001 // Copyright 2005 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.tapestry.html;
016
017 import java.util.Collections;
018 import java.util.Iterator;
019 import java.util.List;
020 import java.util.Properties;
021 import java.util.StringTokenizer;
022
023 import org.apache.tapestry.BaseComponent;
024 import org.apache.tapestry.IMarkupWriter;
025 import org.apache.tapestry.IRender;
026 import org.apache.tapestry.IRequestCycle;
027 import org.apache.tapestry.describe.ReportStatusHub;
028 import org.apache.tapestry.web.WebUtils;
029
030 /**
031 * Supports the {@link org.apache.tapestry.pages.Exception} page by displaying the request,
032 * session, servlet context and servlet object for the current request.
033 *
034 * @author Howard M. Lewis Ship
035 * @since 4.0
036 */
037 public abstract class RequestDisplay extends BaseComponent
038 {
039 private boolean _even;
040
041 // Injected
042
043 public abstract ReportStatusHub getReportStatusHub();
044
045 public void renderSystemProperties(IMarkupWriter writer)
046 {
047 _even = true;
048
049 Properties p = System.getProperties();
050
051 String pathSeparator = p.getProperty("path.separator");
052
053 writer.begin("div");
054 writer.attribute("class", "described-object-title");
055 writer.print("JVM System Properties");
056 writer.end();
057 writer.println();
058
059 writer.begin("table");
060 writer.attribute("class", "described-object");
061
062 Iterator i = WebUtils.toSortedList(p.keys()).iterator();
063
064 while (i.hasNext())
065 {
066 String key = (String) i.next();
067 String value = p.getProperty(key);
068
069 renderKeyAndValue(writer, key, value, pathSeparator);
070 }
071
072 writer.end();
073 }
074
075 private void renderKeyAndValue(IMarkupWriter writer, String key, String value,
076 String pathSeparator)
077 {
078 String[] values = split(key, value, pathSeparator);
079
080 for (int i = 0; i < values.length; i++)
081 {
082 writer.begin("tr");
083
084 writer.attribute("class", _even ? "even" : "odd");
085
086 _even = !_even;
087
088 writer.begin("th");
089
090 if (i == 0)
091 writer.print(key);
092
093 writer.end();
094 writer.begin("td");
095 writer.print(values[i]);
096 writer.end("tr");
097 writer.println();
098 }
099 }
100
101 private String[] split(String key, String value, String pathSeparator)
102 {
103 if (!key.endsWith(".path"))
104 return new String[]
105 { value };
106
107 StringTokenizer tokenizer = new StringTokenizer(value, pathSeparator);
108 List values = Collections.list(tokenizer);
109
110 return (String[]) values.toArray(new String[values.size()]);
111 }
112
113 public IRender getSystemPropertiesRenderer()
114 {
115 return new IRender()
116 {
117 public void render(IMarkupWriter writer, IRequestCycle cycle)
118 {
119 renderSystemProperties(writer);
120 }
121 };
122 }
123
124 public IRender getReportStatusRenderer()
125 {
126 return new IRender()
127 {
128 public void render(IMarkupWriter writer, IRequestCycle cycle)
129 {
130 getReportStatusHub().fireReportStatus(writer);
131 }
132 };
133 }
134 }