org.apache.felix.webconsole
Class SimpleWebConsolePlugin

java.lang.Object
  javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
          org.apache.felix.webconsole.AbstractWebConsolePlugin
              org.apache.felix.webconsole.SimpleWebConsolePlugin

All Implemented Interfaces:

java.io.Serializable, javax.servlet.Servlet, javax.servlet.ServletConfig

public abstract class SimpleWebConsolePlugin
extends AbstractWebConsolePlugin

SimpleWebConsolePlugin is an utility class that provides default implementation of the AbstractWebConsolePlugin and supports the following features:

• Methods for (un)registering the web console plugin service
• Default implementation for resource loading

See Also:

Serialized Form

Field Summary

Fields inherited from class org.apache.felix.webconsole.AbstractWebConsolePlugin

ATTR_FILEUPLOAD, GET_RESOURCE_METHOD_NAME

Constructor Summary

SimpleWebConsolePlugin(java.lang.String label, java.lang.String title, java.lang.String[] css)
Creates new Simple Web Console Plugin.

Method Summary

void	deactivate() This method will close all service trackers, created by getService(String) method.
protected java.lang.String[]	getCssReferences() Returns a list of CSS reference paths or null if no additional CSS files are provided by the plugin.
java.lang.String	getLabel() Retrieves the label.
protected java.net.URL	getResource(java.lang.String path) Called internally by AbstractWebConsolePlugin to load resources.
java.lang.Object	getService(java.lang.String serviceName) Gets the service with the specified class name.
java.lang.String	getTitle() Retrieves the title of the plug-in.
SimpleWebConsolePlugin	register(org.osgi.framework.BundleContext bc) This is an utility method.
void	unregister() An utility method that removes the service, registered by the register(BundleContext) method.

Methods inherited from class org.apache.felix.webconsole.AbstractWebConsolePlugin

activate, doGet, endResponse, getBrandingPlugin, getBundle, getBundleContext, getParameter, getResourceProvider, getServletName, isHtmlRequest, log, log, readTemplateFile, renderContent, renderTopNavigation, sendRedirect, setBrandingPlugin, setLogLevel, startResponse

Methods inherited from class javax.servlet.http.HttpServlet

doDelete, doHead, doOptions, doPost, doPut, doTrace, getLastModified, service, service

Methods inherited from class javax.servlet.GenericServlet

destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, init, init, log, log

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SimpleWebConsolePlugin

public SimpleWebConsolePlugin(java.lang.String label,
                              java.lang.String title,
                              java.lang.String[] css)

Creates new Simple Web Console Plugin.

Parameters:

label - the front label. See AbstractWebConsolePlugin.getLabel()

title - the plugin title . See AbstractWebConsolePlugin.getTitle()

css - the additional plugin CSS. See AbstractWebConsolePlugin.getCssReferences()

Method Detail

getLabel

public final java.lang.String getLabel()

Description copied from class: AbstractWebConsolePlugin

Retrieves the label. This is the last component in the servlet path. This method MUST be overridden, if the AbstractWebConsolePlugin.AbstractWebConsolePlugin() constructor is used.

Specified by:

getLabel in class AbstractWebConsolePlugin

Returns:

the label.

See Also:

AbstractWebConsolePlugin.getLabel()

getTitle

public final java.lang.String getTitle()

Description copied from class: AbstractWebConsolePlugin

Retrieves the title of the plug-in. It is displayed in the page header and is also included in the title of the HTML document. This method MUST be overridden, if the AbstractWebConsolePlugin.AbstractWebConsolePlugin() constructor is used.

Specified by:

getTitle in class AbstractWebConsolePlugin

Returns:

the plugin title.

See Also:

AbstractWebConsolePlugin.getTitle()

getCssReferences

protected final java.lang.String[] getCssReferences()

Description copied from class: AbstractWebConsolePlugin

Returns a list of CSS reference paths or null if no additional CSS files are provided by the plugin.

The result is an array of strings which are used as the value of the href attribute of the <link> elements placed in the head section of the HTML generated. If the reference is a relative path, it is turned into an absolute path by prepending the value of the WebConsoleConstants.ATTR_APP_ROOT request attribute.

Overrides:

getCssReferences in class AbstractWebConsolePlugin

Returns:

The list of additional CSS files to reference in the head section or null if no such CSS files are required.

See Also:

AbstractWebConsolePlugin.getCssReferences()

getResource

protected java.net.URL getResource(java.lang.String path)

Called internally by AbstractWebConsolePlugin to load resources. This particular implementation depends on the label. As example, if the plugin is accessed as /system/console/abc, and the plugin resources are accessed like /system/console/abc/res/logo.gif, the code here will try load resource /res/logo.gif from the bundle, providing the plugin.

Parameters:

path - the path to read.

Returns:

the URL of the resource or null if not found.

register

public final SimpleWebConsolePlugin register(org.osgi.framework.BundleContext bc)

This is an utility method. It is used to register the plugin service. Don't forget to call the unregister() when the plugin is no longer needed.

Parameters:

bc - the bundle context used for service registration.

Returns:

self

unregister

public final void unregister()

An utility method that removes the service, registered by the register(BundleContext) method.

getService

public final java.lang.Object getService(java.lang.String serviceName)

Gets the service with the specified class name. Will create a new ServiceTracker if the service is not already got.

Parameters:

serviceName - the service name to obtain

Returns:

the service or null if missing.

deactivate

public void deactivate()

This method will close all service trackers, created by getService(String) method. If you override this method, don't forget to call the super.

Overrides:

deactivate in class AbstractWebConsolePlugin

See Also:

AbstractWebConsolePlugin.deactivate()