Subversion Repositories general

package ak.photoalbum.webapp;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.struts.action.ActionMapping;

import org.apache.struts.action.ActionForm;

import org.apache.struts.action.ActionForward;

import org.apache.log4j.Logger;

import ak.photoalbum.logic.Logic;

import ak.photoalbum.util.TimestampRecipient;

public final class ImageAction

  extends BaseAction

{

  private static final Logger logger = Logger.getLogger(ImageAction.class);

  public ActionForward executeAction(ActionMapping mapping, ActionForm form,

     HttpServletRequest request, HttpServletResponse response)

    throws Exception

  {

    PathForm               theForm            = (PathForm)form;

    String                 branch             = theForm.getBranch();

    String                 path               = theForm.getPath();

    Logic                  logic              = Logic.getLogic();

    HttpTimestampRecipient timestampRecipient = new HttpTimestampRecipient(response);

    long                   ifModifiedSince;

    boolean                fileModified       = true;

    try {

      ifModifiedSince = request.getDateHeader("If-Modified-Since");

    }

    catch(Exception ex) {

      ifModifiedSince = -1;

    }

    logger.info("get image " + mapping.getParameter() + " for " + path);

    if("dir".equals(mapping.getParameter())) {

      response.setContentType(logic.getThumbnailMime(branch));

      fileModified = logic.writeDir(branch, path, ifModifiedSince,

        response.getOutputStream(), timestampRecipient);

    }

    else if("small".equals(mapping.getParameter())) {

      response.setContentType(logic.getThumbnailMime(branch));

      fileModified = logic.writeSmall(branch, path, ifModifiedSince,

        response.getOutputStream(), timestampRecipient);

    }

    else if("medium".equals(mapping.getParameter())) {

      response.setContentType(logic.getThumbnailMime(branch));

      fileModified = logic.writeMedium(branch, path, ifModifiedSince,

        response.getOutputStream(), timestampRecipient);

    }

    else if("origin".equals(mapping.getParameter())) {

      response.setContentType(logic.getOriginMime(branch, path));

      fileModified = logic.writeOrigin(branch, path, ifModifiedSince,

        response.getOutputStream(), timestampRecipient);

    }

    // if file was modified comapring to "If-Modified-Since" header, then it's already written

    // into to response; otherwise send 304 code

    if(!fileModified) {

      response.setStatus(HttpServletResponse.SC_NOT_MODIFIED);

    }

    return null;

  }

  private class HttpTimestampRecipient

    implements TimestampRecipient

  {

    private final HttpServletResponse response;

    public HttpTimestampRecipient(HttpServletResponse response)

    {

      this.response = response;

    }

    public void setTimestamp(long timestamp)

    {

      response.setDateHeader("Last-Modified", timestamp);

    }

  }

}