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;
  
  import static org.activiti.cloud.services.query.rest.RestDocConstants.PREDICATE_DESC;
  import static org.activiti.cloud.services.query.rest.RestDocConstants.PREDICATE_EXAMPLE;
  
  import com.querydsl.core.BooleanBuilder;
  import com.querydsl.core.types.Predicate;
  import com.querydsl.core.types.dsl.BooleanExpression;
  import io.swagger.v3.oas.annotations.Parameter;
  import java.util.Optional;
  import org.activiti.cloud.alfresco.data.domain.AlfrescoPagedModelAssembler;
  import org.activiti.cloud.api.model.shared.QueryCloudVariableInstance;
  import org.activiti.cloud.services.query.app.repository.VariableRepository;
  import org.activiti.cloud.services.query.model.ProcessVariableEntity;
  import org.activiti.cloud.services.query.model.QProcessVariableEntity;
  import org.activiti.cloud.services.query.rest.assembler.QueryCloudVariableInstanceRepresentationModelAssembler;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.data.domain.Page;
  import org.springframework.data.domain.Pageable;
  import org.springframework.data.querydsl.binding.QuerydslPredicate;
  import org.springframework.hateoas.EntityModel;
  import org.springframework.hateoas.MediaTypes;
  import org.springframework.hateoas.PagedModel;
  import org.springframework.http.MediaType;
  import org.springframework.web.bind.annotation.PathVariable;
  import org.springframework.web.bind.annotation.RequestMapping;
  import org.springframework.web.bind.annotation.RequestMethod;
  import org.springframework.web.bind.annotation.RestController;
  
  @RestController
  @RequestMapping(
      value = "/v1/process-instances/{processInstanceId}",
      produces = { MediaTypes.HAL_JSON_VALUE, MediaType.APPLICATION_JSON_VALUE }
  )
  public class ProcessInstanceVariableController {
  
      private final VariableRepository variableRepository;
  
      private final QueryCloudVariableInstanceRepresentationModelAssembler variableRepresentationModelAssembler;
  
      private final AlfrescoPagedModelAssembler<ProcessVariableEntity> pagedCollectionModelAssembler;
  
      @Autowired
      public ProcessInstanceVariableController(
          QueryCloudVariableInstanceRepresentationModelAssembler variableRepresentationModelAssembler,
          VariableRepository variableRepository,
          AlfrescoPagedModelAssembler<ProcessVariableEntity> pagedCollectionModelAssembler
      ) {
          this.variableRepository = variableRepository;
          this.variableRepresentationModelAssembler = variableRepresentationModelAssembler;
          this.pagedCollectionModelAssembler = pagedCollectionModelAssembler;
      }
  
      @RequestMapping(value = "/variables", method = RequestMethod.GET)
      public PagedModel<EntityModel<QueryCloudVariableInstance>> getVariablesProcess(
          @PathVariable String processInstanceId,
          @Parameter(description = PREDICATE_DESC, example = PREDICATE_EXAMPLE) @QuerydslPredicate(
              root = ProcessVariableEntity.class
          ) Predicate predicate,
          Pageable pageable
      ) {
          predicate = Optional.ofNullable(predicate).orElseGet(BooleanBuilder::new);
  
          QProcessVariableEntity variable = QProcessVariableEntity.processVariableEntity;
  
          //We will show only not deleted variables
          BooleanExpression expression = variable.processInstanceId.eq(processInstanceId);
  
          if (predicate != null) {
              expression = expression.and(predicate);
          }
  
          Predicate extendedPredicate = expression;
  
          Page<ProcessVariableEntity> variables = variableRepository.findAll(extendedPredicate, pageable);
  
          return pagedCollectionModelAssembler.toModel(pageable, variables, variableRepresentationModelAssembler);
      }
  }
  