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/*
 * Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
 *
 * 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.querydsl.jpa;

import com.querydsl.core.JoinType;
import com.querydsl.core.QueryMetadata;
import com.querydsl.core.support.CollectionAnyVisitor;
import com.querydsl.core.support.Context;
import com.querydsl.core.types.EntityPath;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.ExpressionUtils;
import com.querydsl.core.types.Ops;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.PathMetadataFactory;
import com.querydsl.core.types.Predicate;
import com.querydsl.core.types.SubQueryExpressionImpl;
import com.querydsl.core.types.dsl.EntityPathBase;
import com.querydsl.core.types.dsl.Expressions;
import com.querydsl.core.types.dsl.SimplePath;
import jakarta.persistence.Entity;

/**
 * {@code JPACollectionAnyVisitor} extends the {@link CollectionAnyVisitor} class with module
 * specific extensions
 *
 * @author tiwe
 */
class JPACollectionAnyVisitor extends CollectionAnyVisitor {

  @SuppressWarnings("unchecked")
  @Override
  protected Predicate exists(Context c, Predicate condition) {
    JPAQueryMixin query = new JPAQueryMixin<>();
    query.setProjection(Expressions.ONE);
    for (var i = 0; i < c.paths.size(); i++) {
      Path child = c.paths.get(i).getMetadata().getParent();
      var replacement = (EntityPath) c.replacements.get(i);
      if (c.paths.get(i).getType().isAnnotationPresent(Entity.class)) {
        query.addJoin(
            i == 0 ? JoinType.DEFAULT : JoinType.INNERJOIN,
            Expressions.as(
                Expressions.listPath(
                    (Class) c.paths.get(i).getType(), SimplePath.class, child.getMetadata()),
                replacement));
      } else {
        // join via parent
        Path parent = child.getMetadata().getParent();
        var newParent =
            new EntityPathBase(
                parent.getType(),
                ExpressionUtils.createRootVariable(parent, Math.abs(condition.hashCode())));
        var newChild =
            new EntityPathBase(
                child.getType(),
                PathMetadataFactory.forProperty(newParent, child.getMetadata().getName()));
        query.from(newParent);
        query.addJoin(JoinType.INNERJOIN, Expressions.as(newChild, replacement));
        query.where(ExpressionUtils.eq(newParent, parent));
      }
    }
    c.clear();
    query.where(condition);
    return ExpressionUtils.predicate(Ops.EXISTS, asExpression(query.getMetadata()));
  }

  private Expression asExpression(QueryMetadata metadata) {
    return new SubQueryExpressionImpl(metadata.getProjection().getType(), metadata);
  }
}
    

    

    

            

    

            



    
    






    
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