org.camunda.bpm.engine.impl.cmd.GetDeploymentProcessDiagramCmd Maven / Gradle / Ivy

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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.cmd;

import java.io.InputStream;
import java.io.Serializable;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.impl.cfg.CommandChecker;
import org.camunda.bpm.engine.impl.context.Context;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.ProcessDefinitionEntity;


/**
 * Gives access to a deployed process diagram, e.g., a PNG image, through a
 * stream of bytes.
 *
 * @author Falko Menge
 */
public class GetDeploymentProcessDiagramCmd implements Command, Serializable {

  private static final long serialVersionUID = 1L;

  protected String processDefinitionId;

  public GetDeploymentProcessDiagramCmd(String processDefinitionId) {
    if (processDefinitionId == null || processDefinitionId.length() < 1) {
      throw new ProcessEngineException("The process definition id is mandatory, but '" + processDefinitionId + "' has been provided.");
    }
    this.processDefinitionId = processDefinitionId;
  }

  public InputStream execute(final CommandContext commandContext) {
    ProcessDefinitionEntity processDefinition = Context
            .getProcessEngineConfiguration()
            .getDeploymentCache()
            .findDeployedProcessDefinitionById(processDefinitionId);

    for(CommandChecker checker : commandContext.getProcessEngineConfiguration().getCommandCheckers()) {
      checker.checkReadProcessDefinition(processDefinition);
    }

    final String deploymentId = processDefinition.getDeploymentId();
    final String resourceName = processDefinition.getDiagramResourceName();

    if (resourceName == null ) {
      return null;
    } else {

      InputStream processDiagramStream = commandContext.runWithoutAuthorization(
          new GetDeploymentResourceCmd(deploymentId, resourceName));

      return processDiagramStream;
    }
  }

}