public class ValueParser extends ListParser<String>
ValueParser
is used to extract a comma separated
list of HTTP header values. This will extract values without
any leading or trailing spaces, which enables the values to be
used. Listing the values that appear in the header also requires
that the values are ordered. This orders the values using the
values that appear with any quality parameter associated with it.
The quality value is a special parameter that often found in a
comma separated value list to specify the client preference.
image/gif, image/jpeg, text/html image/gif;q=1.0, image/jpeg;q=0.8, image/png; q=1.0,*;q=0.1 gzip;q=1.0, identity; q=0.5, *;q=0The above lists taken from RFC 2616 provides an example of the common form comma separated values take. The first illustrates a simple comma delimited list, here the ordering of values is determined from left to right. The second and third list have quality values associated with them, these are used to specify a preference and thus order.
Each value within a list has an implicit quality value of 1.0.
If the value is explicitly set with a the "q" parameter, then
the values can range from 1.0 to 0.001. This parser ensures
that the order of values returned from the list
method adheres to the optional quality parameters and ensures
that the quality parameters a removed from the resulting text.
Constructor and Description |
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ValueParser()
Constructor for the
ValueParser . |
ValueParser(List<String> list)
Constructor for the
ValueParser . |
ValueParser(String text)
Constructor for the
ValueParser . |
Modifier and Type | Method and Description |
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protected String |
create(char[] text,
int start,
int len)
This creates a string object using an offset and a length.
|
init, list, parse, parse
public ValueParser()
ValueParser
. This creates
a parser with no initial parse data, if there are headers to
be parsed then the parse(String)
method or
parse(List)
method can be used. This will
parse a delimited list according so RFC 2616 section 4.2.public ValueParser(String text)
ValueParser
. This creates
a parser with the text supplied. This will parse the comma
separated list according to RFC 2616 section 2.1 and 4.2.
The tokens can be extracted using the list
method, which will also sort and trim the tokens.text
- this is the comma separated list to be parsedpublic ValueParser(List<String> list)
ValueParser
. This creates
a parser with the text supplied. This will parse the comma
separated list according to RFC 2616 section 2.1 and 4.2.
The tokens can be extracted using the list
method, which will also sort and trim the tokens.list
- a list of comma separated lists to be parsedprotected String create(char[] text, int start, int len)
create
in class ListParser<String>
text
- this is the text buffer to acquire the value fromstart
- the offset within the buffer to take characterslen
- this is the number of characters within the tokenCopyright © 2021. All rights reserved.