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'rapiddweller Common' is an open source Java library forked from Databene Commons by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * 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 com.rapiddweller.common.validator;

import com.rapiddweller.common.Converter;
import com.rapiddweller.common.Validator;
import com.rapiddweller.common.converter.SubstringExtractor;

/**
 * Uses another validator to validate sub strings.
 * Created: 02.08.2011 07:19:04
 *
 * @author Volker Bergmann
 * @since 0.5.9
 */
public class SubStringValidator extends AbstractValidator {

  /**
   * The Substring extractor.
   */
  protected Converter substringExtractor;
  /**
   * The Real validator.
   */
  protected Validator realValidator;

  /**
   * Instantiates a new Sub string validator.
   *
   * @param from          the from
   * @param to            the to
   * @param realValidator the real validator
   */
  public SubStringValidator(int from, Integer to, Validator realValidator) {
    this.substringExtractor = new SubstringExtractor(from, to);
    this.realValidator = realValidator;
  }


  @Override
  public boolean valid(String value) {
    if (value == null) {
      return false;
    }
    return realValidator.valid(substringExtractor.convert(value));
  }

}