/*
* 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.lang.reflect.Array;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
public class NotEmptyValidator implements ConstraintValidator<NotEmpty, Object> {
public void initialize(NotEmpty constraintAnnotation) {
// do nothing
}
public boolean isValid(Object value, ConstraintValidatorContext context) {
if (value == null) {
return false;
}
if (value.getClass().isArray()) {
return Array.getLength(value) > 0;
} else {
try {
Method isEmptyMethod = value.getClass().getMethod("isEmpty");
if (isEmptyMethod != null) {
return !((Boolean) isEmptyMethod.invoke(value)).booleanValue();
}
} catch (IllegalAccessException | NoSuchMethodException | InvocationTargetException iae) {
// do nothing
}
return value.toString().length() > 0;
}
}
}