AbstractConstraintValidator.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 net.formio.validation.constraints;

import java.lang.annotation.Annotation;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

/**
 * Abstract base implementation of constraint validator.
 * @author Radek Beran
 * @param <T>
 */
public abstract class AbstractConstraintValidator<A extends Annotation> implements ConstraintValidator<A, String> {

	@Override
	public void initialize(A constraintAnnotation) {
		// no inicialization required
	}

	@Override
	public boolean isValid(String input, ConstraintValidatorContext ctx) {
        if (input == null || input.isEmpty()) return true;
        return isValidFilledInput(input);
    }
	
	protected abstract boolean isValidFilledInput(String input);

}