drasys.or.mp.util
Class MPSReader

java.lang.Object
  |
  +--java.io.Reader
        |
        +--java.io.BufferedReader
              |
              +--drasys.or.mp.util.MPSReader

public class MPSReader

extends java.io.BufferedReader

implements ProblemReaderI

Inputs a mathematical programming problem from an MPS stream. There are two predominate versions of the MPS format. An older format that uses fixed field records and a newer format that uses white-space delimited records. The fixed record format limits row/column names to eight characters and the delimited format allows names of arbitrary length. An MPS reader that reads delimited records can read fixed records with no changes if the row/column names don't contain embedded spaces. This class reads records using the newer delimited format which allows it to read both MPS versions. If the stream contains a NAME record it will be read into the 'lp.name' metadatum.

References:

Linear Programming
    Vasek Chvatal / Paperback / Published 1983
Integer and Combinatorial Optimization
    George L. Nemhauser, Laurence A. Wolsey / Paperback / Published 1988
Integer Programming
    Laurence A. Wolsey / Hardcover / Published 1998

Fields inherited from class java.io.Reader

lock

 

Constructor Summary

MPSReader(java.io.Reader in)

MPSReader(java.io.Reader in, int sz)

 

Method Summary
boolean	parseComment(SizableProblemI problem, int lineNumber, java.lang.String line)           This method is called to parse comment lines.
boolean	parseLine(SizableProblemI problem, int lineNumber, java.lang.String line)           This method is called to parse each line in the 'MPS' stream.
SizableProblemI	readProblem(SizableProblemI problem)           Parses the MPS stream and puts the data into 'problem'.

 

Methods inherited from class java.io.BufferedReader

close, mark, markSupported, read, read, readLine, ready, reset, skip

 

Methods inherited from class java.io.Reader

read

 

Methods inherited from class java.lang.Object

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

 

Constructor Detail

MPSReader

public MPSReader(java.io.Reader in)

MPSReader

public MPSReader(java.io.Reader in,
                 int sz)

readProblem

public SizableProblemI readProblem(SizableProblemI problem)
                            throws java.io.IOException,
                                   SyntaxException

Parses the MPS stream and puts the data into 'problem'.

Specified by:

readProblem in interface ProblemReaderI

parseLine

public boolean parseLine(SizableProblemI problem,
                         int lineNumber,
                         java.lang.String line)
                  throws java.io.IOException,
                         DuplicateException,
                         SyntaxException,
                         NotFoundException,
                         InvalidException

This method is called to parse each line in the 'MPS' stream. It can be overridden to customize line parsing.

Returns:

'false' to stop reading or 'true' to continue reading.

parseComment

public boolean parseComment(SizableProblemI problem,
                            int lineNumber,
                            java.lang.String line)
                     throws SyntaxException

This method is called to parse comment lines. It can be overridden to customize comment parsing.

Returns:

'false' to stop reading or 'true' to continue reading.