com.blazebit.persistence.impl.CriteriaBuilderImpl Maven / Gradle / Ivy

/*
 * Copyright 2014 - 2020 Blazebit.
 *
 * 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
 *
 *      http://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 com.blazebit.persistence.impl;

import com.blazebit.persistence.CriteriaBuilder;
import com.blazebit.persistence.LeafOngoingFinalSetOperationCriteriaBuilder;
import com.blazebit.persistence.LeafOngoingSetOperationCriteriaBuilder;
import com.blazebit.persistence.ObjectBuilder;
import com.blazebit.persistence.SelectObjectBuilder;
import com.blazebit.persistence.StartOngoingSetOperationCriteriaBuilder;
import com.blazebit.persistence.spi.SetOperationType;

import javax.persistence.TypedQuery;

/**
 *
 * @param  The query result type
 * @author Christian Beikov
 * @author Moritz Becker
 * @since 1.0.0
 */
public class CriteriaBuilderImpl extends AbstractFullQueryBuilder, LeafOngoingSetOperationCriteriaBuilder, StartOngoingSetOperationCriteriaBuilder>, BaseFinalSetOperationCriteriaBuilderImpl> implements CriteriaBuilder {

    protected long cachedQueryRootMaximumCount;
    protected String cachedQueryRootCountQueryString;
    protected String cachedExternalQueryRootCountQueryString;

    public CriteriaBuilderImpl(MainQuery mainQuery, boolean isMainQuery, Class clazz, String alias) {
        super(mainQuery, isMainQuery, clazz, alias, null);
    }

    @Override
    protected void prepareForModification(ClauseType changedClause) {
        super.prepareForModification(changedClause);
        cachedQueryRootMaximumCount = Long.MAX_VALUE;
        cachedQueryRootCountQueryString = null;
        cachedExternalQueryRootCountQueryString = null;
    }

    @Override
    public TypedQuery getQueryRootCountQuery() {
        if (!havingManager.isEmpty()) {
            throw new IllegalStateException("Cannot count a HAVING query yet!");
        }
        prepareAndCheck();
        return getCountQuery(getCountQueryRootQueryStringWithoutCheck(Long.MAX_VALUE));
    }

    @Override
    public TypedQuery getQueryRootCountQuery(long maximumCount) {
        if (!havingManager.isEmpty()) {
            throw new IllegalStateException("Cannot count a HAVING query yet!");
        }
        prepareAndCheck();
        return getCountQuery(getCountQueryRootQueryStringWithoutCheck(maximumCount));
    }

    @Override
    public String getQueryRootCountQueryString() {
        prepareAndCheck();
        return getExternalQueryRootCountQueryString(Long.MAX_VALUE);
    }

    @Override
    public String getQueryRootCountQueryString(long maximumCount) {
        prepareAndCheck();
        return getExternalQueryRootCountQueryString(maximumCount);
    }

    private String getCountQueryRootQueryStringWithoutCheck(long maximumCount) {
        if (cachedQueryRootMaximumCount != maximumCount) {
            cachedQueryRootMaximumCount = maximumCount;
            cachedQueryRootCountQueryString = null;
            cachedExternalQueryRootCountQueryString = null;
        }
        if (cachedQueryRootCountQueryString == null) {
            cachedQueryRootCountQueryString = buildPageCountQueryString(false, false, cachedQueryRootMaximumCount);
        }

        return cachedQueryRootCountQueryString;
    }

    private String getExternalQueryRootCountQueryString(long maximumCount) {
        if (cachedQueryRootMaximumCount != maximumCount) {
            cachedQueryRootMaximumCount = maximumCount;
            cachedQueryRootCountQueryString = null;
            cachedExternalQueryRootCountQueryString = null;
        }
        if (cachedExternalQueryRootCountQueryString == null) {
            cachedExternalQueryRootCountQueryString = buildPageCountQueryString(true, false, cachedQueryRootMaximumCount);
        }

        return cachedExternalQueryRootCountQueryString;
    }

    @Override
    public  CriteriaBuilder copy(Class resultClass) {
        return (CriteriaBuilder) super.copy(resultClass);
    }

    @Override
    @SuppressWarnings("unchecked")
    public  SelectObjectBuilder> selectNew(Class clazz) {
        return (SelectObjectBuilder>) super.selectNew(clazz);
    }

    @Override
    @SuppressWarnings("unchecked")
    public  CriteriaBuilder selectNew(ObjectBuilder builder) {
        return (CriteriaBuilder) super.selectNew(builder);
    }

    @Override
    protected void verifySetBuilderEnded() {
        super.verifySetBuilderEnded();
        if (finalSetOperationBuilder != null) {
            throw new IllegalStateException("The original criteria builder should not be accessed anymore after connecting it with a set operation. Use the result of the set operation instead!");
        }
    }

    @Override
    protected BaseFinalSetOperationCriteriaBuilderImpl createFinalSetOperationBuilder(SetOperationType operator, boolean nested) {
        boolean wasMainQuery = isMainQuery;
        this.isMainQuery = false;
        BuilderListener