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PortletContextImpl - JBOSS Portal 2.2 API 英文版文档

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org.jboss.portal.portlet.impl
Class PortletContextImpl

java.lang.Object
  org.jboss.portal.portlet.impl.PortletContextImpl

All Implemented Interfaces:

PortletContext

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public class PortletContextImpl

extends java.lang.Object

implements PortletContext

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Constructor Summary

PortletContextImpl(javax.servlet.ServletContext servletContext)

 

Method Summary
java.lang.Object	getAttribute(java.lang.String s)           Returns the portlet container attribute with the given name, or null if there is no attribute by that name.
java.util.Enumeration	getAttributeNames()           Returns an Enumeration containing the attribute names available within this portlet context, or an emtpy Enumeration if no attributes are available.
java.lang.String	getInitParameter(java.lang.String s)           Returns a String containing the value of the named context-wide initialization parameter, or null if the parameter does not exist.
java.util.Enumeration	getInitParameterNames()           Returns the names of the context initialization parameters as an Enumeration of String objects, or an empty Enumeration if the context has no initialization parameters.
int	getMajorVersion()           Returns the major version of the Portlet API that this portlet container supports.
java.lang.String	getMimeType(java.lang.String s)           Returns the MIME type of the specified file, or null if the MIME type is not known.
int	getMinorVersion()           Returns the minor version of the Portlet API that this portlet container supports.
PortletRequestDispatcher	getNamedDispatcher(java.lang.String name)           Returns a PortletRequestDispatcher object that acts as a wrapper for the named servlet.
java.lang.String	getPortletContextName()           Returns the name of this portlet application correponding to this PortletContext as specified in the web.xml deployment descriptor for this web application by the display-name element.
java.lang.String	getRealPath(java.lang.String s)           Returns a String containing the real path for a given virtual path.
PortletRequestDispatcher	getRequestDispatcher(java.lang.String path)           Returns a PortletRequestDispatcher object that acts as a wrapper for the resource located at the given path.
java.net.URL	getResource(java.lang.String s)           Returns a URL to the resource that is mapped to a specified path.
java.io.InputStream	getResourceAsStream(java.lang.String s)           Returns the resource located at the given path as an InputStream object.
java.util.Set	getResourcePaths(java.lang.String s)           Returns a directory-like listing of all the paths to resources within the web application longest sub-path of which matches the supplied path argument.
java.lang.String	getServerInfo()           Returns the name and version of the portlet container in which the portlet is running.
void	log(java.lang.String s)           Writes the specified message to a portlet log file, usually an event log.
void	log(java.lang.String s, java.lang.Throwable throwable)           Writes an explanatory message and a stack trace for a given Throwable exception to the portlet log file.
void	removeAttribute(java.lang.String s)           Removes the attribute with the given name from the portlet context.
void	setAttribute(java.lang.String s, java.lang.Object o)           Binds an object to a given attribute name in this portlet context.

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

PortletContextImpl

public PortletContextImpl(javax.servlet.ServletContext servletContext)

Method Detail

getServerInfo

public java.lang.String getServerInfo()

Description copied from interface: PortletContext

Returns the name and version of the portlet container in which the portlet is running.

The form of the returned string is containername/versionnumber.

Specified by:

getServerInfo in interface PortletContext

Returns:

the string containing at least name and version number

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getRequestDispatcher

public PortletRequestDispatcher getRequestDispatcher(java.lang.String path)

Description copied from interface: PortletContext

Returns a PortletRequestDispatcher object that acts as a wrapper for the resource located at the given path. A PortletRequestDispatcher object can be used include the resource in a response. The resource can be dynamic or static.

The pathname must begin with a slash ( / ) and is interpreted as relative to the current context root.

This method returns null if the PortletContext cannot return a PortletRequestDispatcher for any reason.

Specified by:

getRequestDispatcher in interface PortletContext

Parameters:

path - a String specifying the pathname to the resource

Returns:

a PortletRequestDispatcher object that acts as a wrapper for the resource at the specified path.

See Also:

PortletRequestDispatcher

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getNamedDispatcher

public PortletRequestDispatcher getNamedDispatcher(java.lang.String name)

Description copied from interface: PortletContext

Returns a PortletRequestDispatcher object that acts as a wrapper for the named servlet.

Servlets (and also JSP pages) may be given names via server administration or via a web application deployment descriptor.

This method returns null if the PortletContext cannot return a PortletRequestDispatcher for any reason.

