package org.argeo.slc.client.rap;
   
   import java.io.IOException;
   import java.io.InputStream;
   
   import javax.jcr.Node;
   import javax.jcr.Property;
   import javax.jcr.RepositoryException;
   import javax.jcr.Session;
  import javax.jcr.nodetype.NodeType;
  import javax.servlet.ServletException;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.commons.io.IOUtils;
  import org.argeo.jcr.JcrUtils;
  import org.argeo.slc.SlcException;
  //import org.eclipse.rap.rwt.service.IServiceHandler;
  
  /**
   * Basic Default service handler that retrieves a file from a NT_FILE JCR node
   * and launch the download.
   */
  public class OpenJcrFileService {//implements IServiceHandler {
  
  	/* DEPENDENCY INJECTION */
  	final private Node fileNode;
  
  	public OpenJcrFileService(Node fileNode) {
  		this.fileNode = fileNode;
  	}
  
  	public void service(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException {
  		// Get the file content
  		byte[] download = getFileAsByteArray();
  
  		// Send the file in the response
  		//HttpServletResponse response = RWT.getResponse();
  		response.setContentType("application/octet-stream");
  		response.setContentLength(download.length);
  		String contentDisposition = null;
  		try {
  			contentDisposition = "attachment; filename=\""
  					+ JcrUtils.lastPathElement(fileNode.getPath()) + "\"";
  		} catch (RepositoryException e) {
  			throw new SlcException("Error while getting file Path " + fileNode,
  					e);
  		}
  		response.setHeader("Content-Disposition", contentDisposition);
  
  		try {
  			response.getOutputStream().write(download);
  		} catch (IOException ioe) {
  			throw new SlcException("Error while writing the file " + fileNode
  					+ " to the servlet response", ioe);
  		}
  	}
  
  	protected byte[] getFileAsByteArray() {
  
  		Session businessSession = null;
  		try {
  			boolean isValid = true;
  			Node child = null;
  			if (!fileNode.isNodeType(NodeType.NT_FILE))
  				isValid = false;
  			else {
  				child = fileNode.getNode(Property.JCR_CONTENT);
  				if (!(child.isNodeType(NodeType.NT_RESOURCE) || child
  						.hasProperty(Property.JCR_DATA)))
  					isValid = false;
  			}
  
  			if (!isValid)
  				return null;
  
  			byte[] ba = null;
  			InputStream fis = null;
  			try {
  				fis = (InputStream) child.getProperty(Property.JCR_DATA)
  						.getBinary().getStream();
  				ba = IOUtils.toByteArray(fis);
  			} catch (Exception e) {
  				throw new SlcException("Stream error while opening file "
  						+ fileNode, e);
  			} finally {
  				IOUtils.closeQuietly(fis);
  			}
  			return ba;
  
  		} catch (RepositoryException e) {
  			throw new SlcException("Unexpected error while "
  					+ "opening file node " + fileNode, e);
  		} finally {
  			JcrUtils.logoutQuietly(businessSession);
  		}
  	}
  }