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CriteriaQueryImpl.java
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CriteriaQueryImpl.java
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/**
* Copyright (C) 2020 Czech Technical University in Prague
*
* This program is free software: you can redistribute it and/or modify it under
* the terms of the GNU General Public License as published by the Free Software
* Foundation, either version 3 of the License, or (at your option) any
* later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details. You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cz.cvut.kbss.jopa.model;
import cz.cvut.kbss.jopa.model.metamodel.EntityType;
import cz.cvut.kbss.jopa.model.metamodel.Metamodel;
import cz.cvut.kbss.jopa.model.query.criteria.*;
import cz.cvut.kbss.jopa.query.criteria.*;
import cz.cvut.kbss.jopa.query.criteria.expressions.AbstractExpression;
import cz.cvut.kbss.jopa.utils.ErrorUtils;
import java.util.*;
public class CriteriaQueryImpl<T> implements CriteriaQuery<T> {
protected final CriteriaQueryHolder<T> query;
private final Metamodel metamodel;
private final CriteriaBuilderImpl cb;
public CriteriaQueryImpl(CriteriaQueryHolder<T> query, Metamodel metamodel, CriteriaBuilderImpl cb) {
this.query = Objects.requireNonNull(query, ErrorUtils.getNPXMessageSupplier("query"));
this.metamodel = metamodel;
this.cb = cb;
}
@Override
public <X> Root<X> from(Class<X> entityClass) {
RootImpl<X> root = new RootImpl<>(metamodel, null, entityClass, this.cb);
query.setRoot(root);
return root;
}
@Override
public <X> Root<X> from(EntityType<X> entity) {
RootImpl<X> root = new RootImpl<>(metamodel, null, entity.getBindableJavaType(), this.cb);
query.setRoot(root);
return root;
}
@Override
public CriteriaQuery<T> select(Selection<? extends T> selection) {
query.setSelection(selection);
return this;
}
@Override
public CriteriaQuery<T> where(Expression<Boolean> expression) {
query.setWhere(cb.wrapExpressionToPredicateWithRepair(expression));
return this;
}
@Override
public CriteriaQuery<T> where(Predicate... predicates) {
query.setWhere(cb.and(predicates));
return this;
}
@Override
public Class<T> getResultType() {
return query.getResultType();
}
@Override
public CriteriaQuery<T> distinct(boolean b) {
query.setDistinct(b);
return this;
}
@Override
public boolean isDistinct() {
return query.isDistinct();
}
@Override
public Selection<T> getSelection() {
return (Selection<T>) query.getSelection();
}
@Override
public Predicate getRestriction() {
return query.getWhere();
}
@Override
public CriteriaQuery<T> orderBy(List<Order> o) {
if (!o.isEmpty()) query.setOrderBy(o);
else query.setOrderBy(null);
return this;
}
@Override
public CriteriaQuery<T> orderBy(Order... o) {
if (o != null && o.length > 0) query.setOrderBy(Arrays.asList(o));
else query.setOrderBy(null);
return this;
}
@Override
public List<Order> getOrderList() {
if (query.getOrderBy() == null) return Collections.emptyList();
return new ArrayList<>(query.getOrderBy());
}
@Override
public CriteriaQuery<T> groupBy(Expression<?>... grouping) {
if (grouping != null && grouping.length > 0) query.setGroupBy(Arrays.asList(grouping));
else query.setGroupBy(null);
return this;
}
@Override
public CriteriaQuery<T> groupBy(List<Expression<?>> grouping) {
if (!grouping.isEmpty()) query.setGroupBy(grouping);
else query.setGroupBy(null);
return this;
}
@Override
public CriteriaQuery<T> having(Expression<Boolean> restriction) {
query.setHaving(cb.and(cb.wrapExpressionToPredicateWithRepair(restriction)));
return this;
}
@Override
public CriteriaQuery<T> having(Predicate... restrictions) {
query.setHaving(cb.and(restrictions));
return this;
}
/**
* Method translates criteria query to SOQL query and returns its string representation.
* @param parameterFiller
* @return string representation of SOQL query
*/
public String translateQuery(CriteriaParameterFiller parameterFiller) {
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append("SELECT ");
if (isDistinct()) stringBuilder.append("DISTINCT ");
((AbstractExpression) query.getSelection()).setExpressionToQuery(stringBuilder, parameterFiller);
stringBuilder.append(" FROM " + ((RootImpl) query.getRoot()).getJavaType().getSimpleName() + " ");
((RootImpl) query.getRoot()).setExpressionToQuery(stringBuilder, parameterFiller);
if (query.getWhere() != null) {
stringBuilder.append(" WHERE ");
((AbstractPredicate) query.getWhere()).setExpressionToQuery(stringBuilder, parameterFiller);
}
if (query.getGroupBy() != null && !query.getGroupBy().isEmpty()) {
stringBuilder.append(" GROUP BY ");
for (Expression groupBy : query.getGroupBy()) {
((AbstractExpression) groupBy).setExpressionToQuery(stringBuilder, parameterFiller);
}
}
if (query.getHaving() != null) {
stringBuilder.append(" HAVING ");
((AbstractPredicate) query.getHaving()).setExpressionToQuery(stringBuilder, parameterFiller);
}
if (!getOrderList().isEmpty()) {
stringBuilder.append(" ORDER BY ");
List<Order> orders = getOrderList();
for (int i = 0; i < orders.size(); i++) {
((AbstractExpression) orders.get(i).getExpression()).setExpressionToQuery(stringBuilder, parameterFiller);
stringBuilder.append(orders.get(i).isAscending() ? " ASC" : " DESC");
if (orders.size() > 1 && (i + 1) != orders.size()) stringBuilder.append(", ");
}
}
return stringBuilder.toString();
}
}