// Copyright 2007, 2008 The Apache Software Foundation

 //

 // 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.apache.tapestry5.internal.renderers;

 import org.apache.tapestry5.MarkupWriter;

 import org.apache.tapestry5.dom.Element;

 import org.apache.tapestry5.ioc.Location;

 import org.apache.tapestry5.ioc.Resource;

 import org.apache.tapestry5.ioc.ScopeConstants;

 import org.apache.tapestry5.ioc.annotations.Scope;

 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;

 import org.apache.tapestry5.ioc.internal.util.InternalUtils;

 import org.apache.tapestry5.services.ObjectRenderer;

 import java.io.*;

 import java.util.Set;

 /**

  * Responsible for rendering a {@link Location}. It is designed to only perform the full output (which includes a

  * snippet of the source file) once per render. This requires the use of the "perthread" scope (since the service

  * tracks, internally, which locations have already been rendered, to avoid repetition).

  */

 @Scope(ScopeConstants.PERTHREAD)

 public class LocationRenderer implements ObjectRenderer<Location>

 {

     private static final int RANGE = 5;

     private final Set<Location> rendered = CollectionFactory.newSet();

     public void render(Location location, MarkupWriter writer)

     {

         writer.write(location.toString());

         /** If the full details were already rendered this request, then skip the rest. */

         if (rendered.contains(location)) return;

         rendered.add(location);

         Resource r = location.getResource();

         int line = location.getLine();

         // No line number? then nothing more to render.

         if (line <= 0) return;

         if (!r.exists()) return;

         int start = line - RANGE;

         int end = line + RANGE;

         writer.element("table", "class", "t-location-outer");

         LineNumberReader reader = null;

         try

         {

             InputStream is = r.openStream();

             InputStreamReader isr = new InputStreamReader(is);

             reader = new LineNumberReader(new BufferedReader(isr));

             while (true)

             {

                 String input = reader.readLine();

                 if (input == null) break;

                 int current = reader.getLineNumber();

                 if (current < start) continue;

                 if (current > end) break;

                 writer.element("tr");

                 writer.element("td", "class", "t-location-line");

                 if (line == current) writer.getElement().addClassName("t-location-current");

                 writer.write(Integer.toString(current));

                 writer.end();

                 Element td = writer.element("td", "class", "t-location-content");

                 if (line == current) td.addClassName("t-location-current");

                 if (start == current) td.addClassName("t-location-content-first");

                 writer.write(input);

                 writer.end();

                 writer.end(); // tr

             }

             reader.close();

             reader = null;

         }

         catch (IOException ex)

         {

             writer.write(ex.toString());

         }

         finally

         {

             InternalUtils.close(reader);

         }

         writer.end(); // div

     }

 }