Commit of the iPOJO Webconsole plugin

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@789599 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/ipojo/pom.xml b/ipojo/pom.xml
index b3500aa..f393973 100644
--- a/ipojo/pom.xml
+++ b/ipojo/pom.xml
@@ -30,7 +30,7 @@
   <name>Apache Felix iPOJO</name>
   <version>1.3.0-SNAPSHOT</version>
   <packaging>pom</packaging>
-  
+
   	<modules>
 		<module>metadata</module>
 		<module>manipulator</module>
@@ -48,8 +48,8 @@
 		<module>online-manipulator</module>
 		<module>junit4osgi</module>
 	</modules>
-		
-	
+
+
   <profiles>
 	<profile>
 		<id>java5</id>
@@ -59,6 +59,7 @@
 		<modules>
 			<module>annotations</module>
 			<module>handler/jmx</module>
+			<module>webconsole-plugin</module>
 		</modules>
 	</profile>
 	<profile>
@@ -69,6 +70,7 @@
 		<modules>
 			<module>annotations</module>
 			<module>handler/jmx</module>
+			<module>webconsole-plugin</module>
 		</modules>
 	</profile>
 	<profile>
@@ -84,7 +86,7 @@
 		</modules>
 	</profile>
   </profiles>
-  
+
     <build>
     <plugins>
       <plugin>
@@ -101,7 +103,7 @@
     </plugins>
   </build>
 
-  
+
   <reporting>
     <plugins>
       <plugin>
diff --git a/ipojo/webconsole-plugin/LICENSE b/ipojo/webconsole-plugin/LICENSE
new file mode 100644
index 0000000..d645695
--- /dev/null
+++ b/ipojo/webconsole-plugin/LICENSE
@@ -0,0 +1,202 @@
+
+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
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+      of this License, Derivative Works shall not include works that remain
+      separable from, or merely link (or bind by name) to the interfaces of,
+      the Work and Derivative Works thereof.
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+      "Contribution" shall mean any work of authorship, including
+      the original version of the Work and any modifications or additions
+      to that Work or Derivative Works thereof, that is intentionally
+      submitted to Licensor for inclusion in the Work by the copyright owner
+      or by an individual or Legal Entity authorized to submit on behalf of
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+      communication on electronic mailing lists, source code control systems,
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+   4. Redistribution. You may reproduce and distribute copies of the
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+      meet the following conditions:
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+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
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+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
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+      any Contribution intentionally submitted for inclusion in the Work
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+      the terms of any separate license agreement you may have executed
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diff --git a/ipojo/webconsole-plugin/NOTICE b/ipojo/webconsole-plugin/NOTICE
new file mode 100644
index 0000000..c0ac7a1
--- /dev/null
+++ b/ipojo/webconsole-plugin/NOTICE
@@ -0,0 +1,22 @@
+Apache Felix iPOJO Webconsole Plugins
+Copyright 2008-2009 The Apache Software Foundation
+
+I. Included Software
+
+This product includes software developed at
+The Apache Software Foundation (http://www.apache.org/).
+Licensed under the Apache License 2.0.
+
+II. Used Software
+
+This product uses software developed at
+The OSGi Alliance (http://www.osgi.org/).
+Copyright (c) OSGi Alliance (2000, 2007).
+Licensed under the Apache License 2.0.
+
+This product uses software developed at
+The Apache Software Foundation (http://www.apache.org/).
+Licensed under the Apache License 2.0.
+
+III. License Summary
+- Apache License 2.0
diff --git a/ipojo/webconsole-plugin/metadata.xml b/ipojo/webconsole-plugin/metadata.xml
new file mode 100644
index 0000000..f2ac6a6
--- /dev/null
+++ b/ipojo/webconsole-plugin/metadata.xml
@@ -0,0 +1,21 @@
+<!--
+	Licensed to the Apache Software Foundation (ASF) under one
+	or more contributor license agreements.  See the NOTICE file
+	distributed with this work for additional information
+	regarding copyright ownership.  The ASF licenses this file
+	to you 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.
+-->
+<ipojo>
+	<instance component="org.apache.felix.org.apache.felix.ipojo.webconsole.IPOJOServlet"/>
+</ipojo>
\ No newline at end of file
diff --git a/ipojo/webconsole-plugin/pom.xml b/ipojo/webconsole-plugin/pom.xml
new file mode 100644
index 0000000..511cd10
--- /dev/null
+++ b/ipojo/webconsole-plugin/pom.xml
@@ -0,0 +1,83 @@
+<!--
+	Licensed to the Apache Software Foundation (ASF) under one
+	or more contributor license agreements.  See the NOTICE file
+	distributed with this work for additional information
+	regarding copyright ownership.  The ASF licenses this file
+	to you 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.
