OrderCallback.java
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/*
* Copyright Codecrew Ry
*
* All rights reserved.
*
* This license applies to any software containing a notice placed by the
* copyright holder. Such software is herein referred to as the Software.
* This license covers modification, distribution and use of the Software.
*
* Any distribution and use in source and binary forms, with or without
* modification is not permitted without explicit written permission from the
* copyright owner.
*
* A non-exclusive royalty-free right is granted to the copyright owner of the
* Software to use, modify and distribute all modifications to the Software in
* future versions of the Software.
*
*/
package fi.codecrew.moya.facade.callbacks;
import java.util.List;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Expression;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.SingularAttribute;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import fi.codecrew.moya.utilities.jpa.FacadeCallback;
import fi.codecrew.moya.utilities.jpa.ModelInterface;
public class OrderCallback<T extends ModelInterface> implements FacadeCallback<T> {
private final SingularAttribute<? super T, ?> sort;
private final boolean asc;
private String sortstr;
private static final Logger logger = LoggerFactory.getLogger(OrderCallback.class);
public OrderCallback(boolean asc, SingularAttribute<? super T, ?> sortAttr) {
sort = sortAttr;
this.asc = asc;
}
public OrderCallback(boolean asc2, String sort2) {
this.asc = asc2;
sortstr = sort2;
sort = null;
}
@Override
public void exec(CriteriaBuilder cb, CriteriaQuery<?> cq, Path<T> root, List<Predicate> predicates) {
Class<?> rettype = cq.getResultType();
// Check if returntype is entity or are we for example counting results
if (!ModelInterface.class.isAssignableFrom(rettype)) {
return;
}
Expression<?> path = null;
if (sort == null) {
if (sortstr == null) {
return;
}
try {
path = root.get(sortstr);
} catch (IllegalArgumentException e) {
path = null;
}
} else {
path = root.get(sort);
}
if (path == null) {
return;
}
if (path.getJavaType().equals(String.class)) {
path = cb.lower((Expression<String>) path);
}
if (asc) {
cq.orderBy(cb.asc(path));
} else {
cq.orderBy(cb.desc(path));
}
}
}