org.eclipse.riena.ui.ridgets.validation.ValidEmailAddress.java Source code

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Here is the source code for org.eclipse.riena.ui.ridgets.validation.ValidEmailAddress.java

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/*******************************************************************************
 * Copyright (c) 2007, 2013 compeople AG and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    compeople AG - initial API and implementation
 *******************************************************************************/
package org.eclipse.riena.ui.ridgets.validation;

import org.apache.commons.validator.GenericValidator;

import org.eclipse.core.databinding.validation.IValidator;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.osgi.util.NLS;

import org.eclipse.riena.ui.ridgets.nls.Messages;

/**
 * Implementation for a email address validation. This rule accepts any String
 * which is either <tt>null</tt>, empty, all whitespace or a valid email
 * address.
 * <p>
 * If the rule fails it will prevent updating the ridget and model values. The
 * rule will not block invalid input to the widget.
 */
public class ValidEmailAddress implements IValidator {

    public IStatus validate(final Object value) {
        if (value == null) {
            return ValidationRuleStatus.ok();
        }
        // note: null instanceof String == false
        if (!(value instanceof String)) {
            throw new ValidationFailure(getClass().getSimpleName() + " can only validate objects of type " //$NON-NLS-1$
                    + String.class.getName());
        }
        final String toBeChecked = (String) value;
        if (toBeChecked.length() == 0 || GenericValidator.isEmail(toBeChecked)) {
            return ValidationRuleStatus.ok();
        }
        final String message = NLS.bind(Messages.ValidEmailAddress_error_notValid, toBeChecked);
        return ValidationRuleStatus.error(false, message);
    }

    @Override
    public String toString() {
        final StringBuilder buffer = new StringBuilder(this.getClass().getSimpleName());
        return buffer.toString();
    }

}