Specified by:

getNamedDispatcher in interface PortletContext

Parameters:

name - a String specifying the name of a servlet to be wrapped

Returns:

a PortletRequestDispatcher object that acts as a wrapper for the named servlet

See Also:

PortletRequestDispatcher

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getResourceAsStream

public java.io.InputStream getResourceAsStream(java.lang.String s)

Description copied from interface: PortletContext

Returns the resource located at the given path as an InputStream object. The data in the InputStream can be of any type or length. The method returns null if no resource exists at the given path.

In order to access protected resources the path has to be prefixed with /WEB-INF/ (for example /WEB-INF/myportlet/myportlet.jsp). Otherwise, the direct path is used (for example /myportlet/myportlet.jsp).

Specified by:

getResourceAsStream in interface PortletContext

Parameters:

s - the path to the resource

Returns:

the input stream

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getMajorVersion

public int getMajorVersion()

Description copied from interface: PortletContext

Returns the major version of the Portlet API that this portlet container supports.

Specified by:

getMajorVersion in interface PortletContext

Returns:

the major version

See Also:

PortletContext.getMinorVersion()

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getMinorVersion

public int getMinorVersion()

Description copied from interface: PortletContext

Returns the minor version of the Portlet API that this portlet container supports.

Specified by:

getMinorVersion in interface PortletContext

Returns:

the minor version

See Also:

PortletContext.getMajorVersion()

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getMimeType

public java.lang.String getMimeType(java.lang.String s)

Description copied from interface: PortletContext

Returns the MIME type of the specified file, or null if the MIME type is not known. The MIME type is determined by the configuration of the portlet container and may be specified in a web application deployment descriptor. Common MIME types are text/html and image/gif.

Specified by:

getMimeType in interface PortletContext

Parameters:

s - a String specifying the name of a file

Returns:

a String specifying the MIME type of the file

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getRealPath

public java.lang.String getRealPath(java.lang.String s)

Description copied from interface: PortletContext

Returns a String containing the real path for a given virtual path. For example, the path /index.html returns the absolute file path of the portlet container file system.

The real path returned will be in a form appropriate to the computer and operating system on which the portlet container is running, including the proper path separators. This method returns null if the portlet container cannot translate the virtual path to a real path for any reason (such as when the content is being made available from a .war archive).

Specified by:

getRealPath in interface PortletContext

Parameters:

s - a String specifying a virtual path

Returns:

a String specifying the real path, or null if the transformation cannot be performed.

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getResourcePaths

public java.util.Set getResourcePaths(java.lang.String s)

Description copied from interface: PortletContext

Returns a directory-like listing of all the paths to resources within the web application longest sub-path of which matches the supplied path argument. Paths indicating subdirectory paths end with a slash (/). The returned paths are all relative to the root of the web application and have a leading slash. For example, for a web application containing

/welcome.html
/catalog/index.html
/catalog/products.html
/catalog/offers/books.html
/catalog/offers/music.html
/customer/login.jsp
/WEB-INF/web.xml
/WEB-INF/classes/com.acme.OrderPortlet.class,

getResourcePaths("/") returns {"/welcome.html", "/catalog/", "/customer/", "/WEB-INF/"}
getResourcePaths("/catalog/") returns {"/catalog/index.html", "/catalog/products.html", "/catalog/offers/"}.

Specified by:

getResourcePaths in interface PortletContext

Parameters:

s - the partial path used to match the resources, which must start with a slash

Returns:

a Set containing the directory listing, or null if there are no resources in the web application of which the path begins with the supplied path.

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getResource

public java.net.URL getResource(java.lang.String s)
                         throws java.net.MalformedURLException

Description copied from interface: PortletContext

Returns a URL to the resource that is mapped to a specified path. The path must begin with a slash (/) and is interpreted as relative to the current context root.

This method allows the portlet container to make a resource available to portlets from any source. Resources can be located on a local or remote file system, in a database, or in a .war file.

The portlet container must implement the URL handlers and URLConnection objects that are necessary to access the resource.

This method returns null if no resource is mapped to the pathname.

Some containers may allow writing to the URL returned by this method using the methods of the URL class.

The resource content is returned directly, so be aware that requesting a .jsp page returns the JSP source code. Use a RequestDispatcher instead to include results of an execution.

This method has a different purpose than java.lang.Class.getResource, which looks up resources based on a class loader. This method does not use class loaders.

