/* 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.engine.impl.cmd;
import java.io.InputStream;
import java.io.Serializable;
import org.activiti.engine.ActivitiIllegalArgumentException;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 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<InputStream>, Serializable {
private static final long serialVersionUID = 1L;
private static Logger log = LoggerFactory.getLogger(GetDeploymentProcessDiagramCmd.class);
protected String processDefinitionId;
public GetDeploymentProcessDiagramCmd(String processDefinitionId) {
if (processDefinitionId == null || processDefinitionId.length() < 1) {
throw new ActivitiIllegalArgumentException("The process definition id is mandatory, but '" + processDefinitionId + "' has been provided.");
}
this.processDefinitionId = processDefinitionId;
}
public InputStream execute(CommandContext commandContext) {
ProcessDefinitionEntity processDefinition = commandContext
.getProcessEngineConfiguration()
.getDeploymentManager()
.findDeployedProcessDefinitionById(processDefinitionId);
String deploymentId = processDefinition.getDeploymentId();
String resourceName = processDefinition.getDiagramResourceName();
if (resourceName == null ) {
log.info("Resource name is null! No process diagram stream exists.");
return null;
} else {
InputStream processDiagramStream =
new GetDeploymentResourceCmd(deploymentId, resourceName)
.execute(commandContext);
return processDiagramStream;
}
}
}