org.smallmind.nutsnbolts.validation.NotEmptyValidator Maven / Gradle / Ivy

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/*
 * Copyright (c) 2007 through 2024 David Berkman
 *
 * This file is part of the SmallMind Code Project.
 *
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 *
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 *
 * ...or...
 *
 * 2) The terms of the Apache License, Version 2.0.
 *
 * The SmallMind Code Project 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 or Apache License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 *
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.nutsnbolts.validation;

import java.lang.reflect.Array;
import java.util.Collection;
import java.util.Map;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;

public class NotEmptyValidator implements ConstraintValidator {

  private NotEmpty constraintAnnotation;

  @Override
  public void initialize (NotEmpty constraintAnnotation) {

    this.constraintAnnotation = constraintAnnotation;
  }

  @Override
  public boolean isValid (Object value, ConstraintValidatorContext context) {

    if (value == null) {
      return true;
    } else if (value.getClass().isArray()) {
      return Array.getLength(value) > 0;
    } else if (Collection.class.isAssignableFrom(value.getClass())) {
      return !((Collection)value).isEmpty();
    } else if (Map.class.isAssignableFrom(value.getClass())) {
      return !((Map)value).isEmpty();
    } else {
      return false;
    }
  }
}