Class RequestWrapper

  • All Implemented Interfaces:
    Request, RequestHeader, RequestLine

    public class RequestWrapper
    extends java.lang.Object
    implements Request
    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.
    • Field Summary

      Fields 
      Modifier and Type Field Description
      protected Request request
      This is the request instance that is being wrapped.
    • Constructor Summary

      Constructors 
      Constructor Description
      RequestWrapper​(Request request)
      Constructor for RequestWrapper object.
    • Method Summary

      All Methods Instance Methods Concrete Methods 
      Modifier and Type Method Description
      Address getAddress()
      This is used to acquire the address from the request line.
      java.lang.Object getAttribute​(java.lang.Object key)
      This is used as a shortcut for acquiring attributes for the response.
      java.util.Map getAttributes()
      This can be used to retrieve the response attributes.
      java.nio.channels.ReadableByteChannel getByteChannel()
      This is used to read the content body.
      Channel getChannel()
      This provides the underlying channel for the request.
      java.net.InetSocketAddress getClientAddress()
      This is used to acquire the remote client address.
      Certificate getClientCertificate()
      This is used to acquire the SSL certificate used when the server is using a HTTPS connection.
      java.lang.String getContent()
      This is used to get the content body.
      long getContentLength()
      This is a convenience method that can be used to determine the length of the message body.
      ContentType getContentType()
      This is a convenience method that can be used to determine the content type of the message body.
      Cookie getCookie​(java.lang.String name)
      This is used to acquire a cookie usiing the name of that cookie.
      java.util.List<Cookie> getCookies()
      This is used to acquire all cookies that were sent in the header.
      long getDate​(java.lang.String name)
      This can be used to get the date of the first message header that has the specified name.
      java.lang.CharSequence getHeader()
      This method returns a CharSequence holding the header consumed for the request.
      java.io.InputStream getInputStream()
      This is used to read the content body.
      int getInteger​(java.lang.String name)
      This can be used to get the integer of the first message header that has the specified name.
      java.util.List<java.util.Locale> getLocales()
      This is used to acquire the locales from the request header.
      int getMajor()
      This can be used to get the major number from a HTTP version.
      java.lang.String getMethod()
      This can be used to get the HTTP method for this request.
      int getMinor()
      This can be used to get the major number from a HTTP version.
      java.util.List<java.lang.String> getNames()
      This method is used to get a List of the names for the headers.
      java.lang.String getParameter​(java.lang.String name)
      This is used to provide quick access to the parameters.
      Part getPart​(java.lang.String name)
      This method is used to acquire a Part from the HTTP request using a known name for the part.
      java.util.List<Part> getParts()
      This method is used to get all Part objects that are associated with the request.
      Path getPath()
      This is used to acquire the path as extracted from the HTTP request URI.
      Query getQuery()
      This method is used to acquire the query part from the HTTP request URI target and a form post if it exists.
      long getRequestTime()
      This is the time in milliseconds when the request was first read from the underlying socket.
      java.lang.String getTarget()
      This can be used to get the URI specified for this HTTP request.
      java.lang.String getValue​(java.lang.String name)
      This can be used to get the value of the first message header that has the specified name.
      java.lang.String getValue​(java.lang.String name, int index)
      This can be used to get the value of the first message header that has the specified name.
      java.util.List<java.lang.String> getValues​(java.lang.String name)
      This can be used to get the values of HTTP message headers that have the specified name.
      boolean isKeepAlive()
      This is a convenience method that is used to determine whether or not this message has the Connection: close header.
      boolean isSecure()
      This is used to determine if the request has been transferred over a secure connection.
      java.lang.String toString()
      This method returns a string representing the header that was consumed for this request.
      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
    • Field Detail

      • request

        protected Request request
        This is the request instance that is being wrapped.
    • Constructor Detail

      • RequestWrapper

        public RequestWrapper​(Request request)
        Constructor for RequestWrapper object. This allows the original Request object to be wrapped so that adjustments to the behaviour of a request object handed to the container can be provided by a subclass implementation.
        Parameters:
        request - the request object that is being wrapped
    • Method Detail