+-->
+<project>
+	<modelVersion>4.0.0</modelVersion>
+	<packaging>bundle</packaging>
+	<groupId>org.apache.felix</groupId>
+	<artifactId>org.apache.felix.ipojo.webconsole</artifactId>
+	<version>1.3.0-SNAPSHOT</version>
+	<name>iPOJO WebConsole Plugins</name>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<configuration>
+					<source>1.5</source>
+					<target>1.5</target>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.felix</groupId>
+				<artifactId>maven-bundle-plugin</artifactId>
+				<version>1.4.3</version>
+				<extensions>true</extensions>
+				<configuration>
+					<instructions>
+						<Bundle-SymbolicName>${pom.artifactId}
+						</Bundle-SymbolicName>
+						<Private-Package>
+							org.apache.felix.org.apache.felix.ipojo.webconsole
+						</Private-Package>
+						<Import-Package>*</Import-Package>
+					</instructions>
+				</configuration>
+			</plugin>
+			<plugin>
+				<groupId>org.apache.felix</groupId>
+				<artifactId>maven-ipojo-plugin</artifactId>
+				<executions>
+					<execution>
+						<goals>
+							<goal>ipojo-bundle</goal>
+						</goals>
+					</execution>
+				</executions>
+			</plugin>
+		</plugins>
+	</build>
+	<dependencies>
+		<dependency>
+			<groupId>org.apache.felix</groupId>
+			<artifactId>org.apache.felix.webconsole</artifactId>
+			<version>1.2.11-SNAPSHOT</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.felix</groupId>
+			<artifactId>org.apache.felix.ipojo</artifactId>
+			<version>1.3.0-SNAPSHOT</version>
+		</dependency>
+		<dependency>
+			<groupId>org.apache.felix</groupId>
+			<artifactId>org.apache.felix.ipojo.annotations</artifactId>
+			<version>1.3.0-SNAPSHOT</version>
+		</dependency>
+	</dependencies>
+</project>
diff --git a/ipojo/webconsole-plugin/src/main/java/org/apache/felix/org/apache/felix/ipojo/webconsole/IPOJOServlet.java b/ipojo/webconsole-plugin/src/main/java/org/apache/felix/org/apache/felix/ipojo/webconsole/IPOJOServlet.java
new file mode 100644
index 0000000..76b011c
--- /dev/null
+++ b/ipojo/webconsole-plugin/src/main/java/org/apache/felix/org/apache/felix/ipojo/webconsole/IPOJOServlet.java
@@ -0,0 +1,843 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.felix.org.apache.felix.ipojo.webconsole;
+
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Enumeration;
+import java.util.List;
+import java.util.Properties;
+
+import javax.servlet.Servlet;
+import javax.servlet.ServletException;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+
+import org.apache.felix.ipojo.ComponentInstance;
+import org.apache.felix.ipojo.Factory;
+import org.apache.felix.ipojo.HandlerFactory;
+import org.apache.felix.ipojo.annotations.Component;
+import org.apache.felix.ipojo.annotations.Invalidate;
+import org.apache.felix.ipojo.annotations.Provides;
+import org.apache.felix.ipojo.annotations.Requires;
+import org.apache.felix.ipojo.annotations.ServiceProperty;
+import org.apache.felix.ipojo.architecture.Architecture;
+import org.apache.felix.ipojo.architecture.ComponentTypeDescription;
+import org.apache.felix.ipojo.architecture.HandlerDescription;
+import org.apache.felix.ipojo.architecture.InstanceDescription;
+import org.apache.felix.ipojo.architecture.PropertyDescription;
+import org.apache.felix.ipojo.handlers.dependency.DependencyDescription;
+import org.apache.felix.ipojo.handlers.dependency.DependencyHandlerDescription;
+import org.apache.felix.ipojo.handlers.providedservice.ProvidedService;
+import org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceDescription;
+import org.apache.felix.ipojo.handlers.providedservice.ProvidedServiceHandlerDescription;
+import org.apache.felix.ipojo.util.DependencyModel;
+import org.apache.felix.webconsole.AbstractWebConsolePlugin;
+import org.osgi.framework.BundleContext;
+import org.osgi.framework.Constants;
+import org.osgi.framework.ServiceReference;
+
+/**
+ * iPOJO Plugin for the web console.
