org.apache.felix.webconsole

Class AbstractWebConsolePlugin

java.lang.Object

javax.servlet.GenericServlet

javax.servlet.http.HttpServlet

org.apache.felix.webconsole.AbstractWebConsolePlugin

All Implemented Interfaces:

java.io.Serializable, Servlet, ServletConfig

Direct Known Subclasses:

SimpleWebConsolePlugin

public abstract class AbstractWebConsolePlugin
extends HttpServlet

The Web Console can be extended by registering an OSGi service for the interface Servlet with the service property felix.webconsole.label set to the label (last segment in the URL) of the page. The respective service is called a Web Console Plugin or a plugin for short. To help rendering the response the Apache Felix Web Console bundle provides two options. One of the options is to extend the AbstractWebConsolePlugin overwriting the renderContent(HttpServletRequest, HttpServletResponse) method.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static java.lang.String	ATTR_FILEUPLOAD The name of the request attribute containing the map of FileItems from the POST request
static java.lang.String	ATTR_FILEUPLOAD_REPO The name of the request attribute containing a File - upload repository path used by DiskFileItemFactory.
static java.lang.String	GET_RESOURCE_METHOD_NAME Web Console Plugin typically consists of servlet and resources such as images, scripts or style sheets.

Constructor Summary

Constructors

Constructor and Description
AbstractWebConsolePlugin()

Method Summary

Modifier and Type	Method and Description
void	activate(BundleContext bundleContext) This method is called from the Felix Web Console to ensure the AbstractWebConsolePlugin is correctly setup.
void	deactivate() This method is called, by the Web Console to de-activate the plugin and release all used resources.
static BrandingPlugin	getBrandingPlugin() Returns the BrandingPlugin currently used for web console branding.
Bundle	getBundle() Returns the Bundle pertaining to the bundle context with which this plugin has been activated.
java.lang.String	getCategory() This method should return category string which will be used to render the plugin in the navigation menu.
abstract java.lang.String	getLabel() Retrieves the label.
static java.lang.String	getParameter(HttpServletRequest request, java.lang.String name) Deprecated. use WebConsoleUtil.getParameter(HttpServletRequest, String)
java.lang.String	getServletName() Returns the title for this plugin as returned by getTitle()
abstract java.lang.String	getTitle() Retrieves the title of the plug-in.
void	log(int level, java.lang.String message) Calls the ServletContext.log(String) method if the configured log level is less than or equal to the given level.
void	log(int level, java.lang.String message, java.lang.Throwable t) Calls the ServletContext.log(String, Throwable) method if the configured log level is less than or equal to the given level.
static void	setBrandingPlugin(BrandingPlugin brandingPlugin) Sets the BrandingPlugin to use globally by all extensions of this class for branding.
static void	setLogLevel(int logLevel) Sets the log level to be applied for calls to the log(int, String) and log(int, String, Throwable) methods.

Methods inherited from class javax.servlet.http.HttpServlet

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

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

Field Detail

ATTR_FILEUPLOAD

public static final java.lang.String ATTR_FILEUPLOAD

The name of the request attribute containing the map of FileItems from the POST request

See Also:

Constant Field Values

ATTR_FILEUPLOAD_REPO

public static final java.lang.String ATTR_FILEUPLOAD_REPO

The name of the request attribute containing a File - upload repository path used by DiskFileItemFactory.

The Web Console plugin, that utilizes file upload capabilities of the web console SHOULD:

1. Obtain the file using BundleContext.getDataFile(String)
2. Set the file as request attribute
3. Use WebConsoleUtil.getParameter(HttpServletRequest, String) to obtain the file(s)

Without setting this attribute, your plugin will not work if there is a security manager enabled. It is guaranteed, that your plugin has permissions to read/write/delete files to the location, provided by the bundle context.

See Also:

Constant Field Values

GET_RESOURCE_METHOD_NAME

public static final java.lang.String GET_RESOURCE_METHOD_NAME

Web Console Plugin typically consists of servlet and resources such as images, scripts or style sheets. To load resources, a Resource Provider is used. The resource provider is an object, that provides a method which name is specified by this constants and it is 'getResource'.

