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/*******************************************************************************
* Copyright (c) 2005, 2011 Cognos Incorporated, IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Cognos Incorporated - initial API and implementation
* IBM Corporation - bug fixes and enhancements
*******************************************************************************/
package org.eclipse.equinox.http.servlet.internal;
import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.*;
import java.net.URL;
import java.security.*;
import java.util.*;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletContext;
import org.osgi.service.http.HttpContext;
public class ServletContextAdaptor {
private final static Map contextToHandlerMethods;
static {
contextToHandlerMethods = createContextToHandlerMethods();
}
private static Map createContextToHandlerMethods() {
Map methods = new HashMap();
Method[] handlerMethods = ServletContextAdaptor.class.getDeclaredMethods();
for (int i = 0; i < handlerMethods.length; i++) {
Method handlerMethod = handlerMethods[i];
String name = handlerMethod.getName();
Class[] parameterTypes = handlerMethod.getParameterTypes();
try {
Method method = ServletContext.class.getMethod(name, parameterTypes);
methods.put(method, handlerMethod);
} catch (NoSuchMethodException e) {
// do nothing
}
}
return methods;
}
final private ServletContext servletContext;
final HttpContext httpContext;
final private AccessControlContext acc;
final private ProxyContext proxyContext;
public ServletContextAdaptor(ProxyContext proxyContext, ServletContext servletContext, HttpContext httpContext, AccessControlContext acc) {
this.servletContext = servletContext;
this.httpContext = httpContext;
this.acc = acc;
this.proxyContext = proxyContext;
}
public ServletContext createServletContext() {
Class clazz = getClass();
ClassLoader classLoader = clazz.getClassLoader();
Class[] interfaces = new Class[] {ServletContext.class};
InvocationHandler invocationHandler = createInvocationHandler();
return (ServletContext) Proxy.newProxyInstance(classLoader, interfaces, invocationHandler);
}
private InvocationHandler createInvocationHandler() {
return new InvocationHandler() {
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
return ServletContextAdaptor.this.invoke(proxy, method, args);
}
};
}
Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
Method m = (Method) contextToHandlerMethods.get(method);
if (m != null) {
return m.invoke(this, args);
}
return method.invoke(servletContext, args);
}
/**
* @see javax.servlet.ServletContext#getResourcePaths(java.lang.String)
*
* This method was added in the Servlet 2.3 API however the OSGi HttpService currently does not provide
* support for this method in the HttpContext interface. To support "getResourcePaths(...) this
* implementation uses reflection to check for and then call the associated HttpContext.getResourcePaths(...)
* method opportunistically. Null is returned if the method is not present or fails.
*/
public Set getResourcePaths(String name) {
if (name == null || !name.startsWith("/")) //$NON-NLS-1$
return null;
try {
Method getResourcePathsMethod = httpContext.getClass().getMethod("getResourcePaths", new Class[] {String.class}); //$NON-NLS-1$
if (!getResourcePathsMethod.isAccessible())
getResourcePathsMethod.setAccessible(true);
return (Set) getResourcePathsMethod.invoke(httpContext, new Object[] {name});
} catch (Exception e) {
// ignore
}
return null;
}
public Object getAttribute(String attributeName) {
Dictionary attributes = proxyContext.getContextAttributes(httpContext);
return attributes.get(attributeName);
}
public Enumeration getAttributeNames() {
Dictionary attributes = proxyContext.getContextAttributes(httpContext);
return attributes.keys();
}
public void setAttribute(String attributeName, Object attributeValue) {
Dictionary attributes = proxyContext.getContextAttributes(httpContext);
attributes.put(attributeName, attributeValue);
}
public void removeAttribute(String attributeName) {
Dictionary attributes = proxyContext.getContextAttributes(httpContext);
attributes.remove(attributeName);
}
public String getMimeType(String name) {
String mimeType = httpContext.getMimeType(name);
return (mimeType != null) ? mimeType : servletContext.getMimeType(name);
}
public URL getResource(final String name) {
try {
return (URL) AccessController.doPrivileged(new PrivilegedExceptionAction() {
public Object run() throws Exception {
return httpContext.getResource(name);
}
}, acc);
} catch (PrivilegedActionException e) {
servletContext.log(e.getException().getMessage(), e.getException());
}
return null;
}
public InputStream getResourceAsStream(String name) {
URL url = getResource(name);
if (url != null) {
try {
return url.openStream();
} catch (IOException e) {
servletContext.log("Error opening stream for resource '" + name + "'", e); //$NON-NLS-1$ //$NON-NLS-2$
}
}
return null;
}
public RequestDispatcher getNamedDispatcher(String arg0) {
return new RequestDispatcherAdaptor(servletContext.getNamedDispatcher(arg0));
}
public RequestDispatcher getRequestDispatcher(String arg0) {
return new RequestDispatcherAdaptor(servletContext.getRequestDispatcher(proxyContext.getServletPath() + arg0));
}
}
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