org.camunda.bpm.engine.impl.cmd.GetAttachmentContentCmd Maven / Gradle / Ivy
/*
* 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.ByteArrayInputStream;
import java.io.InputStream;
import java.io.Serializable;
import org.camunda.bpm.engine.impl.db.entitymanager.DbEntityManager;
import org.camunda.bpm.engine.impl.interceptor.Command;
import org.camunda.bpm.engine.impl.interceptor.CommandContext;
import org.camunda.bpm.engine.impl.persistence.entity.AttachmentEntity;
import org.camunda.bpm.engine.impl.persistence.entity.ByteArrayEntity;
/**
* @author Tom Baeyens
*/
public class GetAttachmentContentCmd implements Command, Serializable {
private static final long serialVersionUID = 1L;
protected String attachmentId;
public GetAttachmentContentCmd(String attachmentId) {
this.attachmentId = attachmentId;
}
public InputStream execute(CommandContext commandContext) {
DbEntityManager dbEntityManger = commandContext.getDbEntityManager();
AttachmentEntity attachment = dbEntityManger.selectById(AttachmentEntity.class, attachmentId);
String contentId = attachment.getContentId();
if (contentId==null) {
return null;
}
ByteArrayEntity byteArray = dbEntityManger.selectById(ByteArrayEntity.class, contentId);
byte[] bytes = byteArray.getBytes();
return new ByteArrayInputStream(bytes);
}
}