org.simpleframework.http.RequestWrapper Maven / Gradle / Ivy
/*
* RequestWrapper.java February 2001
*
* Copyright (C) 2001, Niall Gallagher
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307 USA
*/
package org.simpleframework.http;
import java.io.IOException;
import java.io.InputStream;
import java.net.InetSocketAddress;
import java.nio.channels.ReadableByteChannel;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import org.simpleframework.http.session.Session;
/**
* The RequestWrapper object is used so that the original
* Request object can be wrapped in a filtering proxy
* object. This allows a Container that interacts with
* a modified request object. To add functionality to the request it
* can be wrapped in a subclass of this and the overridden methods
* can provide modified functionality to the standard request.
*
* @author Niall Gallagher
*/
public class RequestWrapper implements Request {
/**
* This is the request instance that is being wrapped.
*/
protected Request request;
/**
* Constructor for RequestWrapper object. This allows
* the original Request object to be wrapped so that
* adjustments to the behavior of a request object handed to the
* container can be provided by a subclass implementation.
*
* @param request the request object that is being wrapped
*/
public RequestWrapper(Request request){
this.request = request;
}
/**
* This can be used to get the major number from a HTTP version.
* The major version corresponds to the major type that is the 1
* of a HTTP/1.0 version string.
*
* @return the major version number for the request message
*/
public int getMajor() {
return request.getMajor();
}
/**
* This can be used to get the major number from a HTTP version.
* The major version corresponds to the major type that is the 0
* of a HTTP/1.0 version string. This is used to determine if
* the request message has keep alive semantics.
*
* @return the major version number for the request message
*/
public int getMinor() {
return request.getMinor();
}
/**
* This can be used to get the HTTP method for this request. The
* HTTP specification RFC 2616 specifies the HTTP request methods
* in section 9, Method Definitions. Typically this will be a
* GET, POST or a HEAD method, although any string is possible.
*
* @return the request method for this request message
*/
public String getMethod() {
return request.getMethod();
}
/**
* This can be used to get the URI specified for this HTTP request.
* This corresponds to the either the full HTTP URI or the path
* part of the URI depending on how the client sends the request.
*
* @return the URI address that this HTTP request is targeting
*/
public String getTarget() {
return request.getTarget();
}
/**
* This is used to acquire the address from the request line.
* An address is the full URI including the scheme, domain, port
* and the query parts. This allows various parameters to be
* acquired without having to parse the raw request target URI.
*
* @return this returns the address of the request line
*/
public Address getAddress() {
return request.getAddress();
}
/**
* This is used to acquire the path as extracted from the HTTP
* request URI. The Path object that is provided by
* this method is immutable, it represents the normalized path
* only part from the request uniform resource identifier.
*
* @return this returns the normalized path for the request
*/
public Path getPath() {
return request.getPath();
}
/**
* This method is used to acquire the query part from the
* HTTP request URI target. This will return only the values
* that have been extracted from the request URI target.
*
* @return the query associated with the HTTP target URI
*/
public Query getQuery() {
return request.getQuery();
}
/**
* This method is used to get a List of the names
* for the headers. This will provide the original names for the
* HTTP headers for the message. Modifications to the provided
* list will not affect the header, the list is a simple copy.
*
* @return this returns a list of the names within the header
*/
public List getNames() {
return request.getNames();
}
/**
* This can be used to get the integer of the first message header
* that has the specified name. This is a convenience method that
* avoids having to deal with parsing the value of the requested
* HTTP message header. This returns -1 if theres no HTTP header
* value for the specified name.
*
* @param name the HTTP message header to get the value from
*
* @return this returns the date as a long from the header value
*/
public int getInteger(String name) {
return request.getInteger(name);
}
/**
* This can be used to get the date of the first message header
* that has the specified name. This is a convenience method that
* avoids having to deal with parsing the value of the requested
* HTTP message header. This returns -1 if theres no HTTP header
* value for the specified name.
*
* @param name the HTTP message header to get the value from
*
* @return this returns the date as a long from the header value
*/
public long getDate(String name) {
return request.getDate(name);
}
/**
* This is used to acquire a cookie usiing the name of that cookie.