      • getMajor

        public int 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 1 of a HTTP/1.0 version string.
        Specified by:
        getMajor in interface RequestLine
        Returns:
        the major version number for the request message
      • getMinor

        public int getMinor()
        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.
        Specified by:
        getMinor in interface RequestLine
        Returns:
        the major version number for the request message
      • getMethod

        public java.lang.String getMethod()
        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.
        Specified by:
        getMethod in interface RequestLine
        Returns:
        the request method for this request message
      • getTarget

        public java.lang.String getTarget()
        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.
        Specified by:
        getTarget in interface RequestLine
        Returns:
        the URI address that this HTTP request is targeting
      • getAddress

        public Address getAddress()
        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.
        Specified by:
        getAddress in interface RequestLine
        Returns:
        this returns the address of the request line
      • getPath

        public Path getPath()
        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.
        Specified by:
        getPath in interface RequestLine
        Returns:
        this returns the normalized path for the request
      • getQuery

        public Query getQuery()
        This method is used to acquire the query part from the HTTP request URI target and a form post if it exists. Both the query and the form post are merge together in a single query.
        Specified by:
        getQuery in interface RequestLine
        Returns:
        the query associated with the HTTP target URI
      • getNames

        public java.util.List<java.lang.String> getNames()
        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.
        Specified by:
        getNames in interface RequestHeader
        Returns:
        this returns a list of the names within the header
      • getInteger

        public int getInteger​(java.lang.String name)
        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.
        Specified by:
        getInteger in interface RequestHeader
        Parameters:
        name - the HTTP message header to get the value from
        Returns:
        this returns the date as a long from the header value
      • getDate

        public long getDate​(java.lang.String 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.
        Specified by:
        getDate in interface RequestHeader
        Parameters:
        name - the HTTP message header to get the value from
        Returns:
        this returns the date as a long from the header value
      • getCookie

        public Cookie getCookie​(java.lang.String 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.
        Specified by:
        getCookie in interface RequestHeader
        Parameters:
        name - this is the name of the cookie object to acquire
        Returns:
        this returns a cookie object from the header or null
      • getCookies

        public java.util.List<Cookie> getCookies()
        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.
        Specified by:
        getCookies in interface RequestHeader
        Returns:
        this returns all cookie objects from the HTTP header
      • getValue

        public java.lang.String getValue​(java.lang.String name)
        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.
        Specified by:
        getValue in interface RequestHeader
        Parameters:
        name - the HTTP message header to get the value from
        Returns:
        this returns the value that the HTTP message header
      • getValue

        public java.lang.String getValue​(java.lang.String name,
                                         int index)
        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 separated list of values the value returned is the first value in that list. This returns null if theres no HTTP message header.
        Specified by:
        getValue in interface RequestHeader
        Parameters:
        name - the HTTP message header to get the value from
        index - if there are multiple values this selects one
        Returns:
        this returns the value that the HTTP message header
      • getValues

        public java.util.List<java.lang.String> getValues​(java.lang.String 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.

        Specified by:
        getValues in interface RequestHeader
        Parameters:
        name - the name of the headers that are to be retrieved
        Returns:
        ordered array of tokens extracted from the header(s)
      • getLocales

        public java.util.List<java.util.Locale> getLocales()
        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.
        Specified by:
        getLocales in interface RequestHeader
        Returns:
        this returns the locales preferred by the client
      • getContentType

        public ContentType getContentType()
        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.
        Specified by:
        getContentType in interface RequestHeader
        Returns:
        this returns the content type value if it exists
      • getContentLength

        public long getContentLength()
        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.
        Specified by:
        getContentLength in interface RequestHeader
        Returns:
        the content length, or -1 if it cannot be determined
      • isSecure

        public boolean isSecure()
        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.
        Specified by:
        isSecure in interface Request
        Returns:
        true if the request is transferred securely
      • isKeepAlive

