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Zeebe BPMN model API

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/*
 * Copyright © 2017 camunda services GmbH ([email protected])
 *
 * 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 io.camunda.zeebe.model.bpmn.validation.zeebe;

import io.camunda.zeebe.model.bpmn.instance.EventDefinition;
import io.camunda.zeebe.model.bpmn.instance.Message;
import io.camunda.zeebe.model.bpmn.instance.MessageEventDefinition;
import io.camunda.zeebe.model.bpmn.instance.ReceiveTask;
import io.camunda.zeebe.model.bpmn.util.ModelUtil;
import java.util.List;
import java.util.stream.Stream;
import org.camunda.bpm.model.xml.validation.ModelElementValidator;
import org.camunda.bpm.model.xml.validation.ValidationResultCollector;

public class ReceiveTaskValidator implements ModelElementValidator {

  @Override
  public Class getElementType() {
    return ReceiveTask.class;
  }

  @Override
  public void validate(
      final ReceiveTask element, final ValidationResultCollector validationResultCollector) {
    final Message message = element.getMessage();
    if (message == null) {
      validationResultCollector.addError(0, "Must reference a message");
    }

    final List eventDefinitions =
        ModelUtil.getEventDefinitionsForBoundaryEvents(element);

    final Stream messageNames =
        ModelUtil.getEventDefinition(eventDefinitions, MessageEventDefinition.class)
            .map(MessageEventDefinition::getMessage)
            .filter(m -> m.getName() != null && !m.getName().isEmpty())
            .map(Message::getName);

    final boolean hasDuplicateMessageName =
        messageNames.anyMatch(name -> name.equals(message.getName()));

    if (hasDuplicateMessageName) {
      validationResultCollector.addError(
          0, "Cannot reference the same message name as a boundary event");
    }
  }
}