+ * @author <a href="mailto:dev@felix.apache.org">Felix Project Team</a>
+ */
+@Component(immediate = true)
+@Provides(specifications = { Servlet.class })
+public class IPOJOServlet extends AbstractWebConsolePlugin {
+
+    /**
+     * Factory constant.
+     */
+    public static final String FACTORY = "factory";
+
+    /**
+     * Instance constant.
+     */
+    public static final String INSTANCE = "instance";
+
+    /**
+     * Handler constant.
+     */
+    public static final String HANDLER = "handler";
+
+    /**
+     * All constant.
+     */
+    public static final String ALL = "all";
+
+    /**
+     * UUID.
+     */
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * Label used by the web console.
+     */
+    @ServiceProperty(name = "felix.webconsole.label")
+    private String m_label = "ipojo";
+
+    /**
+     * Title used by the web console.
+     */
+    @ServiceProperty(name = "felix.webconsole.title")
+    private String m_title = "iPOJO";
+
+    /**
+     * List of available Architecture service.
+     */
+    @Requires(optional = true, specification = "org.apache.felix.ipojo.architecture.Architecture")
+    private List<Architecture> m_archs;
+
+    /**
+     * List of available Factories.
+     */
+    @Requires(optional = true, specification = "org.apache.felix.ipojo.Factory")
+    private List<Factory> m_factories;
+
+    /**
+     * List of available Handler Factories.
+     */
+    @Requires(optional = true, specification = "org.apache.felix.ipojo.HandlerFactory")
+    private List<HandlerFactory> m_handlers;
+
+    /**
+     * Creates a IPOJOServlet.
+     * This method activates the plugin.
+     * @param bc the bundle context
+     */
+    public IPOJOServlet(BundleContext bc) {
+        activate(bc);
+    }
+
+    /**
+     * Stop method.
+     * This method deactivates the plugin.
+     */
+    @Invalidate
+    public void stop() {
+        deactivate();
+    }
+
+
+    /**
+     * Gets the plugin label.
+     * @return the label
+     * @see org.apache.felix.webconsole.AbstractWebConsolePlugin#getLabel()
+     */
+    public String getLabel() {
+        return m_label;
+    }
+
+    /**
+     * Gets the plugin title.
+     * @return the title
+     * @see org.apache.felix.webconsole.AbstractWebConsolePlugin#getTitle()
+     */
+    public String getTitle() {
+        return m_title;
+    }
+
+    /**
+     * Gets the number of valid instances.
+     * @return the number of valid instances.
+     */
+    private int getValidCount() {
+        int i = 0;
+        for (Architecture a : m_archs) {
+            if (a.getInstanceDescription().getState() == ComponentInstance.VALID) {
+                i ++;
+            }
+        }
+        return i;
+    }
+
+    /**
+     * Gets the number of invalid instances.
+     * @return the number of invalid instances.
+     */
+    private int getInvalidCount() {
+        int i = 0;
+        for (Architecture a : m_archs) {
+            if (a.getInstanceDescription().getState() == ComponentInstance.INVALID) {
+                i ++;
+            }
+        }
+        return i;
+    }
+
+    /**
+     * Gets the HTML content of the plugin.
+     * @param req the request
+     * @param res the response
+     * @throws ServletException if the content cannot be computed
+     * @throws IOException if an IO Exception occurs
+     * @see org.apache.felix.webconsole.AbstractWebConsolePlugin#renderContent(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
+     */
+    protected void renderContent(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException {
+
+        PrintWriter writer = res.getWriter();
+        // Set the fable plugin_table sortable.
+        writer.write("<script type=\"text/javascript\"> "
+                 + "function setSortable() { \n"
+                 + "$(document).ready(function() { \n"
+                 + "$(\"#plugin_table\").tablesorter(); \n"
+                 + "})};\n"
+                 + "setSortable();"
+                 + "</script>");
+        // Status Line
+        writer.write("<div class=\"fullwidth\"><div class=\"statusline\">"
+                + m_archs.size() + " instances in total, "
+                + getValidCount() + " valid instances, "
+                + getInvalidCount() + " invalid instances."
