com.opensymphony.xwork2.validator.validators.RequiredFieldValidator 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 com.opensymphony.xwork2.validator.validators;
import com.opensymphony.xwork2.validator.ValidationException;
import java.lang.reflect.Array;
import java.util.Collection;
/**
*
* RequiredFieldValidator checks if the specified field is not null.
*
*
*
*
* - fieldName - field name if plain-validator syntax is used, not needed if field-validator syntax is used
*
*
*
*
*
* <validators>
*
* <!-- Plain Validator Syntax -->
* <validator type="required">
* <param name="fieldName">username</param>
* <message>username must not be null</message>
* </validator>
*
*
* <!-- Field Validator Syntax -->
* <field name="username">
* <field-validator type="required">
* <message>username must not be null</message>
* </field-validator>
* </field>
*
* </validators>
*
*
*
*
*
* @author rainerh
*/
public class RequiredFieldValidator extends FieldValidatorSupport {
public void validate(Object object) throws ValidationException {
String fieldName = getFieldName();
Object value = this.getFieldValue(fieldName, object);
if (value == null) {
addFieldError(fieldName, object);
} else if (value.getClass().isArray() && Array.getLength(value) == 0) {
addFieldError(fieldName, object);
} else if (Collection.class.isAssignableFrom(value.getClass()) && ((Collection) value).size() == 0) {
addFieldError(fieldName, object);
}
}
}