Tomcat example source code file (ApplicationHttpRequest.java)
The Tomcat ApplicationHttpRequest.java source code/*
* 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.catalina.core;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
import javax.servlet.http.HttpSession;
import org.apache.catalina.Context;
import org.apache.catalina.Globals;
import org.apache.catalina.Session;
import org.apache.catalina.Manager;
import org.apache.catalina.util.Enumerator;
import org.apache.catalina.util.RequestUtil;
import org.apache.catalina.util.StringManager;
/**
* Wrapper around a <code>javax.servlet.http.HttpServletRequest
* that transforms an application request object (which might be the original
* one passed to a servlet, or might be based on the 2.3
* <code>javax.servlet.http.HttpServletRequestWrapper class)
* back into an internal <code>org.apache.catalina.HttpRequest.
* <p>
* <strong>WARNING: Due to Java's lack of support for multiple
* inheritance, all of the logic in <code>ApplicationRequest is
* duplicated in <code>ApplicationHttpRequest. Make sure that you
* keep these two classes in synchronization when making changes!
*
* @author Craig R. McClanahan
* @author Remy Maucherat
* @version $Revision: 467222 $ $Date: 2006-10-24 05:17:11 +0200 (mar., 24 oct. 2006) $
*/
class ApplicationHttpRequest extends HttpServletRequestWrapper {
// ------------------------------------------------------- Static Variables
/**
* The set of attribute names that are special for request dispatchers.
*/
protected static final String specials[] =
{ Globals.INCLUDE_REQUEST_URI_ATTR, Globals.INCLUDE_CONTEXT_PATH_ATTR,
Globals.INCLUDE_SERVLET_PATH_ATTR, Globals.INCLUDE_PATH_INFO_ATTR,
Globals.INCLUDE_QUERY_STRING_ATTR, Globals.FORWARD_REQUEST_URI_ATTR,
Globals.FORWARD_CONTEXT_PATH_ATTR, Globals.FORWARD_SERVLET_PATH_ATTR,
Globals.FORWARD_PATH_INFO_ATTR, Globals.FORWARD_QUERY_STRING_ATTR };
/**
* The string manager for this package.
*/
protected static StringManager sm =
StringManager.getManager(Constants.Package);
// ----------------------------------------------------------- Constructors
/**
* Construct a new wrapped request around the specified servlet request.
*
* @param request The servlet request being wrapped
*/
public ApplicationHttpRequest(HttpServletRequest request, Context context,
boolean crossContext) {
super(request);
this.context = context;
this.crossContext = crossContext;
setRequest(request);
}
// ----------------------------------------------------- Instance Variables
/**
* The context for this request.
*/
protected Context context = null;
/**
* The context path for this request.
*/
protected String contextPath = null;
/**
* If this request is cross context, since this changes session accesss
* behavior.
*/
protected boolean crossContext = false;
/**
* The current dispatcher type.
*/
protected Object dispatcherType = null;
/**
* Descriptive information about this implementation.
*/
protected static final String info =
"org.apache.catalina.core.ApplicationHttpRequest/1.0";
/**
* The request parameters for this request. This is initialized from the
* wrapped request, but updates are allowed.
*/
protected Map parameters = null;
/**
* Have the parameters for this request already been parsed?
*/
private boolean parsedParams = false;
/**
* The path information for this request.
*/
protected String pathInfo = null;
/**
* The query parameters for the current request.
*/
private String queryParamString = null;
/**
* The query string for this request.
*/
protected String queryString = null;
/**
* The current request dispatcher path.
*/
protected Object requestDispatcherPath = null;
/**
* The request URI for this request.
*/
protected String requestURI = null;
/**
* The servlet path for this request.
*/
protected String servletPath = null;
/**
* The currently active session for this request.
*/
protected Session session = null;
/**
* Special attributes.
*/
protected Object[] specialAttributes = new Object[specials.length];
// ------------------------------------------------- ServletRequest Methods
/**
* Override the <code>getAttribute() method of the wrapped request.