See Also:

getResourceProvider(), Constant Field Values

Constructor Detail

AbstractWebConsolePlugin

public AbstractWebConsolePlugin()

Method Detail

getServletName

public java.lang.String getServletName()

Returns the title for this plugin as returned by getTitle()

Specified by:

getServletName in interface ServletConfig

Overrides:

getServletName in class GenericServlet

See Also:

GenericServlet.getServletName()

getCategory

public java.lang.String getCategory()

This method should return category string which will be used to render the plugin in the navigation menu. Default implementation returns null, which will result in the plugin link rendered as top level menu item. Concrete implementations wishing to be rendered as a sub-menu item under a category should override this method and return a string or define felix.webconsole.category OSGi property. Currently only single level categories are supported. So, this should be a simple String.

Returns:

category

activate

public void activate(BundleContext bundleContext)

This method is called from the Felix Web Console to ensure the AbstractWebConsolePlugin is correctly setup. It is called right after the Web Console receives notification for plugin registration.

Parameters:

bundleContext - the context of the plugin bundle

deactivate

public void deactivate()

This method is called, by the Web Console to de-activate the plugin and release all used resources.

getLabel

public abstract java.lang.String getLabel()

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

Returns:

the label.

getTitle

public abstract java.lang.String getTitle()

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() constructor is used.

Returns:

the plugin title.

getBundle

public final Bundle getBundle()

Returns the Bundle pertaining to the bundle context with which this plugin has been activated. If the plugin has not be activated by calling the activate(BundleContext) method, this method returns null.

Returns:

the bundle or null if the plugin is not activated.

log

public void log(int level,
                java.lang.String message)

Calls the ServletContext.log(String) method if the configured log level is less than or equal to the given level.

Note, that the level paramter is only used to decide whether the GenericServlet.log(String) method is called or not. The actual implementation of the GenericServlet.log method is outside of the control of this method.

If the servlet has not been initialized yet or has already been destroyed the message is printed to stderr.

Parameters:

level - The log level at which to log the message

message - The message to log

log

public void log(int level,
                java.lang.String message,
                java.lang.Throwable t)

Calls the ServletContext.log(String, Throwable) method if the configured log level is less than or equal to the given level.

Note, that the level paramter is only used to decide whether the GenericServlet.log(String, Throwable) method is called or not. The actual implementation of the GenericServlet.log method is outside of the control of this method.

Parameters:

level - The log level at which to log the message

message - The message to log

t - The Throwable to log with the message

getParameter

public static final java.lang.String getParameter(HttpServletRequest request,
                                                  java.lang.String name)

Deprecated. use WebConsoleUtil.getParameter(HttpServletRequest, String)

An utility method, that is used to filter out simple parameter from file parameter when multipart transfer encoding is used. This method processes the request and sets a request attribute ATTR_FILEUPLOAD. The attribute value is a Map where the key is a String specifying the field name and the value is a FileItem.

Parameters:

request - the HTTP request coming from the user

name - the name of the parameter

Returns:

if not multipart transfer encoding is used - the value is the parameter value or null if not set. If multipart is used, and the specified parameter is field - then the value of the parameter is returned.

getBrandingPlugin

public static BrandingPlugin getBrandingPlugin()

Returns the BrandingPlugin currently used for web console branding.

Returns:

the brandingPlugin

setBrandingPlugin

public static final void setBrandingPlugin(BrandingPlugin brandingPlugin)

Sets the BrandingPlugin to use globally by all extensions of this class for branding.

Note: This method is intended to be used internally by the Web Console to update the branding plugin to use.

Parameters:

brandingPlugin - the brandingPlugin to set

setLogLevel

public static final void setLogLevel(int logLevel)

Sets the log level to be applied for calls to the log(int, String) and log(int, String, Throwable) methods.

Note: This method is intended to be used internally by the Web Console to update the log level according to the Web Console configuration.

Parameters:

logLevel - the maximum allowed log level. If message is logged with lower level it will not be forwarded to the logger.