package com.imsl.test.example.io;

import com.imsl.io.MPSReader;
import java.io.*;
import java.util.Iterator;

/**
 *
 * <h4>Reads an MPS file.</h4>
 *
 * This example reads the data for a linear programming problem from an MPS
 * file, using the class {@link MPSReader}.
 *
 * @see <a href="MPSReaderEx1.java">Code</a>
 * @see <a href="doc-files/MPSReaderEx1.out">Output</a>
 */
public class MPSReaderEx1 {

    static public void main(String arg[])
            throws IOException, MPSReader.InvalidMPSFileException {
        InputStream stream
                = MPSReaderEx1.class.getResourceAsStream("testprob.mps");
        Reader reader = new InputStreamReader(stream);
        MPSReader mps = new MPSReader();
        mps.read(reader);

        System.out.println("Name   " + mps.getName());
        System.out.println("RHS    " + mps.getNameRHS());
        System.out.println("BOUNDS " + mps.getNameBounds());
        System.out.println("RANGES " + mps.getNameRanges());

        int nRows = mps.getNumberOfRows();
        System.out.println("NumberOfConstraints " + nRows);
        for (int i = 0; i < nRows; i++) {
            System.out.println("   "
                    + mps.getLowerRange(i)
                    + " <= row[" + i + "] = "
                    + mps.getNameRow(i)
                    + " <= " + mps.getUpperRange(i));
        }

        int nColumns = mps.getNumberOfColumns();
        System.out.println("NumberOfColumns " + nColumns);
        for (int i = 0; i < nColumns; i++) {
            System.out.println("   "
                    + mps.getLowerBound(i)
                    + " <= var[" + i + "] = "
                    + mps.getNameColumn(i)
                    + " <= " + mps.getUpperBound(i));
        }

        System.out.println("NumberOfNonZeros " + mps.getNumberOfNonZeros());
        for (int iRow = 0; iRow < nRows; iRow++) {
            System.out.println("       row " + mps.getNameRow(iRow));
            Iterator iter = mps.getRow(iRow).iterator();
            while (iter.hasNext()) {
                MPSReader.Element elem = (MPSReader.Element) iter.next();
                int iColumn = elem.getColumn();
                String nameColumn = mps.getNameColumn(iColumn);
                System.out.println("          " + nameColumn
                        + ": " + elem.getValue());
            }
        }

        reader.close();
        stream.close();
    }
}