Package org.simpleframework.http.parse
Class ValueParser
The
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.
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Field Summary
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Constructor Summary
ConstructorsConstructorDescriptionConstructor for theValueParser
.ValueParser
(String text) Constructor for theValueParser
.ValueParser
(List<String> list) Constructor for theValueParser
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Method Summary
Methods inherited from class org.simpleframework.http.parse.ListParser
init, list, parse, parse
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Constructor Details
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ValueParser
public ValueParser()Constructor for theValueParser
. This creates a parser with no initial parse data, if there are headers to be parsed then theparse(String)
method orparse(List)
method can be used. This will parse a delimited list according so RFC 2616 section 4.2. -
ValueParser
Constructor for theValueParser
. 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 thelist
method, which will also sort and trim the tokens.- Parameters:
text
- this is the comma separated list to be parsed
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ValueParser
Constructor for theValueParser
. 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 thelist
method, which will also sort and trim the tokens.- Parameters:
list
- a list of comma separated lists to be parsed
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Method Details
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create
This creates a string object using an offset and a length. The string is created from the extracted token and the offset and length ensure that no leading or trailing whitespace are within the created string object.- Specified by:
create
in classListParser<String>
- Parameters:
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 token
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