/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/*
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* FloatingPoint.java
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* Copyright (C) 2002 University of Waikato, Hamilton, New Zealand
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*
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*/
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package //weka.core.
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matrix;
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import weka.core.RevisionHandler;
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import weka.core.RevisionUtils;
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import java.text.DecimalFormat;
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import java.text.FieldPosition;
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/**
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* Class for the format of floating point numbers
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*
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* @author Yong Wang
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* @version $Revision: 1.4 $
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*/
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public class FloatingPointFormat
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extends DecimalFormat
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implements RevisionHandler {
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/** for serialization */
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private static final long serialVersionUID = 4500373755333429499L;
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protected DecimalFormat nf ;
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protected int width;
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protected int decimal;
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protected boolean trailing = true;
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/**
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* Default constructor
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*/
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public FloatingPointFormat () {
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this( 8, 5 );
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}
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public FloatingPointFormat ( int digits ) {
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this( 8, 2 );
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}
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public FloatingPointFormat( int w, int d ) {
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width = w;
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decimal = d;
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nf = new DecimalFormat( pattern(w, d) );
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nf.setPositivePrefix(" ");
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nf.setNegativePrefix("-");
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}
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public FloatingPointFormat( int w, int d, boolean trailingZeros ) {
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this( w, d );
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this.trailing = trailingZeros;
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}
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public StringBuffer format(double number, StringBuffer toAppendTo,
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FieldPosition pos) {
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StringBuffer s = new StringBuffer( nf.format(number) );
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if( s.length() > width ) {
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if( s.charAt(0) == ' ' && s.length() == width + 1 ) {
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s.deleteCharAt(0);
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}
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else {
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s.setLength( width );
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for( int i = 0; i < width; i ++ )
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s.setCharAt(i, '*');
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}
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}
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else {
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for (int i = 0; i < width - s.length(); i++) // padding
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s.insert(0,' ');
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}
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if( !trailing && decimal > 0 ) { // delete trailing zeros
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while( s.charAt( s.length()-1 ) == '0' )
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s.deleteCharAt( s.length()-1 );
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if( s.charAt( s.length()-1 ) == '.' )
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s.deleteCharAt( s.length()-1 );
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}
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return toAppendTo.append( s );
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}
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public static String pattern( int w, int d ) {
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StringBuffer s = new StringBuffer(); // "-##0.00" // fw.d
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s.append( padding(w - d - 3, '#') );
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if( d == 0) s.append('0');
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else {
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s.append("0.");
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s.append( padding( d, '0') );
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}
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return s.toString();
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}
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private static StringBuffer padding( int n, char c ) {
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StringBuffer text = new StringBuffer();
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for(int i = 0; i < n; i++ ){
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text.append( c );
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}
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return text;
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}
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public int width () {
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if( !trailing ) throw new RuntimeException( "flexible width" );
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return width;
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}
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/**
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* Returns the revision string.
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*
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* @return the revision
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*/
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public String getRevision() {
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return RevisionUtils.extract("$Revision: 1.4 $");
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}
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}
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