/*
* Copyright 2009 Keith Stevens
*
* This file is part of the S-Space package and is covered under the terms and
* conditions therein.
*
* The S-Space package is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation and distributed hereunder to you.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND NO REPRESENTATIONS OR WARRANTIES,
* EXPRESS OR IMPLIED ARE MADE. BY WAY OF EXAMPLE, BUT NOT LIMITATION, WE MAKE
* NO REPRESENTATIONS OR WARRANTIES OF MERCHANT- ABILITY OR FITNESS FOR ANY
* PARTICULAR PURPOSE OR THAT THE USE OF THE LICENSED SOFTWARE OR DOCUMENTATION
* WILL NOT INFRINGE ANY THIRD PARTY PATENTS, COPYRIGHTS, TRADEMARKS OR OTHER
* RIGHTS.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package edu.ucla.sspace.matrix;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOError;
import java.io.IOException;
import java.io.PrintWriter;
/**
* A {@link FileTransformer} for matrix files in the {@link
* Format#SVDLIBC_SPARSE_TEXT} format.
*
* @author Keith Stevens
*/
class SvdlibcSparseTextFileTransformer implements FileTransformer {
/**
* {@inheritDoc}
*/
public File transform(File inputFile,
File outFile,
GlobalTransform transform) {
try {
BufferedReader br = new BufferedReader(new FileReader(inputFile));
PrintWriter writer = new PrintWriter(new BufferedWriter(
new FileWriter(outFile)));
// Read in the header for matrix file.
String line = br.readLine();
String[] rowColNonZeroCount = line.split("\\s+");
int numRows = Integer.parseInt(rowColNonZeroCount[0]);
int numCols = Integer.parseInt(rowColNonZeroCount[1]);
int numTotalNonZeros = Integer.parseInt(rowColNonZeroCount[2]);
// Write out the header for the new matrix file.
writer.printf("%d %d %d\n", numRows, numCols, numTotalNonZeros);
line = br.readLine();
// Traverse each column in the matrix.
for (int col = 0; line != null && col < numCols; ++col) {
int numNonZeros = Integer.parseInt(line);
writer.printf("%d\n", numNonZeros);
// Transform each of the non zero values for the new matrix
// file.
for (int index = 0; (line = br.readLine()) != null &&
index < numNonZeros; ++index) {
String[] rowValue = line.split("\\s+");
int row = Integer.parseInt(rowValue[0]);
double value = Double.parseDouble(rowValue[1]);
writer.printf("%d %f\n", row,
transform.transform(row, col, value));
}
}
writer.close();
} catch (IOException ioe) {
throw new IOError(ioe);
}
return outFile;
}
}