* If the cookie exists within the HTTP header then it is returned
* as a Cookie object. Otherwise this method will
* return null. Each cookie object will contain the name, value
* and path of the cookie as well as the optional domain part.
*
* @param name this is the name of the cookie object to acquire
*
* @return this returns a cookie object from the header or null
*/
public Cookie getCookie(String name) {
return request.getCookie(name);
}
/**
* This is used to acquire all cookies that were sent in the header.
* If any cookies exists within the HTTP header they are returned
* as Cookie objects. Otherwise this method will an
* empty list. Each cookie object will contain the name, value and
* path of the cookie as well as the optional domain part.
*
* @return this returns all cookie objects from the HTTP header
*/
public List getCookies() {
return request.getCookies();
}
/**
* This can be used to get the value of the first message header
* that has the specified name. The value provided from this will
* be trimmed so there is no need to modify the value, also if
* the header name specified refers to a comma seperated list of
* values the value returned is the first value in that list.
* This returns null if theres no HTTP message header.
*
* @param name the HTTP message header to get the value from
*
* @return this returns the value that the HTTP message header
*/
public String getValue(String name) {
return request.getValue(name);
}
/**
* This can be used to get the values of HTTP message headers
* that have the specified name. This is a convenience method that
* will present that values as tokens extracted from the header.
* This has obvious performance benifits as it avoids having to
* deal with substring and trim calls.
*
* The tokens returned by this method are ordered according to
* there HTTP quality values, or "q" values, see RFC 2616 section
* 3.9. This also strips out the quality parameter from tokens
* returned. So "image/html; q=0.9" results in "image/html". If
* there are no "q" values present then order is by appearence.
*
* The result from this is either the trimmed header value, that
* is, the header value with no leading or trailing whitespace
* or an array of trimmed tokens ordered with the most preferred
* in the lower indexes, so index 0 is has higest preference.
*
* @param name the name of the headers that are to be retrieved
*
* @return ordered array of tokens extracted from the header(s)
*/
public List getValues(String name) {
return request.getValues(name);
}
/**
* This is used to acquire the locales from the request header. The
* locales are provided in the Accept-Language header.
* This provides an indication as to the languages that the client
* accepts. It provides the locales in preference order.
*
* @return this returns the locales preferred by the client
*/
public List getLocales() {
return request.getLocales();
}
/**
* This is used to see if there is a HTTP message header with the
* given name in this container. If there is a HTTP message header
* with the specified name then this returns true otherwise false.
*
* @param name the HTTP message header to get the value from
*
* @return this returns true if the HTTP message header exists
*/
public boolean contains(String name) {
return request.contains(name);
}
/**
* This is a convenience method that can be used to determine the
* content type of the message body. This will determine whether
* there is a Content-Type header, if there is then
* this will parse that header and represent it as a typed object
* which will expose the various parts of the HTTP header.
*
* @return this returns the content type value if it exists
*/
public ContentType getContentType() {
return request.getContentType();
}
/**
* This is a convenience method that can be used to determine
* the length of the message body. This will determine if there
* is a Content-Length header, if it does then the
* length can be determined, if not then this returns -1.
*
* @return the content length, or -1 if it cannot be determined
*/
public int getContentLength() {
return request.getContentLength();
}
/**
* This is used to determine if the request has been transferred
* over a secure connection. If the protocol is HTTPS and the
* content is delivered over SSL then the request is considered
* to be secure. Also the associated response will be secure.
*
* @return true if the request is transferred securely
*/
public boolean isSecure() {
return request.isSecure();
}
/**
* This is a convenience method that is used to determine whether
* or not this message has the Connection: close
* header. If the close token is present then this stream is not
* a keep-alive connection. If this has no Connection
* header then the keep-alive status is determined by the HTTP
* version, that is, HTTP/1.1 is keep-alive by default, HTTP/1.0
* is not keep-alive by default.
*
* @return returns true if this has a keep-alive stream
*/
public boolean isKeepAlive() {
return request.isKeepAlive();
}
/**
* This can be used to retrieve the response attributes. These can
* be used to keep state with the response when it is passed to
* other systems for processing. Attributes act as a convenient
* model for storing objects associated with the response. This
* also inherits attributes associated with the client connection.
