Class GeneralParser
- Author:
- Tobias Downer
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Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionstatic BigDecimal
This assumes there is a decimal number waiting on the iterator.static void
parseDigitString
(CharacterIterator i, StringBuffer digit_str) Parses a string of 0 or more digits and appends the digits into the string buffer.static BigDecimal
Parses a time grammer waiting on the character iterator.static void
parseWordString
(CharacterIterator i, StringBuffer word_buffer) Parses a string of 0 or more words and appends the characters into the string buffer.static void
Moves the iterator past any white space.
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Constructor Details
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GeneralParser
public GeneralParser()
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Method Details
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parseDigitString
Parses a string of 0 or more digits and appends the digits into the string buffer. -
parseWordString
Parses a string of 0 or more words and appends the characters into the string buffer. -
skipWhiteSpace
Moves the iterator past any white space. White space is ' ', '\t', '\n' and '\r'. -
parseBigDecimal
This assumes there is a decimal number waiting on the iterator. It parses the decimal and returns the BigDecimal representation. It throws a GeneralParseException if we are unable to parse the decimal.- Throws:
ParseException
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parseTimeMeasure
Parses a time grammer waiting on the character iterator. The grammer is quite simple. It allows for us to specify quite precisely some unit of time measure and convert it to a Java understandable form. It returns the number of milliseconds that the unit of time represents. For example, the string '2.5 hours' would return: 2.5 hours * 60 minutes * 60 seconds * 1000 milliseconds = 9000000To construct a valid time measure, you must supply a sequence of time measurements. The valid time measurements are 'week(s)', 'day(s)', 'hour(s)', 'minute(s)', 'second(s)', 'millisecond(s)'. To construct a time, we simply concatinate the measurements together. For example, '3 days 22 hours 9.5 minutes'
It accepts any number of time measurements, but not duplicates of the same.
The time measures are case insensitive. It is a little lazy how it reads the grammer. We could for example enter '1 hours 40 second' or even more extreme, '1 houraboutit 90 secondilianit' both of which are acceptable!
This method will keep on parsing the string until the end of the iterator is reached or a non-numeric time measure is found. It throws a ParseException if an invalid time measure is found or a number is invalid (eg. -3 days).
LOCALE ISSUE: This will likely be a difficult method to localise.
- Throws:
ParseException
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