Specified by:

getResource in interface PortletContext

Parameters:

s - a String specifying the path to the resource

Returns:

the resource located at the named path, or null if there is no resource at that path

Throws:

java.net.MalformedURLException - if the pathname is not given in the correct form

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getAttribute

public java.lang.Object getAttribute(java.lang.String s)

Description copied from interface: PortletContext

Returns the portlet container attribute with the given name, or null if there is no attribute by that name. An attribute allows a portlet container to give the portlet additional information not already provided by this interface. A list of supported attributes can be retrieved using getAttributeNames.

The attribute is returned as a java.lang.Object or some subclass. Attribute names should follow the same convention as package names. The Java Portlet API specification reserves names matching java.*, javax.*, and sun.*.

Specified by:

getAttribute in interface PortletContext

Parameters:

s - a String specifying the name of the attribute

Returns:

an Object containing the value of the attribute, or null if no attribute exists matching the given name

See Also:

PortletContext.getAttributeNames()

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getAttributeNames

public java.util.Enumeration getAttributeNames()

Description copied from interface: PortletContext

Returns an Enumeration containing the attribute names available within this portlet context, or an emtpy Enumeration if no attributes are available. Use the PortletContext.getAttribute(java.lang.String) method with an attribute name to get the value of an attribute.

Specified by:

getAttributeNames in interface PortletContext

Returns:

an Enumeration of attribute names

See Also:

PortletContext.getAttribute(java.lang.String)

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getInitParameter

public java.lang.String getInitParameter(java.lang.String s)

Description copied from interface: PortletContext

Returns a String containing the value of the named context-wide initialization parameter, or null if the parameter does not exist. This method provides configuration information which may be useful for an entire "portlet application".

Specified by:

getInitParameter in interface PortletContext

Parameters:

s - a String containing the name of the requested parameter

Returns:

a String containing the value of the initialization parameter, or null if the parameter does not exist.

See Also:

PortletContext.getInitParameterNames()

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getInitParameterNames

public java.util.Enumeration getInitParameterNames()

Description copied from interface: PortletContext

Returns the names of the context initialization parameters as an Enumeration of String objects, or an empty Enumeration if the context has no initialization parameters.

Specified by:

getInitParameterNames in interface PortletContext

Returns:

an Enumeration of String objects containing the names of the context initialization parameters

See Also:

PortletContext.getInitParameter(java.lang.String)

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log

public void log(java.lang.String s)

Description copied from interface: PortletContext

Writes the specified message to a portlet log file, usually an event log. The name and type of the portlet log file is specific to the portlet container.

This method mapps to the ServletContext.log method. The portlet container may in addition log this message in a portlet container specific log file.

Specified by:

log in interface PortletContext

Parameters:

s - a String specifying the message to be written to the log file

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log

public void log(java.lang.String s,
                java.lang.Throwable throwable)

Description copied from interface: PortletContext

Writes an explanatory message and a stack trace for a given Throwable exception to the portlet log file. The name and type of the portlet log file is specific to the portlet container, usually an event log.

This method is mapped to the ServletContext.log method. The portlet container may in addition log this message in a portlet container specific log file.

Specified by:

log in interface PortletContext

Parameters:

s - a String that describes the error or exception

throwable - the Throwable error or exception

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removeAttribute

public void removeAttribute(java.lang.String s)

Description copied from interface: PortletContext

Removes the attribute with the given name from the portlet context. After removal, subsequent calls to PortletContext.getAttribute(java.lang.String) to retrieve the attribute's value will return null.

Specified by:

removeAttribute in interface PortletContext

Parameters:

s - a String specifying the name of the attribute to be removed

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setAttribute

public void setAttribute(java.lang.String s,
                         java.lang.Object o)

Description copied from interface: PortletContext

Binds an object to a given attribute name in this portlet context. If the name specified is already used for an attribute, this method removes the old attribute and binds the name to the new attribute.

If a null value is passed, the effect is the same as calling removeAttribute().

Attribute names should follow the same convention as package names. The Java Portlet API specification reserves names matching java.*, javax.*, and sun.*.

Specified by:

setAttribute in interface PortletContext

Parameters:

s - a String specifying the name of the attribute

o - an Object representing the attribute to be bound

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getPortletContextName

public java.lang.String getPortletContextName()

Description copied from interface: PortletContext

Returns the name of this portlet application correponding to this PortletContext as specified in the web.xml deployment descriptor for this web application by the display-name element.

Specified by:

getPortletContextName in interface PortletContext

Returns:

The name of the web application or null if no name has been declared in the deployment descriptor.

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