+                +        "</div></div>");
+        // Button Line
+        writer.write("<form action=\"ipojo\" method=\"get\">"
+                + "<div class=\"fullwidth\">"
+                + "<div class=\"buttons\">"
+                + "<button style=\"margin-left: 30px;\" name=\"" + INSTANCE + "\" value=\"all\" type=\"submit\">Instances</button>"
+                + "<button style=\"margin-left: 30px;\" name=\"" + FACTORY + "\" value=\"all\" type=\"submit\">Factories</button>"
+                + "<button style=\"margin-left: 30px;\" name=\"" + HANDLER + "\" value=\"all\" type=\"submit\">Handlers</button>"
+                + "</div>"
+                + "</div>"
+                + "</form>");
+
+        // Compute the request and select the content to return
+        RequestInfo ri = new RequestInfo(req);
+        if (ri.m_type.equals(FACTORY)) {
+            if (ri.m_all) {
+                printFactoryList(writer);
+            } else {
+                printFactoryDetail(writer, ri.m_name);
+            }
+        }
+
+        if (ri.m_type.equals(INSTANCE)) {
+            if (ri.m_all) {
+                printInstanceList(writer);
+            } else {
+                printInstanceDetail(writer, ri.m_name);
+            }
+        }
+
+        if (ri.m_type.equals(HANDLER)) {
+            if (ri.m_all) {
+                printHandlerList(writer);
+            }
+        }
+
+        // Button Line
+        writer.write("<form action=\"ipojo\" method=\"get\">"
+                + "<div class=\"fullwidth\">"
+                + "<div class=\"buttons\">"
+                + "<button style=\"margin-left: 30px;\" name=\"" + INSTANCE + "\" value=\"all\" type=\"submit\">Instances</button>"
+                + "<button style=\"margin-left: 30px;\" name=\"" + FACTORY + "\" value=\"all\" type=\"submit\">Factories</button>"
+                + "<button style=\"margin-left: 30px;\" name=\"" + HANDLER + "\" value=\"all\" type=\"submit\">Handlers</button>"
+                + "</div>"
+                + "</div>"
+                + "</form>");
+
+        // Status Line
+        writer.write("<div class=\"fullwidth\"><div class=\"statusline\">"
+                + m_archs.size() + " instances in total, "
+                + getValidCount() + " valid instances, "
+                + getInvalidCount() + " invalid instances."
+                +        "</div></div>");
+
+    }
+
+    /**
+     * Gets a Factory Detail page.
+     * This page contains all versions of the factories.
+     * @param pw the writer
+     * @param name the name of the factory
+     */
+    private void printFactoryDetail(PrintWriter pw, String name) {
+        List<ComponentTypeDescription> fs = new ArrayList<ComponentTypeDescription>();
+        for (Factory f : this.m_factories) {
+            if (f.getName().equals(name)) {
+                fs.add(f.getComponentDescription());
+            }
+        }
+
+        pw.write("<div class=\"table\">");
+        if (fs.isEmpty()) {
+            pw.write("<b>Factory not found</b><br>The factory " + name + " does not exist or is private");
+        } else {
+            for (ComponentTypeDescription factory : fs) {
+                pw.write("<table class=\"tablelayout\" border=\"0\"><tbody>");
+                addEntry(pw, "Factory Name", factory.getName());
+                if (factory.getVersion() != null) {
+                    addEntry(pw, "Factory Version", factory.getVersion());
+                }
+                addEntry(pw, "State", getFactoryState(factory.getFactory().getState()));
+
+                addEntry(pw, " ", " ");
+                if (factory.getprovidedServiceSpecification() != null && factory.getprovidedServiceSpecification().length != 0) {
+                    addEntry(pw, "Provided Service Specification", Arrays.toString(factory.getprovidedServiceSpecification()));
+                }
+                if (factory.getProperties() != null && factory.getProperties().length != 0) {
+                    addEntry(pw, "Properties", getProperties(factory.getProperties()));
+                }
+
+                addEntry(pw, " ", " ");
+                addEntry(pw, "Required Handlers", factory.getFactory().getRequiredHandlers().toString());
+                addEntry(pw, "Missing Handlers", factory.getFactory().getMissingHandlers().toString());
+                addEntry(pw, " ", " ");
+                addEntry(pw, "Created Instances", getInstanceList(factory.getName()));
+
+                addEntry(pw, " ", " ");
+                addEntry(pw, "Architecture",
+                        "<div style=\"overflow: auto; width:800px; border: 1px solid #666; background-color: #ccc; padding: 8px;\"><pre>"
+                            + factory.getDescription().toString()
+                            + "</pre></div>");
+                pw.write("</tbody></table>");
+            }
+        }
+        pw.write("</div>");
+    }
+
+
+    /**
+     * Gets component type properties HTML table.
