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
015package org.apache.tapestry.html;
016
017import java.util.Collections;
018import java.util.Iterator;
019import java.util.List;
020import java.util.Properties;
021import java.util.StringTokenizer;
022
023import org.apache.tapestry.BaseComponent;
024import org.apache.tapestry.IMarkupWriter;
025import org.apache.tapestry.IRender;
026import org.apache.tapestry.IRequestCycle;
027import org.apache.tapestry.describe.ReportStatusHub;
028import 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 */
037public 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}