content: /*
   * Copyright 2017-2025 Hyland Software, Inc. and its affiliates.
   *
   * 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.activiti.cloud.services.query.rest.specification;
  
  import jakarta.persistence.criteria.CriteriaBuilder;
  import jakarta.persistence.criteria.CriteriaQuery;
  import jakarta.persistence.criteria.Expression;
  import jakarta.persistence.criteria.Predicate;
  import jakarta.persistence.criteria.Root;
  import java.util.Set;
  import org.activiti.cloud.services.query.model.ProcessVariableEntity;
  import org.activiti.cloud.services.query.model.ProcessVariableEntity_;
  import org.activiti.cloud.services.query.model.ProcessVariableKey;
  import org.springframework.data.jpa.domain.Specification;
  
  public class ProcessVariableSpecification implements Specification<ProcessVariableEntity> {
  
      private final Set<String> processInstanceIds;
      private final Set<ProcessVariableKey> processVariableKeys;
  
      public ProcessVariableSpecification(Set<String> processInstanceIds, Set<ProcessVariableKey> processVariableKeys) {
          this.processInstanceIds = processInstanceIds;
          this.processVariableKeys = processVariableKeys;
      }
  
      @Override
      public Predicate toPredicate(
          Root<ProcessVariableEntity> root,
          CriteriaQuery<?> query,
          CriteriaBuilder criteriaBuilder
      ) {
          Predicate keyAndNameFilter = processVariableKeys
              .stream()
              .map(processVariableKey -> {
                  Expression<String> processVariableKeyExpression = root.get(ProcessVariableEntity_.processDefinitionKey);
                  Expression<String> processVariableValueExpression = root.get(ProcessVariableEntity_.name);
                  return criteriaBuilder.and(
                      criteriaBuilder.equal(processVariableKeyExpression, processVariableKey.processDefinitionKey()),
                      criteriaBuilder.equal(processVariableValueExpression, processVariableKey.variableName())
                  );
              })
              .reduce(criteriaBuilder::or)
              .orElse(criteriaBuilder.disjunction());
  
          return criteriaBuilder.and(
              root.get(ProcessVariableEntity_.processInstanceId).in(processInstanceIds),
              keyAndNameFilter
          );
      }
  }
  