com.google.gdata.util.parser

Class Difference<T>

java.lang.Object

com.google.gdata.util.parser.Parser<T>

com.google.gdata.util.parser.Difference<T>

Type Parameters:

T -

public class Difference<T>
extends Parser<T>

The Difference parser matches the prefix of the parse buffer if the left parser matches and the right parser does not. The following is a complicated way of constructing a parser which matches a digit: Parser p = Parser.difference(Chset.ALNUM, Chset.ALPHA); p.parse("0") -> matches "0" p.parse("a") -> no match

See Also:

Parser

Field Summary

Fields inherited from class com.google.gdata.util.parser.Parser

NO_MATCH

Constructor Summary

Constructors

Constructor and Description
Difference(Parser<? super T> left, Parser<? super T> right) Class constructor.

Method Summary

Methods

Modifier and Type	Method and Description
int	parse(char[] buf, int start, int end, T data) Matches the prefix of the buffer (buf[start,end)) being parsed if, and only if, the left sub-parser matches the incoming state of the buffer and the right sub-parser does not match the incoming state of the parse buffer.

Methods inherited from class com.google.gdata.util.parser.Parser

action, alternative, difference, intersection, list, optional, parse, parse, parse, plus, repeat, repeat, sequence, sequence, sequence, sequence, star

Methods inherited from class java.lang.Object

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

Constructor Detail

Difference

public Difference(Parser<? super T> left,
          Parser<? super T> right)

Class constructor.

Parameters:

left - The Parser that must match against the parse buffer.

right - The Parser that must not match against the parse buffer.

Method Detail

parse

public int parse(char[] buf,
        int start,
        int end,
        T data)

Matches the prefix of the buffer (buf[start,end)) being parsed if, and only if, the left sub-parser matches the incoming state of the buffer and the right sub-parser does not match the incoming state of the parse buffer. It does not make much sense to specify a right sub-parser that matches the empty string as doing so will cause this function to always return NO_MATCH.

Specified by:

parse in class Parser<T>

Parameters:

buf - The character array to match against.

start - The start offset of data within the character array to match against.

end - The end offset of data within the character array to match against.

data - User defined object that is passed to Callback.handle when an Action fires.

See Also:

Parser.parse(char[], int, int, T)