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/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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.jasper.runtime;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.NoSuchElementException;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.ServletException;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.JspFactory;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.tagext.BodyContent;
import javax.servlet.jsp.JspException;
import org.apache.jasper.Constants;
import org.apache.jasper.logging.Logger;
/**
* Implementation of the PageContext class from the JSP spec.
*
* @author Anil K. Vijendran
* @author Larry Cable
* @author Hans Bergsten
* @author Pierre Delisle
*/
public class PageContextImpl extends PageContext {
Logger.Helper loghelper = new Logger.Helper("JASPER_LOG", "PageContextImpl");
PageContextImpl(JspFactory factory) {
this.factory = factory;
}
public void initialize(Servlet servlet, ServletRequest request,
ServletResponse response, String errorPageURL,
boolean needsSession, int bufferSize,
boolean autoFlush)
throws IOException, IllegalStateException, IllegalArgumentException
{
_initialize(servlet, request, response, errorPageURL, needsSession, bufferSize, autoFlush);
}
void _initialize(Servlet servlet, ServletRequest request,
ServletResponse response, String errorPageURL,
boolean needsSession, int bufferSize,
boolean autoFlush)
throws IOException, IllegalStateException, IllegalArgumentException
{
// initialize state
this.servlet = servlet;
this.config = servlet.getServletConfig();
this.context = config.getServletContext();
this.needsSession = needsSession;
this.errorPageURL = errorPageURL;
this.bufferSize = bufferSize;
this.autoFlush = autoFlush;
this.request = request;
this.response = response;
// setup session (if required)
if (request instanceof HttpServletRequest && needsSession)
this.session = ((HttpServletRequest)request).getSession();
if (needsSession && session == null)
throw new IllegalStateException
("Page needs a session and none is available");
// initialize the initial out ...
depth = -1;
if (this.baseOut == null) {
this.baseOut = _createOut(bufferSize, autoFlush);
} else {
this.baseOut.init(response, bufferSize, autoFlush);
}
this.out = baseOut;
if (this.out == null)
throw new IllegalStateException("failed initialize JspWriter");
// register names/values as per spec
setAttribute(OUT, this.out);
setAttribute(REQUEST, request);
setAttribute(RESPONSE, response);
if (session != null)
setAttribute(SESSION, session);
setAttribute(PAGE, servlet);
setAttribute(CONFIG, config);
setAttribute(PAGECONTEXT, this);
setAttribute(APPLICATION, context);
isIncluded = request.getAttribute(
"javax.servlet.include.servlet_path") != null;
}
public void release() {
out = baseOut;
try {
if (isIncluded) {
((JspWriterImpl)out).flushBuffer();
// push it into the including jspWriter
} else {
// Do not flush the buffer even if we're not included (i.e.
// we are the main page. The servlet will flush it and close
// the stream.
((JspWriterImpl)out).flushBuffer();
}
} catch (IOException ex) {
loghelper.log("Internal error flushing the buffer in release()");
}
servlet = null;
config = null;
context = null;
needsSession = false;
errorPageURL = null;
bufferSize = JspWriter.DEFAULT_BUFFER;
autoFlush = true;
request = null;
response = null;
depth = -1;
baseOut.recycle();
session = null;
attributes.clear();
}
public Object getAttribute(String name) {
return attributes.get(name);
}
public Object getAttribute(String name, int scope) {
switch (scope) {
case PAGE_SCOPE:
return attributes.get(name);
case REQUEST_SCOPE:
return request.getAttribute(name);
case SESSION_SCOPE:
if (session == null)
throw new IllegalArgumentException("can't access SESSION_SCOPE without an HttpSession");
else
return session.getAttribute(name);
case APPLICATION_SCOPE:
return context.getAttribute(name);
default:
throw new IllegalArgumentException("unidentified scope");
}
}
public void setAttribute(String name, Object attribute) {
setAttribute(name, attribute, PAGE_SCOPE);
}
public void setAttribute(String name, Object o, int scope) {
if (name == null) {
throw new NullPointerException("name may not be null");
}
if (o == null) {
throw new NullPointerException("object may not be null");
}
switch (scope) {
case PAGE_SCOPE:
attributes.put(name, o);
break;
case REQUEST_SCOPE:
request.setAttribute(name, o);
break;
case SESSION_SCOPE:
if (session == null)
throw new IllegalArgumentException
("can't access SESSION_SCOPE without an HttpSession");
else
session.setAttribute(name, o);
break;
case APPLICATION_SCOPE:
context.setAttribute(name, o);
break;
default:
}
}
public void removeAttribute(String name, int scope) {
switch (scope) {
case PAGE_SCOPE:
attributes.remove(name);
break;
case REQUEST_SCOPE:
request.removeAttribute(name);
break;
case SESSION_SCOPE:
if (session == null)
throw new IllegalArgumentException("can't access SESSION_SCOPE without an HttpSession");
else
session.removeAttribute(name);
// was:
// session.removeValue(name);
// REVISIT Verify this is correct - akv
break;
case APPLICATION_SCOPE:
context.removeAttribute(name);
break;
default:
}
}
public int getAttributesScope(String name) {
if (attributes.get(name) != null) return PAGE_SCOPE;
if (request.getAttribute(name) != null)
return REQUEST_SCOPE;
if (session != null) {
if (session.getAttribute(name) != null)
return SESSION_SCOPE;
}
if (context.getAttribute(name) != null) return APPLICATION_SCOPE;
return 0;
}
public Object findAttribute(String name) {
Object o = attributes.get(name);
if (o != null)
return o;
o = request.getAttribute(name);
if (o != null)
return o;
if (session != null) {
o = session.getAttribute(name);
if (o != null)
return o;
}
return context.getAttribute(name);
}
public Enumeration getAttributeNamesInScope(int scope) {
switch (scope) {
case PAGE_SCOPE:
return attributes.keys();
case REQUEST_SCOPE:
return request.getAttributeNames();
case SESSION_SCOPE:
if (session != null) {
return session.getAttributeNames();
} else
throw new IllegalArgumentException("can't access SESSION_SCOPE without an HttpSession");
case APPLICATION_SCOPE:
return context.getAttributeNames();
default: return new Enumeration() { // empty enumeration
public boolean hasMoreElements() { return false; }
public Object nextElement() { throw new NoSuchElementException(); }
};
}
}
public void removeAttribute(String name) {
try {
removeAttribute(name, PAGE_SCOPE);
removeAttribute(name, REQUEST_SCOPE);
if(session != null ) {
removeAttribute(name, SESSION_SCOPE);
}
removeAttribute(name, APPLICATION_SCOPE);
} catch (Exception ex) {
// we remove as much as we can, and
// simply ignore possible exceptions
}
}
public JspWriter getOut() {
return out;
}
public HttpSession getSession() { return session; }
public Servlet getServlet() { return servlet; }
public ServletConfig getServletConfig() { return config; }
public ServletContext getServletContext() {
return config.getServletContext();
}
public ServletRequest getRequest() { return request; }
public ServletResponse getResponse() { return response; }
public Exception getException() { return (Exception)request.getAttribute(EXCEPTION); }
public Object getPage() { return servlet; }
private final String getAbsolutePathRelativeToContext(String relativeUrlPath) {
String path = relativeUrlPath;
if (!path.startsWith("/")) {
String uri = (String) request.getAttribute("javax.servlet.include.servlet_path");
if (uri == null)
uri = ((HttpServletRequest) request).getServletPath();
String baseURI = uri.substring(0, uri.lastIndexOf('/'));
path = baseURI+'/'+path;
}
return path;
}
public void include(String relativeUrlPath)
throws ServletException, IOException
{
JspRuntimeLibrary.include((HttpServletRequest) request,
(HttpServletResponse) response,
relativeUrlPath, out, true);
/*
String path = getAbsolutePathRelativeToContext(relativeUrlPath);
context.getRequestDispatcher(path).include(
request, new ServletResponseWrapperInclude(response, out));
*/
}
public void forward(String relativeUrlPath)
throws ServletException, IOException
{
// JSP.4.5 If the buffer was flushed, throw IllegalStateException
try {
out.clear();
} catch (IOException ex) {
throw new IllegalStateException(Constants.getString(
"jsp.error.attempt_to_clear_flushed_buffer"));
}
// Make sure that the response object is not the wrapper for include
while (response instanceof ServletResponseWrapperInclude) {
response = ((ServletResponseWrapperInclude)response).getResponse();
}
String path = getAbsolutePathRelativeToContext(relativeUrlPath);
String includeUri
= (String) request.getAttribute(Constants.INC_SERVLET_PATH);
if (includeUri != null)
request.removeAttribute(Constants.INC_SERVLET_PATH);
try {
context.getRequestDispatcher(path).forward(request, response);
} finally {
if (includeUri != null)
request.setAttribute(Constants.INC_SERVLET_PATH, includeUri);
request.setAttribute(Constants.FORWARD_SEEN, "true");
}
}
protected BodyContent[] outs = new BodyContentImpl[0];
protected int depth = -1;
public BodyContent pushBody() {
depth++;
if (depth >= outs.length) {
BodyContent[] newOuts = new BodyContentImpl[depth + 1];
for (int i = 0; i < outs.length; i++) {
newOuts[i] = outs[i];
}
newOuts[depth] = new BodyContentImpl(out);
outs = newOuts;
}
outs[depth].clearBody();
out = outs[depth];
return outs[depth];
}
public JspWriter popBody() {
depth--;
if (depth >= 0) {
out = outs[depth];
} else {
out = baseOut;
}
return out;
}
public void handlePageException(Exception ex)
throws IOException, ServletException
{
// Should never be called since handleException() called with a
// Throwable in the generated servlet.
