Package net.sf.statcvs.util
Class LookaheadReader
java.lang.Object
net.sf.statcvs.util.LookaheadReader
Wraps a Reader
for line-by-line access.
This works like Iterator
: hasNextLine()
returns true if another line can be read; nextLine
reads
the next line and returns it. Additionally, getCurrentLine()
can be used to access multiple times the line returned by
nextLine().
At construction time, getCurrentLine() is undefined. nextLine() must be called once to read the first line.
- Version:
- $Id: LookaheadReader.java,v 1.4 2008/04/02 11:22:15 benoitx Exp $
- Author:
- Richard Cyganiak (richard@cyganiak.de)
-
Constructor Summary
ConstructorsConstructorDescriptionLookaheadReader
(Reader reader) Creates a LookaheadReader from a source reader. -
Method Summary
Modifier and TypeMethodDescriptionReturns the current line without reading a line from the source reader.int
Returns the number of the line that would be returned bygetCurrentLine()
, or 0 before the first call tonextLine
.boolean
Checks if more lines are available for reading.nextLine()
Reads and returns a line from the source reader.
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Constructor Details
-
LookaheadReader
Creates a LookaheadReader from a source reader.- Parameters:
reader
- a reader whose contents will be returned by the LookaheadReader
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Method Details
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getCurrentLine
Returns the current line without reading a line from the source reader. Will throw an exception ifnextLine
was not called before.- Returns:
- The line returned by the previous call to
nextLine()
- Throws:
NoSuchElementException
- ifnextLine
was not yet called
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nextLine
Reads and returns a line from the source reader. The result of this call will be the new current line. Will throw an exception if trying to read from after the end of the source reader.- Returns:
- The next line of the source reader
- Throws:
IOException
- on error while reading the source readerNoSuchElementException
- ifhasNextLine()
is false
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hasNextLine
Checks if more lines are available for reading.- Returns:
- true if at least one more line can be read
- Throws:
IOException
- on error while reading the source reader
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getLineNumber
public int getLineNumber()Returns the number of the line that would be returned bygetCurrentLine()
, or 0 before the first call tonextLine
. The first line has line number 1.- Returns:
- the current line number
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