*
* @param name Name of the attribute to retrieve
*/
public Object getAttribute(String name) {
if (name.equals(Globals.DISPATCHER_TYPE_ATTR)) {
return dispatcherType;
} else if (name.equals(Globals.DISPATCHER_REQUEST_PATH_ATTR)) {
if ( requestDispatcherPath != null ){
return requestDispatcherPath.toString();
} else {
return null;
}
}
int pos = getSpecial(name);
if (pos == -1) {
return getRequest().getAttribute(name);
} else {
if ((specialAttributes[pos] == null)
&& (specialAttributes[5] == null) && (pos >= 5)) {
// If it's a forward special attribute, and null, it means this
// is an include, so we check the wrapped request since
// the request could have been forwarded before the include
return getRequest().getAttribute(name);
} else {
return specialAttributes[pos];
}
}
}
/**
* Override the <code>getAttributeNames() method of the wrapped
* request.
*/
public Enumeration getAttributeNames() {
return (new AttributeNamesEnumerator());
}
/**
* Override the <code>removeAttribute() method of the
* wrapped request.
*
* @param name Name of the attribute to remove
*/
public void removeAttribute(String name) {
if (!removeSpecial(name))
getRequest().removeAttribute(name);
}
/**
* Override the <code>setAttribute() method of the
* wrapped request.
*
* @param name Name of the attribute to set
* @param value Value of the attribute to set
*/
public void setAttribute(String name, Object value) {
if (name.equals(Globals.DISPATCHER_TYPE_ATTR)) {
dispatcherType = value;
return;
} else if (name.equals(Globals.DISPATCHER_REQUEST_PATH_ATTR)) {
requestDispatcherPath = value;
return;
}
if (!setSpecial(name, value)) {
getRequest().setAttribute(name, value);
}
}
/**
* Return a RequestDispatcher that wraps the resource at the specified
* path, which may be interpreted as relative to the current request path.
*
* @param path Path of the resource to be wrapped
*/
public RequestDispatcher getRequestDispatcher(String path) {
if (context == null)
return (null);
// If the path is already context-relative, just pass it through
if (path == null)
return (null);
else if (path.startsWith("/"))
return (context.getServletContext().getRequestDispatcher(path));
// Convert a request-relative path to a context-relative one
String servletPath =
(String) getAttribute(Globals.INCLUDE_SERVLET_PATH_ATTR);
if (servletPath == null)
servletPath = getServletPath();
// Add the path info, if there is any
String pathInfo = getPathInfo();
String requestPath = null;
if (pathInfo == null) {
requestPath = servletPath;
} else {
requestPath = servletPath + pathInfo;
}
int pos = requestPath.lastIndexOf('/');
String relative = null;
if (pos >= 0) {
relative = RequestUtil.normalize
(requestPath.substring(0, pos + 1) + path);
} else {
relative = RequestUtil.normalize(requestPath + path);
}
return (context.getServletContext().getRequestDispatcher(relative));
}
// --------------------------------------------- HttpServletRequest Methods
/**
* Override the <code>getContextPath() method of the wrapped
* request.
*/
public String getContextPath() {
return (this.contextPath);
}
/**
* Override the <code>getParameter() method of the wrapped request.
*
* @param name Name of the requested parameter
*/
public String getParameter(String name) {
parseParameters();
Object value = parameters.get(name);
if (value == null)
return (null);
else if (value instanceof String[])
return (((String[]) value)[0]);
else if (value instanceof String)
return ((String) value);
else
return (value.toString());
}
/**
* Override the <code>getParameterMap() method of the
* wrapped request.
*/
public Map getParameterMap() {
parseParameters();
return (parameters);
}
/**
* Override the <code>getParameterNames() method of the
* wrapped request.
*/
public Enumeration getParameterNames() {
parseParameters();
return (new Enumerator(parameters.keySet()));
}
/**
* Override the <code>getParameterValues() method of the
* wrapped request.
*
* @param name Name of the requested parameter
*/
public String[] getParameterValues(String name) {
parseParameters();
Object value = parameters.get(name);
if (value == null)
return ((String[]) null);
else if (value instanceof String[])
return ((String[]) value);
else if (value instanceof String) {
String values[] = new String[1];
values[0] = (String) value;
return (values);
} else {
String values[] = new String[1];
values[0] = value.toString();
return (values);
}
}
/**
* Override the <code>getPathInfo() method of the wrapped request.
*/
public String getPathInfo() {
return (this.pathInfo);
}
/**
* Override the <code>getQueryString() method of the wrapped
* request.
*/
public String getQueryString() {
return (this.queryString);
}
/**
* Override the <code>getRequestURI() method of the wrapped
* request.
*/
public String getRequestURI() {
return (this.requestURI);
}
/**
* Override the <code>getRequestURL() method of the wrapped
* request.
