Package org.fryske_akademy.jpa

Class JpqlBuilderImpl

java.lang.Object

org.fryske_akademy.jpa.JpqlBuilderImpl

All Implemented Interfaces:

JpqlBuilder

@Singleton
public class JpqlBuilderImpl
extends Object
implements JpqlBuilder

Stateless, threadsafe builder containing functions for building jpql}. Supports all comparison expressions except "between" when building jpql.

Author:

eduard

Field Summary

Fields

Modifier and Type	Field	Description
static String	ENTITY_PREFIX

Constructor Summary

Constructors

Constructor	Description
JpqlBuilderImpl()

Method Summary

Modifier and Type	Method	Description
String	orderClause(Map<String,CrudReadService.SORTORDER> sort)	builds an order by clause, uses ENTITY_PREFIX.
protected void	set(javax.persistence.Query q, String key, Object value)	When the Query has the parameter "key" call Query.setParameter(java.lang.String, java.lang.Object) otherwise call Query.setParameter(int, java.lang.Object) with Short.valueOf(key), because then a positional parameter in a native query is assumed.
void	setParam(javax.persistence.Query q, Param param)	Fills parameters prepared in setWhereParams(javax.persistence.Query, java.util.List), if the type of the field in the query is a Short or an Integer and the paramValue is a String, it is converted accordingly.
void	setWhereParams(javax.persistence.Query q, List<Param> params)	Calls setParam(Query, Param) for each filter.
String	whereClause(List<Param> params)	builds a where clause, calls whereCondition(Param) for every entry.
String	whereCondition(Param param)	builds a where condition, prepares query parameters later filled in setWhereParams(javax.persistence.Query, java.util.List).

Methods inherited from class java.lang.Object

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

Field Detail

ENTITY_PREFIX

public static final String ENTITY_PREFIX

See Also:

Constant Field Values

Constructor Detail

JpqlBuilderImpl

public JpqlBuilderImpl()

Method Detail

orderClause

public String orderClause(Map<String,CrudReadService.SORTORDER> sort)

builds an order by clause, uses ENTITY_PREFIX.

Specified by:

orderClause in interface JpqlBuilder

Parameters:

sort -

Returns:

whereClause

public String whereClause(List<Param> params)

builds a where clause, calls whereCondition(Param) for every entry.

Specified by:

whereClause in interface JpqlBuilder

Parameters:

params -

Returns:

See Also:

JpqlBuilder.whereCondition(Param), JpqlBuilder.setWhereParams(javax.persistence.Query, java.util.List)

whereCondition

public String whereCondition(Param param)

builds a where condition, prepares query parameters later filled in setWhereParams(javax.persistence.Query, java.util.List). "member of" support for singular param value and for a collection as param value, when param value is a collection multiple "member of" conditions are generated. "between" is not supported.

Specified by:

whereCondition in interface JpqlBuilder

Parameters:

param -

Returns:

See Also:

JpqlBuilder.setWhereParams(javax.persistence.Query, java.util.List)

setWhereParams

public void setWhereParams(javax.persistence.Query q,
                           List<Param> params)

Calls setParam(Query, Param) for each filter.

Specified by:

setWhereParams in interface JpqlBuilder

Parameters:

q -

params -

set

protected void set(javax.persistence.Query q,
                   String key,
                   Object value)

When the Query has the parameter "key" call Query.setParameter(java.lang.String, java.lang.Object) otherwise call Query.setParameter(int, java.lang.Object) with Short.valueOf(key), because then a positional parameter in a native query is assumed. When the value is an OPERATOR use OPERATOR.getUserInput() as value.

Parameters:

q -

key -

value -

setParam

public void setParam(javax.persistence.Query q,
                     Param param)

Fills parameters prepared in setWhereParams(javax.persistence.Query, java.util.List), if the type of the field in the query is a Short or an Integer and the paramValue is a String, it is converted accordingly. For native queries Param.getParamKey() should be a numeric positional parameter. When the operator is member of and the value is a Collection a value is set for each entry in the collection, for this a parameter key Param.getParamKey() with an index number appended is assumed, whereCondition(Param) prepares this. For the type check either Parameter.getParameterType() is used, or, when null, Param.getParamType(). Via Param you have full control over the Object that is used as paramValue.

Specified by:

setParam in interface JpqlBuilder

Parameters:

q -

param -