+     * @param properties the properties to display
+     * @return the HTML code of the table
+     */
+    private String getProperties(PropertyDescription[] properties) {
+        String s = "<table class=\"tablelayout\" style=\"border-top: 1px solid #6181A9;\">"
+                + "<thead style=\"border-top: 1px solid #6181A9;\">"
+                + "<tr>"
+                + "<th>Property Name</th>"
+                + "<th>Property Type</th>"
+                + "<th>Mandatory</th>"
+                + "<th>Immutable</th>"
+                + "<th>Value</th>"
+                + "</tr>"
+                + "</thead>"
+                + "<tbody>";
+        for (PropertyDescription pd : properties) {
+            String name = pd.getName();
+            String type = pd.getType();
+            boolean mandatory = pd.isMandatory();
+            boolean immutable = pd.isImmutable();
+            String value = pd.getValue();
+            s += "<tr>"
+                + "<td>" + name + "</td>"
+                + "<td>" + type + "</td>"
+                + "<td>" + "" + mandatory + "</td>"
+                + "<td>" + "" + immutable + "</td>"
+                + "<td>" + (value == null ? "<i>No Value</i>" : value) + "</td>"
+                + "</tr>";
+        }
+        s += "</tbody></table>";
+        return s;
+    }
+
+    /**
+     * Gets the instance list page.
+     * @param pw the writer
+     */
+    private void printInstanceList(PrintWriter pw) {
+        pw.write("<div class=\"table\">"
+                + "<table id=\"plugin_table\" class=\"tablelayout\">"
+                + "<thead>"
+                + "<tr>"
+                + "<th class=\"col_Name header headerSortDown\">Instance Name</th>"
+                + "<th class=\"col_Factory header \">Factory Name</th>"
+                + "<th class=\"col_State header \">State</th>"
+                + "</tr>"
+                + "</thead>"
+                + "<tbody>");
+
+        for (Architecture arch : m_archs) {
+            InstanceDescription id = arch.getInstanceDescription();
+            String name = id.getName();
+            String factory = id.getComponentDescription().getName();
+            String state = getInstanceState(id.getState());
+
+            pw.write("<tr>"
+                    + "<td>" + getInstanceLink(name) + "</td>"
+                    + "<td>" + factory + "</td>"
+                    + "<td>" + state + "</td>"
+                    + "</tr>");
+
+        }
+
+        pw.write("</tbody></table>");
+    }
+
+    /**
+     * Adds a line into a key / value table.
+     * @param pw the writer
+     * @param header the key
+     * @param value the value (may be HTML code)
+     */
+    private void addEntry(PrintWriter pw, String header, String value) {
+        pw.write(addEntry(header, value));
+
+    }
+
+    /**
+     * Gets the HTML code of a key / value table row.
+     * @param header the key
+     * @param value the value (may be HTML code)
+     * @return the HTML code of the line
+     */
+    private String addEntry(String header, String value) {
+        return "<tr>"
+                + "<td class=\"aligntop\" nowrap=\"true\" style=\"border: 0px none;\">" + header + "</td>"
+                + "<td class=\"aligntop\" style=\"border: 0px none ;\">" + value + "</td>"
+                + "</tr>";
+    }
+
+    /**
+     * Gets the factory link if the factory exists.
+     * @param id the factory name
+     * @return the HTML link targetting the detail of the factory or just the factory name.
+     */
+    private String getFactoryLinkIfPossible(InstanceDescription id) {
+        String n = id.getComponentDescription().getName();
+        System.out.println("Look for " + n);
+        for (Factory f : m_factories) {
+            if (f.getName().equals(n)) {
+                return "<a href=\"ipojo?factory=" + n + "\">" + n + "</a>";
+            }
+        }
+
+        return n; // No link
+    }
+
+    /**
+     * Gets the list of invalid handler.
+     * @param hl the handler description list.
+     * @return the list of invalid handlers.
+     */
+    private String getInvalidHandlerList(HandlerDescription[] hl) {
+        List<String> list = new ArrayList<String>();
+        for (HandlerDescription hd : hl) {
+            if (! hd.isValid()) {
+                list.add(hd.getHandlerName());
+            }
+        }
+        return list.toString();
+    }
+
+    /**
+     * Gets the page containing instance detail.
