/*
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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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* ExponentialFormat.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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* @author Yong Wang
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* @version $Revision: 1.4 $
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*/
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public class ExponentialFormat
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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 = -5298981701073897741L;
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protected DecimalFormat nf ;
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protected boolean sign;
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protected int digits;
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protected int exp;
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protected boolean trailing = true;
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public ExponentialFormat () {
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this( 5 );
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}
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public ExponentialFormat( int digits ) {
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this( digits, false );
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}
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public ExponentialFormat( int digits, boolean trailing ) {
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this( digits, 2, true, trailing );
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}
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public ExponentialFormat( int digits, int exp, boolean sign,
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boolean trailing ) {
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this.digits = digits;
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this.exp = exp;
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this.sign = sign;
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this.trailing = trailing;
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nf = new DecimalFormat( pattern() );
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nf.setPositivePrefix("+");
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nf.setNegativePrefix("-");
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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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if( sign ) return 1 + digits + 2 + exp;
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else return digits + 2 + exp;
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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( sign ) {
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if( s.charAt(0) == '+' ) s.setCharAt(0, ' ');
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}
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else {
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if( s.charAt(0) == '-' ) s.setCharAt(0, '*');
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else s.deleteCharAt(0);
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}
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return toAppendTo.append( s );
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}
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private String pattern() {
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StringBuffer s = new StringBuffer(); // "-##0.00E-00" // fw.d
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s.append("0.");
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for(int i = 0; i < digits - 1; i ++)
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if( trailing ) s.append('0');
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else s.append('#');
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s.append('E');
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for(int i = 0; i < exp; i ++)
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s.append('0');
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return s.toString();
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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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