/* 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.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.deploy.DeploymentManager;
import org.activiti.engine.impl.persistence.deploy.ProcessDefinitionInfoCacheObject;

import com.fasterxml.jackson.databind.node.ObjectNode;


/**
 * @author Tijs Rademakers
 */
public class GetProcessDefinitionInfoCmd implements Command<ObjectNode>, Serializable {
  
  private static final long serialVersionUID = 1L;
  
  protected String processDefinitionId;
  
  public GetProcessDefinitionInfoCmd(String processDefinitionId) {
    this.processDefinitionId = processDefinitionId;
  }
  
  public ObjectNode execute(CommandContext commandContext) {
    if (processDefinitionId == null) {
      throw new ActivitiIllegalArgumentException("process definition id is null");
    }
    
    ObjectNode resultNode = null;
    DeploymentManager deploymentManager = commandContext.getProcessEngineConfiguration().getDeploymentManager();
    // make sure the process definition is in the cache
    deploymentManager.findDeployedProcessDefinitionById(processDefinitionId);
    ProcessDefinitionInfoCacheObject definitionInfoCacheObject = deploymentManager.getProcessDefinitionInfoCache().get(processDefinitionId);
    if (definitionInfoCacheObject != null) {
      resultNode = definitionInfoCacheObject.getInfoNode();
    }
    
    return resultNode;
  }

}