+     * @param pw the writer
+     * @param name the instance name
+     */
+    private void printInstanceDetail(PrintWriter pw, String name) {
+        InstanceDescription desc = getInstanceDescriptionByName(name);
+        pw.write("<div class=\"table\">");
+        if (desc == null) {
+            pw.write("<b>Instance not found</b><br>The instance " + name + " does not exist or does not expose its architecture");
+        } else {
+            pw.write("<table class=\"tablelayout\" border=\"0\"><tbody>");
+            addEntry(pw, "Instance Name", desc.getName());
+            addEntry(pw, "Factory", getFactoryLinkIfPossible(desc));
+            if (desc.getState() == ComponentInstance.INVALID) {
+                addEntry(pw, "Invalid Handlers", getInvalidHandlerList(desc.getHandlers()));
+            }
+            addEntry(pw, " ", " ");
+            addEntry(pw, "Provided Services", getProvidedServiceDetail(desc.getHandlerDescription("org.apache.felix.ipojo:provides")));
+            addEntry(pw, "Required Services", getRequiredServiceDetail(desc.getHandlerDescription("org.apache.felix.ipojo:requires")));
+
+            addEntry(pw, " ", " ");
+            addEntry(pw, "Architecture",
+                    "<div style=\"overflow: auto; width:800px; border: 1px solid #666; background-color: #ccc; padding: 8px;\"><pre>"
+                        + desc.getDescription().toString()
+                        + "</pre></div>");
+            pw.write("</tbody></table>");
+        }
+        pw.write("</div>");
+    }
+
+    /**
+     * Gets the HTML link targeting this instance.
+     * @param name the instance name
+     * @return the HTML link targetting the instance detail
+     */
+    private String getInstanceLink(String name) {
+        return "<a href=\"ipojo?instance=" + name + "\">" + name + "</a>";
+    }
+
+    /**
+     * Gets the HTML list of service properties.
+     * @param properties the properties
+     * @return the HTML code containing the service properties.
+     */
+    private String getServiceProperties(Properties properties) {
+        String s = "<ul>";
+        Enumeration<Object> e = properties.keys();
+        while (e.hasMoreElements()) {
+            String key = (String) e.nextElement();
+            String value = properties.get(key).toString();
+            s += "<li>" + key + " = " + value + "</li>";
+        }
+        s += "</ul>";
+        return s;
+    }
+
+    /**
+     * Gets the instance list created by the given factory.
+     * @param factory the factory name
+     * @return the HTML list containing the created instances
+     */
+    private String getInstanceList(String factory) {
+        String s = "<ul>";
+        for (Architecture arch : m_archs) {
+            String n = arch.getInstanceDescription().getComponentDescription().getName();
+            if (factory.equals(n)) {
+                s += "<li>" + getInstanceLink(arch.getInstanceDescription().getName()) + "</li>";
+            }
+        }
+        s += "</ul>";
+        return s;
+    }
+
+    /**
+     * Gets the HTML list containing service references.
+     * If the service is provided by an iPOJO instance, the link is inserted.
+     * @param refs the references.
+     * @return the HTML list
+     */
+    private String getServiceReferenceList(List<ServiceReference> refs) {
+        String s = "<ul>";
+        for (ServiceReference ref : refs) {
+            s += "<li>";
+            if (ref.getProperty("instance.name") == null) {
+                s += ref.getProperty(Constants.SERVICE_ID);
+            } else {
+                s += "<a href=\"ipojo?instance="
+                        + ref.getProperty("instance.name") + "\">"
+                        + ref.getProperty("instance.name") + " (" +  ref.getProperty(Constants.SERVICE_ID) + ")</a>";
+            }
+            s += "</li>";
+        }
+        s += "</ul>";
+        return s;
+    }
+
+    /**
+     * Gets provided service details.
+     * @param hd the provided service handler description or <code>null</code> if not found.
+     * @return the details about provided services
+     */
+    private String getProvidedServiceDetail(HandlerDescription hd) {
+        if (hd == null) {
+            return "No provided services";
+        }
+
+        String r = "";
+        ProvidedServiceHandlerDescription desc = (ProvidedServiceHandlerDescription) hd;
+
+        for (ProvidedServiceDescription ps : desc.getProvidedServices()) {
+            r += "<table border=\"0\"><tbody>";
+            r += addEntry("Specification", Arrays.toString(ps.getServiceSpecifications()));
+            r += addEntry("State", getProvidedServiceState(ps.getState()));
+            if (ps.getServiceReference() != null) {
+                r += addEntry("Service Id", ((Long) ps.getServiceReference().getProperty(Constants.SERVICE_ID)).toString());
+            }
+            r += addEntry("Service Properties", getServiceProperties(ps.getProperties()));
+
+            r += "</tbody></table>";
+            r += "<hr style=\"color: #CCCCCC;'\"/>";
+        }
+
+        return r;
+
+    }
+
+    /**
+     * Gets required service details.
