de.catma.ui.data.util.IntegerValueValidator.java Source code

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Here is the source code for de.catma.ui.data.util.IntegerValueValidator.java

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/*   
 *   CATMA Computer Aided Text Markup and Analysis
 *   
 *   Copyright (C) 2009-2013  University Of Hamburg
 *
 *   This program is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package de.catma.ui.data.util;

import com.vaadin.data.Validator;

public class IntegerValueValidator implements Validator {

    private boolean allowZero;
    private boolean allowNegative;

    public IntegerValueValidator() {
        this(true, true);
    }

    public IntegerValueValidator(boolean allowZero, boolean allowNegative) {
        this.allowZero = allowZero;
        this.allowNegative = allowNegative;
    }

    public boolean isValid(Object value) {
        try {
            if (value == null) {
                return false;
            }

            int intVal = Integer.valueOf(value.toString());
            if (!allowZero && intVal == 0) {
                return false;
            }
            if (!allowNegative && (intVal < 0)) {
                return false;
            }

            return true;
        } catch (NumberFormatException nfe) {
            return false;
        }
    }

    public void validate(Object value) throws InvalidValueException {
        if (!isValid(value)) {
            StringBuilder builder = new StringBuilder("The value has to be a");

            if (!allowZero) {
                if (allowNegative) {
                    builder.append(" non zero integer");
                } else {
                    builder.append("n integer greater than zero");
                }
            } else {
                if (allowNegative) {
                    builder.append("n integer");
                } else {
                    builder.append("n integer value greater or equal zero");
                }
            }
            builder.append("!");

            throw new InvalidValueException(builder.toString());
        }
    }
}