Package edu.isi.pegasus.planner.parser
Class SiteCatalogTextScanner
- java.lang.Object
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- edu.isi.pegasus.planner.parser.SiteCatalogTextScanner
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class SiteCatalogTextScanner extends java.lang.Object
Implements the scanner for reserved words and other tokens that are generated from the input stream. This class is module-local on purpose.- Author:
- Jens Vöckler
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Field Summary
Fields Modifier and Type Field Description private java.io.LineNumberReader
m_in
Stores the stream from which we are currently scanning.private int
m_lookAhead
Captures the look-ahead character.
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Constructor Summary
Constructors Constructor Description SiteCatalogTextScanner(java.io.Reader reader)
Starts to scan the given stream.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description int
getLineNumber()
Obtains the current line number in the input stream from the outside.boolean
hasMoreTokens()
Checks for the availability of more input.Token
nextToken()
Obtains the next token from the input stream.private void
skipWhitespace()
Skips any white space and comments in the input.
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Method Detail
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getLineNumber
public int getLineNumber()
Obtains the current line number in the input stream from the outside.- Returns:
- the current line number.
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skipWhitespace
private void skipWhitespace() throws java.io.IOException
Skips any white space and comments in the input. This method stops either at the end of file, or at any non-whitespace input character.- Throws:
java.io.IOException
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hasMoreTokens
public boolean hasMoreTokens() throws java.io.IOException
Checks for the availability of more input.- Returns:
- true, if there is more to read, false for EOF.
- Throws:
java.io.IOException
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nextToken
public Token nextToken() throws java.io.IOException, ScannerException
Obtains the next token from the input stream.- Returns:
- an instance conforming to the token interface, or null for eof.
- Throws:
java.io.IOException
- if something went wrong while readingjava.lang.Exception
- if a lexical error was encountered.ScannerException
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