org.cyclos.impl.utils

Class QueryHelper

java.lang.Object

org.cyclos.impl.utils.QueryHelper

public class QueryHelper
extends java.lang.Object

Contains helper methods for querydsl

Author:

luis

Constructor Summary

Constructors

Constructor and Description
QueryHelper()

Method Summary

Modifier and Type	Method and Description
static <T> Page<T>	buildPage(SessionData sessionData, java.util.List<T> list, java.lang.Integer _currentPage, java.lang.Integer _pageSize) Builds a page from an in-memory list
static <T> Page<T>	buildPage(SessionData sessionData, java.util.List<T> list, QueryParameters params) Builds a page from an in-memory list
static com.querydsl.core.types.Expression<java.lang.Double>	days(com.querydsl.core.types.Path<TimeInterval> path) Returns an expression which represents the number of days on this interval
static <E extends java.lang.Enum<E>> com.querydsl.core.types.dsl.NumberExpression<java.lang.Integer>	enumOrdinal(com.querydsl.core.types.dsl.EnumPath<E> path) Returns an expression that maps each enum value to its ordinal
static com.querydsl.core.types.OrderSpecifier<?>	orderSpecifier(com.querydsl.core.types.EntityPath<?> path) Returns an ascending order specifier suitable for the given entity path.
static com.querydsl.core.types.OrderSpecifier<?>	orderSpecifier(com.querydsl.core.types.EntityPath<?> path, boolean asc) Returns an order specifier suitable for the given entity path.
static <RT,Q extends com.querydsl.jpa.JPAQueryBase<?,Q>> Page<RT>	page(Q query, SessionData sessionData, java.lang.Integer _currentPage, java.lang.Integer _pageSize, com.querydsl.core.types.Expression<RT> expr) Returns a result page for the given query and page parameters, using the given expression for projection
static <RT,Q extends com.querydsl.jpa.JPAQueryBase<?,Q>> Page<RT>	page(Q query, SessionData sessionData, QueryParameters queryParameters, com.querydsl.core.types.Expression<RT> expr) Returns a result page for the given query and page parameters, using the given expression for projection
static <T> com.querydsl.core.types.dsl.PathBuilder<T>	pathBuilder(java.lang.Class<T> clazz) Returns a path builder for the given entity class
static <T> long	processBatch(BaseEntityManagerHandler entityManagerHandler, com.mysema.commons.lang.CloseableIterator<T> iterator, org.apache.commons.collections15.Closure<T> closure) Processes the given iterator, by using a CacheFlusher, and invoking the given closure for each iterator element.
static boolean	useParameter(java.lang.Object value) Returns whether the parameter should be used to filter the query or not.

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryHelper

public QueryHelper()

Method Detail

buildPage

public static <T> Page<T> buildPage(SessionData sessionData,
                                    java.util.List<T> list,
                                    java.lang.Integer _currentPage,
                                    java.lang.Integer _pageSize)

Builds a page from an in-memory list

buildPage

public static <T> Page<T> buildPage(SessionData sessionData,
                                    java.util.List<T> list,
                                    QueryParameters params)

Builds a page from an in-memory list

days

public static com.querydsl.core.types.Expression<java.lang.Double> days(com.querydsl.core.types.Path<TimeInterval> path)

Returns an expression which represents the number of days on this interval

enumOrdinal

public static <E extends java.lang.Enum<E>> com.querydsl.core.types.dsl.NumberExpression<java.lang.Integer> enumOrdinal(com.querydsl.core.types.dsl.EnumPath<E> path)

Returns an expression that maps each enum value to its ordinal

orderSpecifier

public static com.querydsl.core.types.OrderSpecifier<?> orderSpecifier(com.querydsl.core.types.EntityPath<?> path)

Returns an ascending order specifier suitable for the given entity path. The attempted properties are .

orderSpecifier

public static com.querydsl.core.types.OrderSpecifier<?> orderSpecifier(com.querydsl.core.types.EntityPath<?> path,
                                                                       boolean asc)

Returns an order specifier suitable for the given entity path. The attempted properties are .

page

public static <RT,Q extends com.querydsl.jpa.JPAQueryBase<?,Q>> Page<RT> page(Q query,
                                                                              SessionData sessionData,
                                                                              java.lang.Integer _currentPage,
                                                                              java.lang.Integer _pageSize,
                                                                              com.querydsl.core.types.Expression<RT> expr)

Returns a result page for the given query and page parameters, using the given expression for projection

page

public static <RT,Q extends com.querydsl.jpa.JPAQueryBase<?,Q>> Page<RT> page(Q query,
                                                                              SessionData sessionData,
                                                                              QueryParameters queryParameters,
                                                                              com.querydsl.core.types.Expression<RT> expr)

Returns a result page for the given query and page parameters, using the given expression for projection

pathBuilder

public static <T> com.querydsl.core.types.dsl.PathBuilder<T> pathBuilder(java.lang.Class<T> clazz)

Returns a path builder for the given entity class

processBatch

public static <T> long processBatch(BaseEntityManagerHandler entityManagerHandler,
                                    com.mysema.commons.lang.CloseableIterator<T> iterator,
                                    org.apache.commons.collections15.Closure<T> closure)

Processes the given iterator, by using a CacheFlusher, and invoking the given closure for each iterator element. The CloseableIterator.close() method is guaranteed to be invoked

useParameter

public static boolean useParameter(java.lang.Object value)

Returns whether the parameter should be used to filter the query or not. If the value is "empty" the query must not add a filter with the specified value.