nl.knaw.dans.common.wicket.util.LettersAndDigitsValidator.java Source code

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Here is the source code for nl.knaw.dans.common.wicket.util.LettersAndDigitsValidator.java

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/*******************************************************************************
 * Copyright 2015 DANS - Data Archiving and Networked Services
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *  
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package nl.knaw.dans.common.wicket.util;

import org.apache.wicket.validation.validator.PatternValidator;

public class LettersAndDigitsValidator extends PatternValidator {

    public static final String PATTERN = "([A-Za-z0-9]+)";

    private static final long serialVersionUID = -3770482697068448009L;

    private static LettersAndDigitsValidator instance;

    public static LettersAndDigitsValidator instance() {
        if (instance == null) {
            instance = new LettersAndDigitsValidator();
        }
        return instance;
    }

    private LettersAndDigitsValidator() {
        super(PATTERN);
    }

}