001 // Copyright 2007, 2008 The Apache Software Foundation
002 //
003 // Licensed under the Apache License, Version 2.0 (the "License");
004 // you may not use this file except in compliance with the License.
005 // You may obtain a copy of the License at
006 //
007 // http://www.apache.org/licenses/LICENSE-2.0
008 //
009 // Unless required by applicable law or agreed to in writing, software
010 // distributed under the License is distributed on an "AS IS" BASIS,
011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012 // See the License for the specific language governing permissions and
013 // limitations under the License.
014
015 package org.apache.tapestry5.internal.renderers;
016
017 import org.apache.tapestry5.MarkupWriter;
018 import org.apache.tapestry5.dom.Element;
019 import org.apache.tapestry5.ioc.Location;
020 import org.apache.tapestry5.ioc.Resource;
021 import org.apache.tapestry5.ioc.ScopeConstants;
022 import org.apache.tapestry5.ioc.annotations.Scope;
023 import org.apache.tapestry5.ioc.internal.util.CollectionFactory;
024 import org.apache.tapestry5.ioc.internal.util.InternalUtils;
025 import org.apache.tapestry5.services.ObjectRenderer;
026
027 import java.io.*;
028 import java.util.Set;
029
030 /**
031 * Responsible for rendering a {@link Location}. It is designed to only perform the full output (which includes a
032 * snippet of the source file) once per render. This requires the use of the "perthread" scope (since the service
033 * tracks, internally, which locations have already been rendered, to avoid repetition).
034 */
035 @Scope(ScopeConstants.PERTHREAD)
036 public class LocationRenderer implements ObjectRenderer<Location>
037 {
038 private static final int RANGE = 5;
039
040 private final Set<Location> rendered = CollectionFactory.newSet();
041
042 public void render(Location location, MarkupWriter writer)
043 {
044 writer.write(location.toString());
045
046 /** If the full details were already rendered this request, then skip the rest. */
047 if (rendered.contains(location)) return;
048
049 rendered.add(location);
050
051 Resource r = location.getResource();
052 int line = location.getLine();
053
054 // No line number? then nothing more to render.
055
056 if (line <= 0) return;
057
058 if (!r.exists()) return;
059
060
061 int start = line - RANGE;
062 int end = line + RANGE;
063
064 writer.element("table", "class", "t-location-outer");
065
066 LineNumberReader reader = null;
067
068 try
069 {
070 InputStream is = r.openStream();
071 InputStreamReader isr = new InputStreamReader(is);
072 reader = new LineNumberReader(new BufferedReader(isr));
073
074 while (true)
075 {
076 String input = reader.readLine();
077
078 if (input == null) break;
079
080 int current = reader.getLineNumber();
081
082 if (current < start) continue;
083
084 if (current > end) break;
085
086 writer.element("tr");
087
088 writer.element("td", "class", "t-location-line");
089
090 if (line == current) writer.getElement().addClassName("t-location-current");
091
092 writer.write(Integer.toString(current));
093 writer.end();
094
095 Element td = writer.element("td", "class", "t-location-content");
096
097 if (line == current) td.addClassName("t-location-current");
098
099 if (start == current) td.addClassName("t-location-content-first");
100
101 writer.write(input);
102 writer.end();
103
104 writer.end(); // tr
105 }
106
107 reader.close();
108 reader = null;
109 }
110 catch (IOException ex)
111 {
112 writer.write(ex.toString());
113 }
114 finally
115 {
116 InternalUtils.close(reader);
117 }
118
119 writer.end(); // div
120 }
121 }