        public boolean isKeepAlive()
        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.
        Specified by:
        isKeepAlive in interface Request
        Returns:
        returns true if this has a keep-alive stream
      • getRequestTime

        public long getRequestTime()
        This is the time in milliseconds when the request was first read from the underlying socket. The time represented here represents the time collection of this request began. This does not necessarily represent the time the bytes arrived as as some data may have been buffered before it was parsed.
        Specified by:
        getRequestTime in interface Request
        Returns:
        this represents the time the request arrived at
      • getChannel

        public Channel getChannel()
        This provides the underlying channel for the request. It contains the TCP socket channel and various other low level components. Typically this will only ever be needed when there is a need to switch protocols.
        Specified by:
        getChannel in interface Request
        Returns:
        the underlying channel for this request
      • getClientCertificate

        public Certificate getClientCertificate()
        This is used to acquire the SSL certificate used when the server is using a HTTPS connection. For plain text connections or connections that use a security mechanism other than SSL this will be null. This is only available when the connection makes specific use of an SSL engine to secure the connection.
        Specified by:
        getClientCertificate in interface Request
        Returns:
        this returns the associated SSL certificate if any
      • getAttributes

        public java.util.Map getAttributes()
        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.
        Specified by:
        getAttributes in interface Request
        Returns:
        the attributes that have been set on this response
      • getAttribute

        public java.lang.Object getAttribute​(java.lang.Object key)
        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.
        Specified by:
        getAttribute in interface Request
        Parameters:
        key - this is the key of the attribute to acquire
        Returns:
        this returns the attribute for the specified name
      • getClientAddress

        public java.net.InetSocketAddress getClientAddress()
        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.
        Specified by:
        getClientAddress in interface Request
        Returns:
        this returns the client address for this request
      • getHeader

        public java.lang.CharSequence getHeader()
        This method returns a CharSequence holding the header consumed for the request. A character sequence is returned as it can provide a much more efficient means of representing the header data by just wrapping the consumed byte array.
        Specified by:
        getHeader in interface RequestHeader
        Returns:
        this returns the characters consumed for the header
      • getContent

        public java.lang.String getContent()
                                    throws java.io.IOException
        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.
        Specified by:
        getContent in interface Request
        Returns:
        the body content as an encoded string value
        Throws:
        java.io.IOException - signifies that there is an I/O problem
      • getInputStream

        public java.io.InputStream getInputStream()
                                           throws java.io.IOException
        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.
        Specified by:
        getInputStream in interface Request
        Returns:
        returns the input stream containing the message body
        Throws:
        java.lang.Exception - signifies that there is an I/O problem
        java.io.IOException
      • getByteChannel

        public java.nio.channels.ReadableByteChannel getByteChannel()
                                                             throws java.io.IOException
        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.
        Specified by:
        getByteChannel in interface Request
        Returns:
        this returns the byte channel used to read the content
        Throws:
        java.io.IOException
      • getParameter

        public java.lang.String getParameter​(java.lang.String name)
        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.
        Specified by:
        getParameter in interface Request
        Parameters:
        name - this is the name of the parameter value
      • getPart

        public Part getPart​(java.lang.String name)
        This method is used to acquire a Part from the HTTP request 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 can be acquired as string values from the attachment object.
        Specified by:
        getPart in interface Request
        Parameters:
        name - this is the name of the part object to acquire
        Returns:
        the named part or null if the part does not exist
      • getParts

        public java.util.List<Part> getParts()
        This method is used to get all Part objects that are associated with the request. Each attachment contains the body and headers associated with it. If the request is not a multipart POST request then this will return an empty list.
        Specified by:
        getParts in interface Request
        Returns:
        the list of parts associated with this request
      • toString

        public java.lang.String toString()
        This method returns a string representing the header that was consumed for this request. For performance reasons it is better to acquire the character sequence representing the header as it does not require the allocation on new memory.
        Specified by:
        toString in interface RequestHeader
        Overrides:
        toString in class java.lang.Object
        Returns:
        this returns a string representation of this request