Application: gvSIG desktop » Library: org.gvsig.tools

package org.gvsig.tools.swing.api.documentfilters;

import java.awt.Color;

import javax.swing.JTextField;

import javax.swing.text.AttributeSet;

import javax.swing.text.BadLocationException;

import javax.swing.text.Document;

import javax.swing.text.DocumentFilter;

import javax.swing.text.PlainDocument;

import org.apache.commons.lang3.StringUtils;

/**

 *

 * @author jjdelcerro

 */

public class DoubleDocumentFilter extends DocumentFilter {

    public static void install(JTextField text) {

        Document doc = text.getDocument();

        if (doc instanceof PlainDocument) {

            ((PlainDocument) doc).setDocumentFilter(new DoubleDocumentFilter(text));

        }

    }

    public static double getValue(JTextField text) {

        String s = text.getText();

        if( StringUtils.isEmpty(s) ) {

            return Double.NaN;

        }

        try {

            double n = Double.parseDouble(s);

            return n;

        } catch (Exception ex) {

            return Double.NaN;

        }

    }    

    public static boolean isValid(JTextField text) {

        String s = text.getText();

        if( StringUtils.isEmpty(s) ) {

            return true;

        }

        try {

            double n = Double.parseDouble(s);

            return true;

        } catch (Exception ex) {

            return false;

        }

    }    

    public static boolean isEmpty(JTextField text) {

        String s = text.getText();

        if( StringUtils.isEmpty(s) ) {

            return true;

        }

        try {

            double n = Double.parseDouble(s);

            return false;

        } catch (Exception ex) {

            return true;

        }

    }    

    private final JTextField text;

    private final Color backgroundOk;

    private final Color backgroundErr;

    public DoubleDocumentFilter(JTextField text) {

        this.text = text;

        this.backgroundOk = text.getBackground();

        this.backgroundErr = Color.red.brighter();

    }

    private boolean test(String text) {

        try {

            Double.parseDouble(text);

            return true;

        } catch (NumberFormatException e) {

            return false;

        }

    }

    @Override

    public void insertString(FilterBypass fb, int offset, String string,

            AttributeSet attr) throws BadLocationException {

        super.insertString(fb, offset, string, attr);

        String s = this.text.getText();

        if( test(s) ) {

            this.text.setBackground(this.backgroundOk);

        } else {

            this.text.setBackground(this.backgroundErr);

        }

    }

    @Override

    public void replace(FilterBypass fb, int offset, int length, String text,

            AttributeSet attrs) throws BadLocationException {

        super.replace(fb, offset, length, text, attrs);

        String s = this.text.getText();

        if( test(s) ) {

            this.text.setBackground(this.backgroundOk);

        } else {

            this.text.setBackground(this.backgroundErr);

        }

    }

    @Override

    public void remove(FilterBypass fb, int offset, int length)

            throws BadLocationException {

        super.remove(fb, offset, length);

        String s = this.text.getText();

        if( test(s) ) {

            this.text.setBackground(this.backgroundOk);

        } else {

            this.text.setBackground(this.backgroundErr);

        }

    }

}