*/
public StringBuffer getRequestURL() {
StringBuffer url = new StringBuffer();
String scheme = getScheme();
int port = getServerPort();
if (port < 0)
port = 80; // Work around java.net.URL bug
url.append(scheme);
url.append("://");
url.append(getServerName());
if ((scheme.equals("http") && (port != 80))
|| (scheme.equals("https") && (port != 443))) {
url.append(':');
url.append(port);
}
url.append(getRequestURI());
return (url);
}
/**
* Override the <code>getServletPath() method of the wrapped
* request.
*/
public String getServletPath() {
return (this.servletPath);
}
/**
* Return the session associated with this Request, creating one
* if necessary.
*/
public HttpSession getSession() {
return (getSession(true));
}
/**
* Return the session associated with this Request, creating one
* if necessary and requested.
*
* @param create Create a new session if one does not exist
*/
public HttpSession getSession(boolean create) {
if (crossContext) {
// There cannot be a session if no context has been assigned yet
if (context == null)
return (null);
// Return the current session if it exists and is valid
if (session != null && session.isValid()) {
return (session.getSession());
}
HttpSession other = super.getSession(false);
if (create && (other == null)) {
// First create a session in the first context: the problem is
// that the top level request is the only one which can
// create the cookie safely
other = super.getSession(true);
}
if (other != null) {
Session localSession = null;
try {
localSession =
context.getManager().findSession(other.getId());
} catch (IOException e) {
// Ignore
}
if (localSession == null && create) {
localSession =
context.getManager().createSession(other.getId());
}
if (localSession != null) {
localSession.access();
session = localSession;
return session.getSession();
}
}
return null;
} else {
return super.getSession(create);
}
}
/**
* Returns true if the request specifies a JSESSIONID that is valid within
* the context of this ApplicationHttpRequest, false otherwise.
*
* @return true if the request specifies a JSESSIONID that is valid within
* the context of this ApplicationHttpRequest, false otherwise.
*/
public boolean isRequestedSessionIdValid() {
if (crossContext) {
String requestedSessionId = getRequestedSessionId();
if (requestedSessionId == null)
return (false);
if (context == null)
return (false);
Manager manager = context.getManager();
if (manager == null)
return (false);
Session session = null;
try {
session = manager.findSession(requestedSessionId);
} catch (IOException e) {
session = null;
}
if ((session != null) && session.isValid()) {
return (true);
} else {
return (false);
}
} else {
return super.isRequestedSessionIdValid();
}
}
// -------------------------------------------------------- Package Methods
/**
* Recycle this request
*/
public void recycle() {
if (session != null) {
session.endAccess();
}
}
/**
* Return descriptive information about this implementation.
*/
public String getInfo() {
return (info);
}
/**
* Perform a shallow copy of the specified Map, and return the result.
*
* @param orig Origin Map to be copied
*/
Map copyMap(Map orig) {
if (orig == null)
return (new HashMap());
HashMap dest = new HashMap();
Iterator keys = orig.keySet().iterator();
while (keys.hasNext()) {
String key = (String) keys.next();
dest.put(key, orig.get(key));
}
return (dest);
}
/**
* Set the context path for this request.
*
* @param contextPath The new context path
*/
void setContextPath(String contextPath) {
this.contextPath = contextPath;
}
/**
* Set the path information for this request.
*
* @param pathInfo The new path info
*/
void setPathInfo(String pathInfo) {
this.pathInfo = pathInfo;
}
/**
* Set the query string for this request.
*
* @param queryString The new query string
*/
void setQueryString(String queryString) {
this.queryString = queryString;
}
/**
* Set the request that we are wrapping.
*
* @param request The new wrapped request
*/
void setRequest(HttpServletRequest request) {
super.setRequest(request);
// Initialize the attributes for this request
dispatcherType = request.getAttribute(Globals.DISPATCHER_TYPE_ATTR);
requestDispatcherPath =
request.getAttribute(Globals.DISPATCHER_REQUEST_PATH_ATTR);
// Initialize the path elements for this request
contextPath = request.getContextPath();
pathInfo = request.getPathInfo();
queryString = request.getQueryString();
requestURI = request.getRequestURI();
servletPath = request.getServletPath();
}
/**
* Set the request URI for this request.
*
* @param requestURI The new request URI
*/
void setRequestURI(String requestURI) {
this.requestURI = requestURI;
}
/**
* Set the servlet path for this request.
*
* @param servletPath The new servlet path
*/
void setServletPath(String servletPath) {
this.servletPath = servletPath;
}
/**
* Parses the parameters of this request.