+     * @param hd the required service handler description or <code>null</code> if not found.
+     * @return the details about required services
+     */
+    private String getRequiredServiceDetail(
+            HandlerDescription hd) {
+        if (hd == null) {
+            return "No required services";
+        }
+        String r = "";
+        DependencyHandlerDescription desc = (DependencyHandlerDescription) hd;
+        for (DependencyDescription dep : desc.getDependencies()) {
+            r += "<table border=\"0\" style=\"margin-bottom:5px\"><tbody>";
+            r += addEntry("Specification", dep.getSpecification());
+            r += addEntry("Id", "" + dep.getId());
+            r += addEntry("State", getDependencyState(dep.getState()));
+            r += addEntry("Binding Policy" , getDependencyBindingPolicy(dep.getPolicy()));
+            r += addEntry("Optional", "" + dep.isOptional());
+            r += addEntry("Aggregate", "" + dep.isMultiple());
+            if (dep.getFilter() != null) {
+                r += addEntry("Filter", "" + dep.getFilter());
+            }
+            if (dep.getComparator() != null) {
+                r += addEntry("Comparator", "" + dep.getComparator());
+            }
+            r += addEntry("Matching Service", getServiceReferenceList(dep.getServiceReferences()));
+            r += addEntry("Used Service", getServiceReferenceList(dep.getUsedServices()));
+
+            r += "</tbody></table>";
+            r += "<hr style=\"color: #CCCCCC;'\"/>";
+
+        }
+
+        return r;
+    }
+
+    /**
+     * Gets the instance description by name.
+     * @param name the instance name
+     * @return the instance description or <code>null</code> if not found
+     */
+    private InstanceDescription getInstanceDescriptionByName(String name) {
+        for (Architecture arch : m_archs) {
+            if (name.equals(arch.getInstanceDescription().getName())) {
+                return arch.getInstanceDescription();
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Prints the factory list.
+     * @param pw the writer.
+     */
+    private void printFactoryList(PrintWriter pw) {
+        pw.write("<div class=\"table\">"
+                + "<table id=\"plugin_table\" class=\"tablelayout\">"
+                + "<thead>"
+                + "<tr>"
+                + "<th class=\"col_Name header headerSortDown\">Factory Name</th>"
+                + "<th class=\"col_Bundle header \">Bundle</th>"
+                + "<th class=\"col_State header \">State</th>"
+                + "</tr>"
+                + "</thead>"
+                + "<tbody>");
+
+
+
+        for (Factory factory : m_factories) {
+            String name = factory.getName();
+            String version = factory.getVersion();
+            String state = getFactoryState(factory.getState());
+            String bundle = factory.getBundleContext().getBundle().getSymbolicName()
+                + " (" + factory.getBundleContext().getBundle().getBundleId() + ")";
+            pw.write("<tr>"
+                    + "<td><a href=\"ipojo?factory=" + name + "\">"
+                        + (version == null ? name : name + " (" + version + ")")
+                        + "</a></td>" //TODO Link
+                    + "<td>" + bundle + "</td>"
+                    + "<td>" + state + "</td>"
+                    + "</tr>");
+
+        }
+
+        pw.write("</tbody></table>");
+    }
+
+    /**
+     * Print the handler list.
+     * @param pw the writer.
+     */
+    private void printHandlerList(PrintWriter pw) {
+        pw.write("<div class=\"table\">"
+                + "<table id=\"plugin_table\" class=\"tablelayout\">"
+                + "<thead>"
+                + "<tr>"
+                + "<th class=\"col_Name header headerSortDown\">Handler Name</th>"
+                + "<th class=\"col_Type header \">Handler Type</th>"
+                + "<th class=\"col_Bundle header \">Bundle</th>"
+                + "<th class=\"col_State header \">State</th>"
+                + "<th class=\"col_MissingHandler header \">Missing Handler</th>"
+                + "</tr>"
+                + "</thead>"
+                + "<tbody>");
+
+
+
+        for (HandlerFactory hf : m_handlers) {
+            String name = hf.getHandlerName();
+            String type = hf.getType();
+            String state = getFactoryState(hf.getState());
+            String bundle = hf.getBundleContext().getBundle().getSymbolicName()
+                + " (" + hf.getBundleContext().getBundle().getBundleId() + ")";
+            String missing = hf.getMissingHandlers().isEmpty() ? "<i>no missing handlers</i>" : hf.getMissingHandlers().toString();
+            pw.write("<tr>"
+                    + "<td>" + name + "</td>"
+                    + "<td>" + type + "</td>"
+                    + "<td>" + bundle + "</td>"
+                    + "<td>" + state + "</td>"
+                    + "<td>" + missing + "</td>"
+                    + "</tr>");
+
+        }
+
+        pw.write("</tbody></table>");
+    }
+
+    /**
+     * Gets the instance state as a String.
