKeyword

private boolean isKeyword(String token)

Method to detect whether this token is a keyword for JPQL Single-String.

Parameters:

token - The token

Returns:

Whether it is a keyword

buildResultColumns

private void buildResultColumns()

countAggregation

private int countAggregation(org.eclipse.persistence.jpa.jpql.parser.Expression selectExpression)

Parameters:

selectExpression -

Returns:

Count of aggregation required

validateExpression

private boolean validateExpression(org.eclipse.persistence.jpa.jpql.parser.Expression expression)

buildResult

private int buildResult(String[] result,
              int count,
              String property)

buildFrom

private void buildFrom()