*
* If parameters are present in both the query string and the request
* content, they are merged.
*/
void parseParameters() {
if (parsedParams) {
return;
}
parameters = new HashMap();
parameters = copyMap(getRequest().getParameterMap());
mergeParameters();
parsedParams = true;
}
/**
* Save query parameters for this request.
*
* @param queryString The query string containing parameters for this
* request
*/
void setQueryParams(String queryString) {
this.queryParamString = queryString;
}
// ------------------------------------------------------ Protected Methods
/**
* Is this attribute name one of the special ones that is added only for
* included servlets?
*
* @param name Attribute name to be tested
*/
protected boolean isSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name))
return (true);
}
return (false);
}
/**
* Get a special attribute.
*
* @return the special attribute pos, or -1 if it is not a special
* attribute
*/
protected int getSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
return (i);
}
}
return (-1);
}
/**
* Set a special attribute.
*
* @return true if the attribute was a special attribute, false otherwise
*/
protected boolean setSpecial(String name, Object value) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
specialAttributes[i] = value;
return (true);
}
}
return (false);
}
/**
* Remove a special attribute.
*
* @return true if the attribute was a special attribute, false otherwise
*/
protected boolean removeSpecial(String name) {
for (int i = 0; i < specials.length; i++) {
if (specials[i].equals(name)) {
specialAttributes[i] = null;
return (true);
}
}
return (false);
}
/**
* Merge the two sets of parameter values into a single String array.
*
* @param values1 First set of values
* @param values2 Second set of values
*/
protected String[] mergeValues(Object values1, Object values2) {
ArrayList results = new ArrayList();
if (values1 == null)
;
else if (values1 instanceof String)
results.add(values1);
else if (values1 instanceof String[]) {
String values[] = (String[]) values1;
for (int i = 0; i < values.length; i++)
results.add(values[i]);
} else
results.add(values1.toString());
if (values2 == null)
;
else if (values2 instanceof String)
results.add(values2);
else if (values2 instanceof String[]) {
String values[] = (String[]) values2;
for (int i = 0; i < values.length; i++)
results.add(values[i]);
} else
results.add(values2.toString());
String values[] = new String[results.size()];
return ((String[]) results.toArray(values));
}
// ------------------------------------------------------ Private Methods
/**
* Merge the parameters from the saved query parameter string (if any), and
* the parameters already present on this request (if any), such that the
* parameter values from the query string show up first if there are
* duplicate parameter names.
*/
private void mergeParameters() {
if ((queryParamString == null) || (queryParamString.length() < 1))
return;
HashMap queryParameters = new HashMap();
String encoding = getCharacterEncoding();
if (encoding == null)
encoding = "ISO-8859-1";
try {
RequestUtil.parseParameters
(queryParameters, queryParamString, encoding);
} catch (Exception e) {
;
}
Iterator keys = parameters.keySet().iterator();
while (keys.hasNext()) {
String key = (String) keys.next();
Object value = queryParameters.get(key);
if (value == null) {
queryParameters.put(key, parameters.get(key));
continue;
}
queryParameters.put
(key, mergeValues(value, parameters.get(key)));
}
parameters = queryParameters;
}
// ----------------------------------- AttributeNamesEnumerator Inner Class
/**
* Utility class used to expose the special attributes as being available
* as request attributes.
*/
protected class AttributeNamesEnumerator implements Enumeration {
protected int pos = -1;
protected int last = -1;
protected Enumeration parentEnumeration = null;
protected String next = null;
public AttributeNamesEnumerator() {
parentEnumeration = getRequest().getAttributeNames();
for (int i = 0; i < specialAttributes.length; i++) {
if (getAttribute(specials[i]) != null) {
last = i;
}
}
}
public boolean hasMoreElements() {
return ((pos != last) || (next != null)
|| ((next = findNext()) != null));
}
public Object nextElement() {
if (pos != last) {
for (int i = pos + 1; i <= last; i++) {
if (getAttribute(specials[i]) != null) {
pos = i;
return (specials[i]);
}
}
}
String result = next;
if (next != null) {
next = findNext();
} else {
throw new NoSuchElementException();
}
return result;
}
protected String findNext() {
String result = null;
while ((result == null) && (parentEnumeration.hasMoreElements())) {
String current = (String) parentEnumeration.nextElement();
if (!isSpecial(current)) {
result = current;
}
}
return result;
}
}
}
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