handlePageException((Throwable) ex);
}
public void handlePageException(Throwable t)
throws IOException, ServletException
{
if (t == null) throw new NullPointerException("null Throwable");
// set the request attribute with the Throwable.
request.setAttribute("javax.servlet.jsp.jspException", t);
if (errorPageURL != null && !errorPageURL.equals("")) {
// Set request attributes.
// Do not set the javax.servlet.error.exception attribute here
// (instead, set in the generated servlet code for the error page)
// in order to prevent the ErrorReportValve, which is invoked as
// part of forwarding the request to the error page, from
// throwing it if the response has not been committed (the response
// will have been committed if the error page is a JSP page).
request.setAttribute("javax.servlet.error.status_code",
new Integer(HttpServletResponse.SC_INTERNAL_SERVER_ERROR));
request.setAttribute("javax.servlet.error.request_uri",
((HttpServletRequest) request).getRequestURI());
request.setAttribute("javax.servlet.error.servlet_name",
config.getServletName());
try {
forward(errorPageURL);
} catch (IllegalStateException ise) {
include(errorPageURL);
}
// The error page could be inside an include.
Object newException=request.getAttribute("javax.servlet.error.exception");
// t==null means the attribute was not set.
if ( (newException!= null) && (newException==t) ) {
request.removeAttribute("javax.servlet.error.exception");
}
// now clear the error code - to prevent double handling.
request.removeAttribute("javax.servlet.error.status_code");
request.removeAttribute("javax.servlet.error.request_uri");
request.removeAttribute("javax.servlet.error.status_code");
request.removeAttribute("javax.servlet.jsp.jspException");
} else {
// Otherwise throw the exception wrapped inside a ServletException.
// Set the exception as the root cause in the ServletException
// to get a stack trace for the real problem
if (t instanceof IOException) throw (IOException)t;
if (t instanceof ServletException) throw (ServletException)t;
if (t instanceof RuntimeException) throw (RuntimeException)t;
if (t instanceof JspException) {
Throwable rootCause = ((JspException)t).getRootCause();
if (rootCause != null) {
throw new ServletException(t.getClass().getName() + ": " +
t.getMessage(), rootCause);
} else {
throw new ServletException(t);
}
}
throw new ServletException(t);
}
}
protected JspWriterImpl _createOut(int bufferSize, boolean autoFlush)
throws IOException, IllegalArgumentException {
try {
return new JspWriterImpl(response, bufferSize, autoFlush);
} catch( Throwable t ) {
loghelper.log("creating out", t);
return null;
}
}
/*
* fields
*/
// per Servlet state
protected Servlet servlet;
protected ServletConfig config;
protected ServletContext context;
protected JspFactory factory;
protected boolean needsSession;
protected String errorPageURL;
protected boolean autoFlush;
protected int bufferSize;
// page scope attributes
protected transient Hashtable attributes = new Hashtable(16);
// per request state
protected transient ServletRequest request;
protected transient ServletResponse response;
protected transient Object page;
protected transient HttpSession session;
protected boolean isIncluded;
// initial output stream
protected transient JspWriter out;
protected transient JspWriterImpl baseOut;
}
