PathStringSearchPredicateCreator.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.Collections;
import java.util.List;
import javax.persistence.criteria.CriteriaBuilder;
import javax.persistence.criteria.CriteriaQuery;
import javax.persistence.criteria.Path;
import javax.persistence.criteria.Predicate;
import javax.persistence.metamodel.SingularAttribute;
import fi.codecrew.moya.utilities.jpa.FacadeCallback;
import fi.codecrew.moya.utilities.jpa.ModelInterface;
public abstract class PathStringSearchPredicateCreator<T extends ModelInterface, D extends ModelInterface> implements FacadeCallback<T> {
private static final String WILDCARD = "%";
private String searchstr = null;
private List<SingularAttribute<D, String>> attributes = null;
public PathStringSearchPredicateCreator(String search, List<SingularAttribute<D, String>> attrs) {
if (addSearch(search)) {
attributes = attrs;
}
}
public PathStringSearchPredicateCreator(String search, SingularAttribute<D, String> from) {
if (addSearch(search)) {
attributes = Collections.singletonList(from);
}
}
private boolean addSearch(String search) {
if (search != null) {
search = search.trim().toLowerCase();
if (!search.isEmpty()) {
searchstr = new StringBuilder().append(WILDCARD).append(search).append(WILDCARD).toString();
return true;
}
}
searchstr = null;
return false;
}
@Override
public void exec(CriteriaBuilder cb, CriteriaQuery<?> cq, Path<T> path, List<Predicate> predicates) {
if (searchstr == null || attributes == null || attributes.isEmpty()) {
return;
}
Path<D> entityPath = getPath(path);
for (String splitSearch : searchstr.split(" "))
{
splitSearch = splitSearch.trim();
if (splitSearch.isEmpty())
continue;
splitSearch = new StringBuilder().append(WILDCARD).append(splitSearch).append(WILDCARD).toString();
Predicate[] preds = new Predicate[attributes.size()];
int i = 0;
for (SingularAttribute<D, String> attr : attributes) {
preds[i++] = cb.like(cb.lower(entityPath.get(attr)), splitSearch);
}
predicates.add(cb.or(preds));
}
}
protected abstract Path<D> getPath(Path<T> root);
}