org.apache.bval.constraints.NotEmptyValidator Maven / Gradle / Ivy
/*
* 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 org.apache.bval.constraints;
import javax.validation.ConstraintValidator;
import javax.validation.ConstraintValidatorContext;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
/**
* Description: Check the non emptyness of an
* any object that has a public isEmpty():boolean or a valid toString() method
*/
public class NotEmptyValidator implements ConstraintValidator {
public void initialize(NotEmpty constraintAnnotation) {
// do nothing
}
public boolean isValid(Object value, ConstraintValidatorContext context) {
if (value == null) return true;
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 iae) {
// do nothing
} catch (NoSuchMethodException nsme) {
// do nothing
} catch (InvocationTargetException ite) {
// do nothing
}
return value.toString().length() > 0;
}
}
}