Struts example source code file (URLValidator.java)

This example Struts source code file (URLValidator.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Struts tags/keywords

fieldvalidatorsupport, object, object, string, string, urlvalidator, urlvalidator, validationexception, validationexception

The Struts URLValidator.java source code

/*
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * 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 com.opensymphony.xwork2.validator.validators;

import com.opensymphony.xwork2.validator.ValidationException;
import com.opensymphony.xwork2.util.URLUtil;


/**
 * <!-- START SNIPPET: javadoc -->
 * 
 * URLValidator checks that a given field is a String and a valid URL
 * 
 * <!-- END SNIPPET: javadoc -->
 * 
 * <p/>
 * 
 * <!-- START SNIPPET: parameters -->
 * 
 * <ul>
 * 		<li>fieldName - The field name this validator is validating. Required if using Plain-Validator Syntax otherwise not required
 * </ul>
 * 
 * <!-- END SNIPPET: parameters -->
 *
 * <p/>
 *
 * <pre>
 * <!-- START SNIPPET: examples -->
 * 
 *     <validators>
 *          <!-- Plain Validator Syntax -->
 *          <validator type="url">
 *              <param name="fieldName">myHomePage</param>
 *              <message>Invalid homepage url</message>
 *          </validator>
 *          
 *          <!-- Field Validator Syntax -->
 *          <field name="myHomepage">
 *              <message>Invalid homepage url</message>
 *          </field>
 *     </validators>
 *     
 * <!-- END SNIPPET: examples -->
 * </pre>
 *
 *
 * @author $Author: martinc $
 * @version $Date: 2009-12-27 19:18:29 +0100 (Sun, 27 Dec 2009) $ $Revision: 894090 $
 */
public class URLValidator extends FieldValidatorSupport {

    public void validate(Object object) throws ValidationException {
        String fieldName = getFieldName();
        Object value = this.getFieldValue(fieldName, object);

        // if there is no value - don't do comparison
        // if a value is required, a required validator should be added to the field
        if (value == null || value.toString().length() == 0) {
            return;
        }

        if (!(value.getClass().equals(String.class)) || !URLUtil.verifyUrl((String) value)) {
            addFieldError(fieldName, object);
        }
    }
}