org.apache.myfaces.tomahawk.util.ExternalContextUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of tomahawk21 Show documentation
Show all versions of tomahawk21 Show documentation
JSF components and utilities that can be used with any JSF implementation.
This library is based on the JSF1.1 version of Tomahawk, but with minor source code and build
changes to take advantage of JSF2.1 features. A JSF2.1 implementation is required to use this
version of the Tomahawk library.
The newest version!
/*
* 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.myfaces.tomahawk.util;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Method;
import javax.faces.context.ExternalContext;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
/**
* TODO: This class is a copy of
* org.apache.myfaces.commons.util.ExternalContextUtils
*
* Since tomahawk should be compatible with 1.1, this is placed
* here and there is not a dependency for myfaces-commons-utils, because
* this stuff only works for 1.2
*
* This provides some functionality for determining some things about the
* native request object that is not provided by JSF. This class is useful
* for use in places where Portlet API's may or may not be present and can
* also provide access to some request-specific items which are not available on
* the JSF ExternalContext. If portlet API's are not present, this class simply
* handles the Servlet Request type.
*
* @since 1.1.7
*/
public final class ExternalContextUtils
{
// prevent this from being instantiated
private ExternalContextUtils()
{
}
/**
* Returns the content length or -1 if the unknown.
*
* @param externalContext
* the ExternalContext
* @return the length or -1
*/
public static final int getContentLength(ExternalContext externalContext)
{
RequestType type = getRequestType(externalContext);
if(type.isRequestFromClient())
{
try
{
Object request = externalContext.getRequest();
Method contentLenMethod = request.getClass().getMethod("getContentLength",new Class[]{});
return ((Integer) contentLenMethod.invoke(request,new Object[]{})).intValue(); //this will autobox
}
catch(Exception e)
{
_LOG.error("Unsupported request type.", e);
}
}
return -1;
}
/**
* Returns the request input stream if one is available
*
* @param externalContext
* @return
* @throws IOException
*/
public static final InputStream getRequestInputStream(ExternalContext externalContext)
throws IOException
{
RequestType type = getRequestType(externalContext);
if(type.isRequestFromClient())
{
try
{
Object request = externalContext.getRequest();
Method method = request.getClass().getMethod(type.isPortlet()?"getPortletInputStream":"getInputStream",new Class[]{});
return (InputStream) method.invoke(request,new Object[]{});
}
catch (Exception e)
{
_LOG.error("Unable to get the request input stream because of an error", e);
}
}
return null;
}
/**
* Returns the requestType of this ExternalContext.
*
* @param externalContext the current external context
* @return the appropriate RequestType for this external context
* @see RequestType
*/
public static final RequestType getRequestType(ExternalContext externalContext)
{
//Stuff is laid out strangely in this class in order to optimize
//performance. We want to do as few instanceof's as possible so
//things are laid out according to the expected frequency of the
//various requests occurring.
if(_PORTLET_CONTEXT_CLASS != null)
{
if (_PORTLET_CONTEXT_CLASS.isInstance(externalContext.getContext()))
{
//We are inside of a portlet container
Object request = externalContext.getRequest();
if(_PORTLET_RENDER_REQUEST_CLASS.isInstance(request))
{
return RequestType.RENDER;
}
if(_PORTLET_RESOURCE_REQUEST_CLASS != null)
{
if(_PORTLET_ACTION_REQUEST_CLASS.isInstance(request))
{
return RequestType.ACTION;
}
//We are in a JSR-286 container
if(_PORTLET_RESOURCE_REQUEST_CLASS.isInstance(request))
{
return RequestType.RESOURCE;
}
return RequestType.EVENT;
}
return RequestType.ACTION;
}
}
return RequestType.SERVLET;
}
/**
* This method is used when a ExternalContext object is not available,
* like in TomahawkFacesContextFactory.
*
* According to TOMAHAWK-1331, the object context could receive an
* instance of javax.portlet.PortletContext or javax.portlet.PortletConfig,
* so we check both cases.
*
* @param context
* @param request
* @return
*/
public static final RequestType getRequestType(Object context, Object request)
{
//Stuff is laid out strangely in this class in order to optimize
//performance. We want to do as few instanceof's as possible so
//things are laid out according to the expected frequency of the
//various requests occurring.
if(_PORTLET_CONTEXT_CLASS != null)
{
if (_PORTLET_CONFIG_CLASS.isInstance(context) ||
_PORTLET_CONTEXT_CLASS.isInstance(context))
{
//We are inside of a portlet container
if(_PORTLET_RENDER_REQUEST_CLASS.isInstance(request))
{
return RequestType.RENDER;
}
if(_PORTLET_RESOURCE_REQUEST_CLASS != null)
{
if(_PORTLET_ACTION_REQUEST_CLASS.isInstance(request))
{
return RequestType.ACTION;
}
//We are in a JSR-286 container
if(_PORTLET_RESOURCE_REQUEST_CLASS.isInstance(request))
{
return RequestType.RESOURCE;
}
return RequestType.EVENT;
}
return RequestType.ACTION;
}
}
return RequestType.SERVLET;
}
private static final Log _LOG = LogFactory.getLog(ExternalContextUtils.class);
private static final Class _PORTLET_ACTION_REQUEST_CLASS;
private static final Class _PORTLET_RENDER_REQUEST_CLASS;
private static final Class _PORTLET_RESOURCE_REQUEST_CLASS; //Will be present in JSR-286 containers only
private static final Class _PORTLET_CONTEXT_CLASS;
private static final Class _PORTLET_CONFIG_CLASS;
static
{
Class context;
Class config;
Class actionRequest;
Class renderRequest;
Class resourceRequest;
try
{
ClassLoader loader = Thread.currentThread().getContextClassLoader();
context = loader.loadClass("javax.portlet.PortletContext");
config = loader.loadClass("javax.portlet.PortletConfig");
actionRequest = loader.loadClass("javax.portlet.ActionRequest");
renderRequest = loader.loadClass("javax.portlet.RenderRequest");
try
{
resourceRequest = loader.loadClass("javax.portlet.ResourceRequest");
}
catch (ClassNotFoundException e)
{
resourceRequest = null;
}
}
catch (ClassNotFoundException e)
{
context = null;
config = null;
actionRequest = null;
renderRequest = null;
resourceRequest = null;
}
_PORTLET_CONTEXT_CLASS = context;
_PORTLET_CONFIG_CLASS = config;
_PORTLET_ACTION_REQUEST_CLASS = actionRequest;
_PORTLET_RENDER_REQUEST_CLASS = renderRequest;
_PORTLET_RESOURCE_REQUEST_CLASS = resourceRequest;
}
}