+     * @param state the state.
+     * @return the String form of the state.
+     */
+    private String getInstanceState(int state) {
+        switch(state) {
+            case ComponentInstance.VALID :
+                return "valid";
+            case ComponentInstance.INVALID :
+                return "invalid";
+            case ComponentInstance.DISPOSED :
+                return "disposed";
+            case ComponentInstance.STOPPED :
+                return "stopped";
+            default :
+                return "unknown";
+        }
+    }
+
+    /**
+     * Gets the factory state as a String.
+     * @param state the state.
+     * @return the String form of the state.
+     */
+    private String getFactoryState(int state) {
+        switch(state) {
+            case Factory.VALID :
+                return "valid";
+            case Factory.INVALID :
+                return "invalid";
+            default :
+                return "unknown";
+        }
+    }
+
+    /**
+     * Gets the dependency state as a String.
+     * @param state the state.
+     * @return the String form of the state.
+     */
+    private String getDependencyState(int state) {
+        switch(state) {
+            case DependencyModel.RESOLVED :
+                return "resolved";
+            case DependencyModel.UNRESOLVED :
+                return "unresolved";
+            case DependencyModel.BROKEN :
+                return "broken";
+            default :
+                return "unknown (" + state + ")";
+        }
+    }
+
+    /**
+     * Gets the dependency binding policy as a String.
+     * @param policy the policy.
+     * @return the String form of the policy.
+     */
+    private String getDependencyBindingPolicy(int policy) {
+        switch(policy) {
+            case DependencyModel.DYNAMIC_BINDING_POLICY :
+                return "dynamic";
+            case DependencyModel.DYNAMIC_PRIORITY_BINDING_POLICY :
+                return "dynamic-priority";
+            case DependencyModel.STATIC_BINDING_POLICY :
+                return "static";
+            default :
+                return "unknown (" + policy + ")";
+        }
+    }
+
+    /**
+     * Gets the provided service state as a String.
+     * @param state the state.
+     * @return the String form of the state.
+     */
+    private String getProvidedServiceState(int state) {
+        switch(state) {
+            case ProvidedService.REGISTERED :
+                return "registered";
+            case ProvidedService.UNREGISTERED :
+                return "unregistered";
+            default :
+                return "unknown (" + state + ")";
+        }
+    }
+
+    private final class RequestInfo {
+        /**
+         * Name of the required element.
+         */
+        public final String m_name;
+        /**
+         * Type of the required element.
+         */
+        public final String m_type;
+        /**
+         * Is 'all' elements of the type required.
+         */
+        public final boolean m_all;
+
+        /**
+         * Creates a RequestInfo.
+         * This constructor parses the parameter of the request.
+         * @param request the request
+         */
+        protected RequestInfo(final HttpServletRequest request) {
+            String factory = request.getParameter(FACTORY);
+            String instance = request.getParameter(INSTANCE);
+            String handler = request.getParameter(HANDLER);
+
+            if (factory != null) {
+                m_type = FACTORY;
+                m_name = factory;
+            } else if (instance != null) {
+                m_type = INSTANCE;
+                m_name = instance;
+            } else if (handler != null) {
+                m_type = HANDLER;
+                m_name = handler;
+            } else {
+                m_type = INSTANCE;
+                m_name = ALL;
+            }
+
+            if (ALL.equals(m_name)) {
+                m_all = true;
+            } else {
+                m_all = false;
+            }
+
+            request.setAttribute(IPOJOServlet.class.getName(), this);
+        }
+
+        /**
+         * toString method.
+         * @return the String form of the request.
+         * @see java.lang.Object#toString()
+         */
+        public String toString() {
+            return "Request: " + m_type + "=" + m_name;
+        }
+
+    }
+
+}