org.opensingular.requirement.module.persistence.query.RequirementSearchQuery Maven / Gradle / Ivy

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/*
 * Copyright (C) 2016 Singular Studios (a.k.a Atom Tecnologia) - www.opensingular.com
 *
 * 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 org.opensingular.requirement.module.persistence.query;

import com.querydsl.core.BooleanBuilder;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.OrderSpecifier;
import com.querydsl.core.types.Predicate;
import com.querydsl.core.types.dsl.CaseBuilder;
import com.querydsl.jpa.impl.JPAQuery;
import org.hibernate.Session;
import org.hibernate.query.Query;
import org.hibernate.transform.AliasToEntityMapResultTransformer;
import org.opensingular.lib.commons.lambda.IFunction;
import org.opensingular.requirement.module.persistence.filter.FilterToken;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.function.Function;

public class RequirementSearchQuery extends JPAQuery> {
    private final List>                selects               = new ArrayList<>();
    private final List> quickFilterConditions = new ArrayList<>();

    public RequirementSearchQuery(Session session) {
        super(session);
    }

    public RequirementSearchQuery addToSelect(Expression exp) {
        selects.add(exp);
        return this;
    }

    public RequirementSearchQuery addCaseToSelect(Function> caseExp) {
        selects.add(caseExp.apply(new CaseBuilder()));
        return this;
    }

    public RequirementSearchQuery addConditionToQuickFilter(IFunction conditionProvider) {
        quickFilterConditions.add(conditionProvider);
        return this;
    }

    public RequirementSearchQuery setDefaultOrder(OrderSpecifier orderSpecifier){
        getMetadata().clearOrderBy();
        orderBy(orderSpecifier);
        return this;
    }

    @SuppressWarnings("unchecked")
    public List> fetchMap() {
        return select(selects.toArray(new Expression[]{}))
                .createQuery()
                .unwrap(Query.class)
                .setResultTransformer(AliasToEntityMapResultTransformer.INSTANCE)
                .list();
    }

    public void applyQuickFilter(List tokens) {
        BooleanBuilder filterBooleanBuilder = new BooleanBuilder();
        for (FilterToken token : tokens) {
            BooleanBuilder tokenBooleanBuilder = new BooleanBuilder();
            for (String filter : token.getAllPossibleMatches()) {
                BooleanBuilder tokenExpression = new BooleanBuilder();
                quickFilterConditions.stream().map(i -> i.apply(filter)).forEach(tokenExpression::or);
                tokenBooleanBuilder.or(tokenExpression);
            }
            filterBooleanBuilder.and(tokenBooleanBuilder);
        }
        where(filterBooleanBuilder);
    }

}