*
* @return the attributes of this Response object
*/
public Map getAttributes() {
return request.getAttributes();
}
/**
* This is used as a shortcut for acquiring attributes for the
* response. This avoids acquiring the attribute Map
* in order to retrieve the attribute directly from that object.
* The attributes contain data specific to the response.
*
* @param key this is the key of the attribute to acquire
*
* @return this returns the attribute for the specified name
*/
public Object getAttribute(Object key) {
return request.getAttribute(key);
}
/**
* This is used to acquire the remote client address. This can
* be used to acquire both the port and the I.P address for the
* client. It allows the connected clients to be logged and if
* require it can be used to perform course grained security.
*
* @return this returns the client address for this request
*/
public InetSocketAddress getClientAddress() {
return request.getClientAddress();
}
/**
* This is used to get the content body. This will essentially get
* the content from the body and present it as a single string.
* The encoding of the string is determined from the content type
* charset value. If the charset is not supported this will throw
* an exception. Typically only text values should be extracted
* using this method if there is a need to parse that content.
*
* @exception IOException signifies that there is an I/O problem
*
* @return InputStream containing the message body
*/
public String getContent() throws Exception {
return request.getContent();
}
/**
* This is used to read the content body. The specifics of the data
* that is read from this InputStream can be determined
* by the getContentLength method. If the data sent by
* the client is chunked then it is decoded, see RFC 2616 section
* 3.6. Also multipart data is available as Part objects
* however the raw content of the multipart body is still available.
*
* @exception Exception signifies that there is an I/O problem
*
* @return InputStream containing the message body
*/
public InputStream getInputStream() throws Exception {
return request.getInputStream();
}
/**
* This is used to read the content body. The specifics of the data
* that is read from this ReadableByteChannel can be
* determined by the getContentLength method. If the
* data sent by the client is chunked then it is decoded, see RFC
* 2616 section 3.6. This stream will never provide empty reads as
* the content is internally buffered, so this can do a full read.
*
* @return this returns the byte channel used to read the content
*/
public ReadableByteChannel getByteChannel() throws Exception {
return request.getByteChannel();
}
/**
* This method is used to acquire a Session for the
* request. The object retrieved provides a container for data
* associated to the connected client. This allows the request
* to perform more complex operations based on knowledge that is
* built up through a series of requests. The session is known
* to the system using a Cookie, which contains
* the session reference. This cookie value should not be
* modified as it used to reference the active session object.
*
* @return returns an active Session object
*/
public Session getSession() throws Exception {
return request.getSession();
}
/**
* This method is used to acquire a Session for the
* request. The object retrieved provides a container for data
* associated to the connected client. This allows the request
* to perform more complex operations based on knowledge that is
* built up through a series of requests. The session is known
* to the system using a Cookie, which contains
* the session reference. This cookie value should not be
* modified as it used to reference the active session object.
*
* @param create creates the session if it does not exist
*
* @return returns an active Session object
*/
public Session getSession(boolean create) throws Exception {
return request.getSession(create);
}
/**
* This is used to acquire all the form parameters from the
* HTTP request. This includes the query and POST data values
* as well as the parts of a multipart request. The form is
* a convenience object enabling easy access to state.
*
* @return this returns the form containing the state
*
* @throws Exception thrown if it could not be acquired
*/
public Form getForm() throws Exception {
return request.getForm();
}
/**
* This is used to provide quick access to the parameters. This
* avoids having to acquire the request Form object.
* This basically acquires the parameters object and invokes
* the getParameters method with the given name.
*
* @param name this is the name of the parameter value
*
* @exception Exception thrown if there is an I/O problem
*/
public String getParameter(String name) throws Exception {
return request.getParameter(name);
}
/**
* This method is used to acquire a Part from the
* form using a known name for the part. This is typically used
* when there is a file upload with a multipart POST request.
* All parts that are not files are added to the query values
* as strings so that they can be used in a convenient way.
*
* @param name this is the name of the part to acquire
*
* @return the named part or null if the part does not exist
*/
public Part getPart(String name) throws Exception {
return request.getPart(name);
}
}