[jboss-cvs] jboss-seam/src/ui/org/jboss/seam/ui/resource ...

[Peter Muir]

  User: pmuir   
  Date: 07/04/17 11:14:53

  Added:       src/ui/org/jboss/seam/ui/resource  StyleResource.java
  Log:
  Initial support for EL in CSS files
  
  Revision  Changes    Path
  1.1      date: 2007/04/17 15:14:53;  author: pmuir;  state: Exp;jboss-seam/src/ui/org/jboss/seam/ui/resource/StyleResource.java
  
  Index: StyleResource.java
  ===================================================================
  package org.jboss.seam.ui.resource;
  
  import static org.jboss.seam.InterceptionType.NEVER;
  import static org.jboss.seam.ScopeType.APPLICATION;
  import static org.jboss.seam.annotations.Install.BUILT_IN;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.InputStreamReader;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.jboss.seam.annotations.Install;
  import org.jboss.seam.annotations.Intercept;
  import org.jboss.seam.annotations.Name;
  import org.jboss.seam.annotations.Scope;
  import org.jboss.seam.annotations.Startup;
  import org.jboss.seam.contexts.Lifecycle;
  import org.jboss.seam.core.Expressions;
  import org.jboss.seam.core.Interpolator;
  import org.jboss.seam.servlet.AbstractResource;
  import org.jboss.seam.util.Resources;
  
  /**
   * Serve up stylesheets which are have been run through the EL
   * Interpolator.
   * @author pmuir
   *
   */
  
  @Startup
  @Scope(APPLICATION)
  @Name("org.jboss.seam.ui.resource.styleResource")
  @Install(precedence = BUILT_IN)
  @Intercept(NEVER)
  public class StyleResource extends AbstractResource
  {
     
     public static final String WEB_RESOURCE_PATH = "/seam/resource/style";
     
     private static final String RESOURCE_PATH = "/style";
  
     @Override
     public void getResource(HttpServletRequest request, HttpServletResponse response) throws IOException
     {
        String pathInfo = request.getPathInfo().substring(getResourcePath().length());
        
        InputStream in = Resources.getResourceAsStream(pathInfo);
        
        if (in != null)
        {
           try
           {
              Lifecycle.beginRequest( getServletContext(), request.getSession(), request );
              BufferedReader reader = new BufferedReader(new InputStreamReader(in));
              StringBuilder css = new StringBuilder();
              String line;
              while ( (line = reader.readLine()) != null) {
                  css.append(line);
                  css.append("\n");
              }
              in.close();
              
              // Resolve any EL value binding expression present in CSS
              // This should be Interpolator.interpolate, but it seems to break on CSS
              StringBuffer resolvedCSS = new StringBuffer(css.length());
              Matcher matcher =
                  Pattern.compile(
                      "#" +Pattern.quote("{") + "(.*)" + Pattern.quote("}")
                  ).matcher(css);
     
              while (matcher.find()) {
                  Expressions.ValueBinding valueMethod = Expressions.instance().createValueBinding("#{"+matcher.group(1)+"}");
                  String result = (String)valueMethod.getValue();
                  if (result != null) {
                      matcher.appendReplacement(resolvedCSS, result);
                  } else {
                      matcher.appendReplacement(resolvedCSS, "");
                  }
              }
              matcher.appendTail(resolvedCSS);
              response.getWriter().write(resolvedCSS.toString());
              
              response.getWriter().flush();
           } 
           finally
           {
              Lifecycle.endRequest();
           }
        }
        else
        {
           response.sendError(HttpServletResponse.SC_NOT_FOUND);
        }
        
     }
  
     @Override
     protected String getResourcePath()
     {
        return RESOURCE_PATH;
     }
  
  }