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package eu.dnetlib.openaire.dsm.dao;
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import java.util.List;
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import java.util.Map.Entry;
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import javax.persistence.criteria.*;
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import eu.dnetlib.enabling.datasources.common.DsmRuntimeException;
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import eu.dnetlib.openaire.dsm.domain.FilterName;
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import eu.dnetlib.openaire.dsm.domain.RequestFilter;
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import eu.dnetlib.openaire.dsm.domain.RequestSort;
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import eu.dnetlib.openaire.dsm.domain.RequestSortOrder;
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import eu.dnetlib.openaire.dsm.domain.db.DatasourceApiDbEntry;
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import eu.dnetlib.openaire.dsm.domain.db.DatasourceDbEntry;
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import org.apache.commons.lang3.BooleanUtils;
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import org.apache.commons.lang3.StringUtils;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.data.jpa.domain.Specification;
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public class DatasourceSpecs {
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private static final Log log = LogFactory.getLog(DatasourceSpecs.class);
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public static final String WILDCARD = "%";
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public static Specification<DatasourceDbEntry> dsSpec(final RequestSort requestSortBy, final RequestSortOrder order, final RequestFilter requestFilter) {
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log.debug(String.format("RequestFilter:'%s', RequestSort:'%s', RequestSortOrder:'%s'", requestFilter, requestSortBy, order));
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return (ds, query, cb) -> {
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final Predicate p = cb.conjunction();
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if (requestFilter != null) {
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final List<Expression<Boolean>> expressions = p.getExpressions();
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requestFilter.entrySet().stream()
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.forEach(e -> {
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switch (FilterName.type(e.getKey())) {
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case exact:
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expressions.add(exactSearch(ds, cb, e));
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break;
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case search:
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expressions.add(likeSearch(ds, cb, e));
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break;
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case searchOrgs:
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// search by case insensitive organization's country
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expressions.add(
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cb.equal(
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cb.lower(
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ds.join("organizations").get(FilterName.country.name())),
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getValue(e)));
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break;
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}
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});
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}
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if (requestSortBy != null) {
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if (order != null) {
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final Path<Object> orderField = ds.get(requestSortBy.name());
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switch (order) {
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case ASCENDING:
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query.orderBy(cb.asc(orderField));
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break;
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case DESCENDING:
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query.orderBy(cb.desc(orderField));
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break;
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}
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}
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}
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query.distinct(true);
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return p;
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};
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}
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public static Specification<DatasourceApiDbEntry> apiSpec(final RequestFilter requestFilter) {
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log.debug(String.format("RequestFilter:'%s'", requestFilter));
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return (api, query, cb) -> {
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final Predicate p = cb.conjunction();
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if (requestFilter != null) {
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final List<Expression<Boolean>> expressions = p.getExpressions();
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requestFilter.entrySet().stream()
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.forEach(e -> {
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switch (FilterName.type(e.getKey())) {
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case exact:
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expressions.add(exactSearch(api, cb, e));
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break;
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case search:
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expressions.add(likeSearch(api, cb, e));
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break;
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case searchOrgs:
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throw new DsmRuntimeException("not implemented");
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}
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});
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}
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query.distinct(true);
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return p;
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};
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}
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// HELPERS
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// substring, case insensitive, like based search
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private static Predicate likeSearch(final Root<?> r, final CriteriaBuilder cb, final Entry<FilterName, Object> e) {
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return cb.like(
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cb.lower(
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r.get(e.getKey().name())),
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WILDCARD + getValue(e) + WILDCARD);
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}
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// search by ID, managed. exact match
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private static Predicate exactSearch(final Root<?> r, final CriteriaBuilder cb, final Entry<FilterName, Object> e) {
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return cb.equal(r.get(e.getKey().name()), getValue(e));
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}
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private static Object getValue(final Entry<FilterName, Object> e) {
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if (e.getValue() instanceof String) {
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final String s = ((String) e.getValue());
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if (!e.getKey().equals(FilterName.country)) {
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Boolean b = BooleanUtils.toBooleanObject(s);
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if (b != null) {
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return b;
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}
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}
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return e.getKey().equals(FilterName.id) ? s : StringUtils.lowerCase(s);
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}
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if (e.getValue() instanceof Boolean) {
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return e.getValue();
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}
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return e.getValue();
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}
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}
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