org.fryske_akademy.ejb

Class JpqlBuilderImpl

java.lang.Object

org.fryske_akademy.ejb.JpqlBuilderImpl

All Implemented Interfaces:

JpqlBuilder

public class JpqlBuilderImpl
extends Object
implements JpqlBuilder

Stateless, threadsafe builder containing function for building dynamic jpql where and order by clause based on Param and functions for setting parameters in a Query, also based on Param. Supports all comparison expressions except between when building jpql.

Author:

eduard

Field Summary

Fields

Modifier and Type	Field and Description
static String	TABLE_ALIAS tabel alias used in building where and order by clause.

Constructor Summary

Constructors

Constructor and Description
JpqlBuilderImpl()

Method Summary

Modifier and Type	Method and Description
String	orderClause(Map<String,CrudReadService.SORTORDER> sort) builds an order by clause, uses TABLE_ALIAS as alias for the table
protected void	set(javax.persistence.Query q, String key, Object value) When Query is a TypedQuery call Query.setParameter(java.lang.String, java.lang.Object) otherwise call Query.setParameter(int, java.lang.Object) with Short.valueOf(key).
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(javax.persistence.Query, org.fryske_akademy.ejb.Param) for each filter.
String	whereClause(List<Param> params) builds a where clause, calls whereCondition(org.fryske_akademy.ejb.Param) for every entry, uses TABLE_ALIAS as alias for the table
String	whereCondition(Param param) builds a where condition, prepares ql 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

TABLE_ALIAS

public static final String TABLE_ALIAS

tabel alias used in building where and order by clause.

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 TABLE_ALIAS as alias for the table

Specified by:

orderClause in interface JpqlBuilder

Parameters:

sort -

Returns:

whereClause

public String whereClause(List<Param> params)

builds a where clause, calls whereCondition(org.fryske_akademy.ejb.Param) for every entry, uses TABLE_ALIAS as alias for the table

Specified by:

whereClause in interface JpqlBuilder

Parameters:

params -

Returns:

See Also:

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

whereCondition

public String whereCondition(Param param)

builds a where condition, prepares ql parameters later filled in setWhereParams(javax.persistence.Query, java.util.List). Collection as Param.getParamValue() with operator "member of" supported!, in that case multiple member of conditions will be constructed using a parameter key Param.getParamKey() with an index number appended, these parameters and later filled by setParam(javax.persistence.Query, org.fryske_akademy.ejb.Param). Supports all comparison operators in Param.getOperator() except between, for null and empty comparison Param.getNot() and Param.getParamValue() are ignored.

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(javax.persistence.Query, org.fryske_akademy.ejb.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 Query is a TypedQuery call Query.setParameter(java.lang.String, java.lang.Object) otherwise call Query.setParameter(int, java.lang.Object) with Short.valueOf(key).

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(org.fryske_akademy.ejb.Param) prepares this. For the type check either Parameter.getParameterType() is used, or, when null, Param.getParamType(). If the query does not contain the parameter and Param.isSkipSetValue() is true, the parameter isn't set. Via Param you have full control over the Object that is used as paramValue.

Specified by:

setParam in interface JpqlBuilder

Parameters:

q -

param -