org.jinq.jpa.jpqlquery.JPQLQuery Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of jinq-jpa Show documentation

Jinq functional-style queries for JPA

There is a newer version: 2.0.2

package org.jinq.jpa.jpqlquery;

import java.util.List;


/**
 * Data structure used to represent JPQL queries and the conversions
 * needed to parse results into a form usable by Jinq.
 */
public abstract class JPQLQuery implements JPQLFragment
{
   public static  JPQLQuery findAllEntities(String entityName)
   {
      SelectFromWhere query = new SelectFromWhere<>();
      From from = From.forEntity(entityName);
      query.cols = ColumnExpressions.singleColumn(
            new SimpleRowReader<>(), new FromAliasExpression(from));
      query.froms.add(from);
      return query;
   }
   
   public JPQLQuery()
   {
   }

   /**
    * @return true iff the query is a simple select...from...where style query
    */
   public abstract boolean isSelectFromWhere();
   public abstract boolean isSelectOnly();
   public abstract boolean isSelectFromWhereGroupHaving();
   public abstract boolean canSelectWhere();
   public abstract boolean canSelectHaving();
   public abstract boolean canAggregate();
   public abstract boolean canUnsortAggregate();
   public abstract boolean canSort();
   public abstract boolean canDistinct();
   public abstract boolean isValidSubquery();
 
   
   public abstract String getQueryString();
   public abstract List getQueryParameters();
   public abstract JPQLQuery shallowCopy();

   public abstract RowReader getRowReader();
   
   // TODO: If I code things carefully, maybe this method isn't needed.
//   public JPQLQuery copy()
//   {
//      JPQLQuery newQuery = new JPQLQuery<>();
//      newQuery.query = query;
//      return newQuery;
//   }
}