dap4.servlet

Class DapRequest

java.lang.Object

dap4.servlet.DapRequest

public class DapRequest
extends Object

User requests get cached here so that downstream code can access the details of the request information.

Modified by Heimbigner for DAP4.

Author:

Nathan Potter, Dennis Heimbigner

Field Summary

Fields

Modifier and Type	Field and Description
protected String	contextpath
protected String	datasetpath
protected ResponseFormat	format
protected RequestMode	mode
protected Map<String,String>	queries
protected String	querystring
protected javax.servlet.http.HttpServletRequest	request
protected javax.servlet.http.HttpServletResponse	response
protected String	server
protected String	servletpath
protected ServletInfo	svcinfo
protected String	url

Constructor Summary

Constructors

Constructor and Description
DapRequest(ServletInfo svcinfo, javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response)

Method Summary

Methods

Modifier and Type	Method and Description
String	getDataset()
ResponseFormat	getFormat()
RequestMode	getMode()
String	getOriginalURL()
OutputStream	getOutputStream()
String	getPathInfo() Return the path info from the request url past the servlet name
String	getRealPath(String virtual) Return the absolute path for the /resources directory
javax.servlet.http.HttpServletRequest	getRequest()
javax.servlet.http.HttpServletResponse	getResponse()
String	getServletPath()
String	getURL()
String	getURLPath()
protected void	parse() The goal of parse() is to extract info from the underlying HttpRequest and cache it in this object.
String	queryLookup(String name)
void	setResponseHeader(String name, String value) Set a request header

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

svcinfo

protected ServletInfo svcinfo

request

protected javax.servlet.http.HttpServletRequest request

response

protected javax.servlet.http.HttpServletResponse response

url

protected String url

servletpath

protected String servletpath

contextpath

protected String contextpath

datasetpath

protected String datasetpath

querystring

protected String querystring

server

protected String server

mode

protected RequestMode mode

format

protected ResponseFormat format

queries

protected Map<String,String> queries

Constructor Detail

DapRequest

public DapRequest(ServletInfo svcinfo,
          javax.servlet.http.HttpServletRequest request,
          javax.servlet.http.HttpServletResponse response)
           throws DapException

Throws:

DapException

Method Detail

parse

protected void parse()
              throws IOException

The goal of parse() is to extract info from the underlying HttpRequest and cache it in this object.

In particular, the incoming URL needs to be decomposed into multiple pieces. Certain assumptions are made: 1. every incoming url is of the form (a) http(s)://host:port/d4ts/ or (b) http(s)://host:port/d4ts/?query Case a indicates that the front page is to be returned. Case b indicates a request for a dataset (or dsr), and its value is determined by its extensions. The query may be absent. We want to extract the following pieces. 1. (In URI parlance) The scheme plus the authority: http://host:port 2. The servlet path: should always be "d4ts". 3. The return type: depending on the last extension (e.g. ".txt"). 3. The requested: depending on the next to last extension (e.g. ".dap"). 5. The suffix path specifying the actual dataset: datasetpath with return and request type extensions removed. 6. The url path = servletpath + datasetpath. 7. The query part.

Throws:

IOException

getRequest

public javax.servlet.http.HttpServletRequest getRequest()

getResponse

public javax.servlet.http.HttpServletResponse getResponse()

getOutputStream

public OutputStream getOutputStream()
                             throws IOException

Throws:

IOException

getURL

public String getURL()

getOriginalURL

public String getOriginalURL()

getDataset

public String getDataset()

getServletPath

public String getServletPath()

getURLPath

public String getURLPath()

getMode

public RequestMode getMode()

getFormat

public ResponseFormat getFormat()

setResponseHeader

public void setResponseHeader(String name,
                     String value)

Set a request header

Parameters:

name - the header name

value - the header value

queryLookup

public String queryLookup(String name)

getRealPath

public String getRealPath(String virtual)

Return the absolute path for the /resources directory

Returns:

the absolute path for the /resources directory

getPathInfo

public String getPathInfo()

Return the path info from the request url past the servlet name

Returns:

the path