NotEmptyValidatorForCollection.java

/*
 * Copyright [2014] [Christian Loehnert, krampenschiesser@gmail.com]
 * 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 de.ks.validation.contraints;

import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.util.Collection;

public class NotEmptyValidatorForCollection implements ConstraintValidator<NotEmpty, Collection<?>> {
  public void initialize(NotEmpty constraintAnnotation) {
    // do nothing
  }

  public boolean isValid(Collection<?> value, ConstraintValidatorContext context) {
    return value == null || !value.isEmpty();
  }
}