info.aduna.webapp.util
Class HttpServerUtil

java.lang.Object
  info.aduna.webapp.util.HttpServerUtil

public class HttpServerUtil
extends Object

Constructor Summary

HttpServerUtil()

Method Summary

static List<HeaderElement>	getHeaderElements(javax.servlet.http.HttpServletRequest request, String headerName) Gets the elements of the request header with the specified name.
static String	getMIMEType(String contentType) Extracts the MIME type from the specified content type string.
static String	getPostDataParameter(Map<String,Object> formData, String name) Gets the trimmed value of a request parameter as a String.
static boolean	isEmpty(String string)
static boolean	isFalse(String string)
static boolean	isTrue(String string)
static HeaderElement	matchAcceptHeader(String mimeTypeSpec, List<HeaderElement> acceptElements) Tries to match the specified MIME type spec against the list of Accept header elements, returning the applicable header element if available.
static String	selectPreferredMIMEType(Iterator<String> mimeTypes, javax.servlet.http.HttpServletRequest request) Selects from a set of MIME types, the MIME type that has the highest quality score when matched with the Accept headers in the supplied request.
static List<String>	splitHeaderString(String s, char splitChar) Splits the supplied string into sub parts using the specified splitChar as a separator, ignoring occurrences of this character inside quoted strings.

Methods inherited from class java.lang.Object

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

Constructor Detail

HttpServerUtil

public HttpServerUtil()

Method Detail

getMIMEType

public static String getMIMEType(String contentType)

Extracts the MIME type from the specified content type string. This method parses the content type string and returns just the MIME type, ignoring any parameters that are included.

Parameters:

contentType - A content type string, e.g. application/xml; charset=utf-8 .

Returns:

The MIME type part of the specified content type string, or null if the specified content type string was null.

selectPreferredMIMEType

public static String selectPreferredMIMEType(Iterator<String> mimeTypes,
                                             javax.servlet.http.HttpServletRequest request)

Selects from a set of MIME types, the MIME type that has the highest quality score when matched with the Accept headers in the supplied request.

Parameters:

mimeTypes - The set of available MIME types.

request - The request to match the MIME types against.

Returns:

The MIME type that best matches the types that the client finds acceptable, or null in case no acceptable MIME type could be found.

getHeaderElements

public static List<HeaderElement> getHeaderElements(javax.servlet.http.HttpServletRequest request,
                                                    String headerName)

Gets the elements of the request header with the specified name.

Parameters:

request - The request to get the header from.

headerName - The name of the header to get the elements of.

Returns:

A List of HeaderElement objects.

splitHeaderString

public static List<String> splitHeaderString(String s,
                                             char splitChar)

Splits the supplied string into sub parts using the specified splitChar as a separator, ignoring occurrences of this character inside quoted strings.

Parameters:

s - The header string to split into sub parts.

splitChar - The character to use as separator.

Returns:

A List of Strings.

matchAcceptHeader

public static HeaderElement matchAcceptHeader(String mimeTypeSpec,
                                              List<HeaderElement> acceptElements)

Tries to match the specified MIME type spec against the list of Accept header elements, returning the applicable header element if available.

Parameters:

mimeTypeSpec - The MIME type to determine the quality for, e.g. "text/plain" or "application/xml; charset=utf-8".

acceptElements - A List of HeaderElement objects.

Returns:

The Accept header element that matches the MIME type spec most closely, or null if no such header element could be found.

getPostDataParameter

public static String getPostDataParameter(Map<String,Object> formData,
                                          String name)

Gets the trimmed value of a request parameter as a String.

Returns:

The trimmed value, or null if the parameter does not exist.

isEmpty

public static boolean isEmpty(String string)

Returns:

true if the string is either null or equal to ""

isTrue

public static boolean isTrue(String string)

Returns:

true if the string is !isEmpty and equal to "true"

isFalse

public static boolean isFalse(String string)

Returns:

true if the string is !isEmpty and equal to "false"