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    • io.micronaut.data.runtime.intercept.criteria.FindPageSpecificationInterceptor Maven / Gradle / Ivy

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    /*
 * Copyright 2017-2020 original authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.micronaut.data.runtime.intercept.criteria;

import io.micronaut.aop.MethodInvocationContext;
import io.micronaut.core.annotation.Internal;
import io.micronaut.core.util.CollectionUtils;
import io.micronaut.data.intercept.RepositoryMethodKey;
import io.micronaut.data.model.CursoredPage;
import io.micronaut.data.model.Page;
import io.micronaut.data.model.Pageable;
import io.micronaut.data.model.runtime.PreparedQuery;
import io.micronaut.data.operations.RepositoryOperations;
import io.micronaut.data.runtime.operations.internal.sql.DefaultSqlPreparedQuery;
import jakarta.persistence.Tuple;
import jakarta.persistence.criteria.CriteriaQuery;
import jakarta.persistence.criteria.Predicate;
import jakarta.persistence.criteria.Root;

import java.util.ArrayList;
import java.util.List;

/**
 * Runtime implementation of {@code Page find(Specification, Pageable)}.
 *
 * @author Denis Stepanov
 * @since 3.2
 */
@Internal
public class FindPageSpecificationInterceptor extends AbstractSpecificationInterceptor {

    /**
     * Default constructor.
     *
     * @param operations The operations
     */
    protected FindPageSpecificationInterceptor(RepositoryOperations operations) {
        super(operations);
    }

    @Override
    public Object intercept(RepositoryMethodKey methodKey, MethodInvocationContext context) {
        if (context.getParameterValues().length != 2) {
            throw new IllegalStateException("Expected exactly 2 arguments to method");
        }

        Pageable pageable = getPageable(context);
        CriteriaQuery criteriaQuery = buildQuery(methodKey, context);
        Root root = criteriaQuery.getRoots().iterator().next();
        Iterable iterable;
        if (root.getJoins().isEmpty()) {
            iterable = findAll(methodKey, context, pageable, criteriaQuery);
        } else {
            CriteriaQuery criteriaIdsQuery = buildIdsQuery(methodKey, context, pageable);
            List tupleResult = findAll(methodKey, context, pageable, criteriaIdsQuery);
            if (tupleResult.isEmpty()) {
                iterable = List.of();
            } else {
                List ids = new ArrayList<>(tupleResult.size());
                for (Tuple tuple : tupleResult) {
                    ids.add(tuple.get(0));
                }
                Predicate inPredicate = getIdExpression(root).in(ids);
                criteriaQuery.where(inPredicate);
                iterable = findAll(methodKey, context, pageable.withoutPaging(), criteriaQuery);
            }
        }

        List resultList = (List) CollectionUtils.iterableToList(iterable);
        Long count = null;
        if (pageable.requestTotal()) {
            CriteriaQuery query = buildCountQuery(methodKey, context);
            count = getCriteriaRepositoryOperations(methodKey, context, null).findOne(query);
        }

        Page page;
        if (pageable.getMode() == Pageable.Mode.OFFSET) {
            page = Page.of(resultList, pageable, count);
        } else {
            PreparedQuery preparedQuery = (PreparedQuery) context.getAttribute(PREPARED_QUERY_KEY).orElse(null);
            if (preparedQuery instanceof DefaultSqlPreparedQuery sqlPreparedQuery) {
                List cursors = sqlPreparedQuery.createCursors(resultList, pageable);
                page = CursoredPage.of(resultList, pageable, cursors, count);
            } else {
                throw new UnsupportedOperationException("Only offset pageable mode is supported by this query implementation");
            }
        }
        Class rt = context.getReturnType().getType();
        if (rt.isInstance(page)) {
            return page;
        }
        return operations.getConversionService().convert(page, rt)
            .orElseThrow(() -> new IllegalStateException("Unsupported page interface type " + rt));
    }

}
    
    
    
    

    




    
    
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