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finmath lib is a Mathematical Finance Library in Java. It provides algorithms and methodologies related to mathematical finance.
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/*
 * Created on 09.08.2005
 *
 * (c) Copyright Christian P. Fries, Germany. All rights reserved. Contact: [email protected].
 */
package net.finmath.swing;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import java.text.ParseException;

import javax.swing.JTextField;

/**
 * A Java swing bean to represent a number field in a GUI. Features admissible values.
 * 
 * @author Christian Fries
 */
public class JNumberField extends JTextField implements ActionListener {

    private static final long serialVersionUID = -138039675088007707L;

	Number value = new Double(0.0);
    DecimalFormat formatter = new DecimalFormat("0.000");

    double[] admissibleValues = null;
    double lowerBound = -Double.MAX_VALUE;
    double upperBound = Double.MAX_VALUE;
    
    public JNumberField() {
        super();
        this.addActionListener(this);
    }

    public JNumberField(double value, String format, ActionListener actionListener) {
        super();
        formatter = new DecimalFormat(format);
        this.addActionListener(actionListener);
        this.addActionListener(this);
        setValue(value);
    }

    public JNumberField(double value, DecimalFormat format, ActionListener actionListener) {
        super();
        formatter = format;
        this.addActionListener(actionListener);
        this.addActionListener(this);
        setValue(value);
    }
    
    public JNumberField(String format) {
        super(format);
        formatter = new DecimalFormat(format);
        this.addActionListener(this);
        setValue(0.0);
    }

    public Number getValue() {
    	parseField();
    	updateData();
        return value;
    }

    public void setValue(double value) {
    	this.value = value;
        updateData();
    }
   
    public void setFromat(String format) {
        formatter = new DecimalFormat(format);
        updateData();
    }

    public void setRange(double lowerBound, double upperBound) {
    	this.lowerBound = lowerBound;
    	this.upperBound = upperBound;
    	parseField();
    	updateData();
    }

	public void setAdmissibleValues(double[] admissibleValues) {
		this.admissibleValues = admissibleValues;
	}
	
    public void add(double increment) {
        setValue(getDoubleValue() + increment);
    }
    
    public void addToAdmissibleValueIndex(int increment) {
        int index = getAdmissibleValueIndex();
        if(index < 0) return;	// Admissible values not set
        	
        index = Math.max(0,Math.min(index + increment, admissibleValues.length-1));
        value = admissibleValues[index];
        
    	updateData();
    }

    public double getDoubleValue() {
        return getValue().doubleValue();
    }

    public int getIntValue() {
        return getValue().intValue();
     }

    @Override
    public void actionPerformed(ActionEvent arg0) {
    	parseField();
    	updateData();
    }

    private void parseField() {
    	// Parse field
        try {
            setValue(formatter.parse(this.getText()).doubleValue());
        } catch (ParseException e) {
            // Reset field to previous value
            if(value != null) setValue(value.doubleValue());
            else			  setValue(0.0);
        }
	}

    private void updateData() {
    	if(value == null) parseField();

    	// Constrain to admissibleValues
        int index = getAdmissibleValueIndex();
        if(index >= 0) value = admissibleValues[index];

    	// Apply bounds
        this.value = new Double(Math.min(Math.max(lowerBound,value.doubleValue()),upperBound));

        // Write and resize field
        this.setText(formatter.format(value));

        if(lowerBound != -Double.MAX_VALUE && upperBound != Double.MAX_VALUE)	this.setColumns(1+Math.max(formatter.format(lowerBound).length(), formatter.format(upperBound).length()));
        else																	this.setColumns(1+this.getText().length());        
	}
    
    private int getAdmissibleValueIndex() {
    	// Constrain to admissibleValues
    	if(this.admissibleValues != null && admissibleValues.length > 0) {
    		int index = java.util.Arrays.binarySearch(admissibleValues, value.doubleValue());
    		if(index < 0) index = -index-1;
    		if(index > admissibleValues.length) index--;
    		return index;
    	}
    	else return -1;    	
    }
}