at.reisisoft.jku.ce.adaptivelearning.vaadin.input.CurrencyTextBox.java Source code

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Here is the source code for at.reisisoft.jku.ce.adaptivelearning.vaadin.input.CurrencyTextBox.java

Source

package at.reisisoft.jku.ce.adaptivelearning.vaadin.input;

/*This file is part of the project "Reisisoft Adaptive Testing",
 * which is licenced under LGPL v3+. You may find a copy in the source,
 * or obtain one at http://www.gnu.org/licenses/lgpl-3.0-standalone.html */
import java.util.ArrayList;
import java.util.List;

import com.vaadin.event.FieldEvents.TextChangeEvent;
import com.vaadin.event.FieldEvents.TextChangeListener;
import com.vaadin.ui.TextField;

public class CurrencyTextBox extends TextField implements TextChangeListener {

    private static final long serialVersionUID = 1535274733192320364L;
    private final List<ValidValueChangedListener<Float>> validValueChangedListeners = new ArrayList<>();
    private float value = 0f;
    private String lastValue = "0";
    private final String regexNumber_DotSep = "^([0-9]{1,3}(((,[0-9]{3}){0,})|[0-9]{0,}))?(\\.[0-9]{1,2})?$",
            regexNumber_ColonSep = "^([0-9]{1,3}(((\\.[0-9]{3}){0,})|[0-9]{0,}))?(,[0-9]{1,2})?$";

    public CurrencyTextBox() {
        addTextChangeListener(this);
        setTextChangeEventMode(TextChangeEventMode.LAZY);
    }

    public void addListener(ValidValueChangedListener<Float> listener) {
        validValueChangedListeners.add(listener);
    }

    public void removeListener(ValidValueChangedListener<Float> listener) {
        validValueChangedListeners.remove(listener);
    }

    public float getNumericValue() {
        return value;
    }

    private void fireValidValueChangedListener() {
        Float f = value;
        for (ValidValueChangedListener<Float> validValueChangedListener : validValueChangedListeners) {
            validValueChangedListener.accept(f);
        }
    }

    @Override
    public void textChange(TextChangeEvent event) {
        String newInput = event.getText();
        if (isValidNumber(newInput)) {
            String v;
            if (newInput.length() == 0) {
                v = "0";
            } else if (newInput.matches(regexNumber_ColonSep)) {
                v = newInput.replace(".", "").replace(',', '.');
            } else {
                v = newInput.replace(",", "");
            }
            value = Float.parseFloat(v);
            lastValue = newInput;
            fireValidValueChangedListener();
        } else {
            setValue(lastValue);
        }

    }

    private boolean isValidNumber(String s) {
        // A number must not be NULL
        if (s == null) {
            return false;
        }
        // Ensure the number is valid
        return s.length() == 0 || s.matches(regexNumber_ColonSep) || s.matches(regexNumber_DotSep);
    }
}