001 // Copyright 2005 The Apache Software Foundation 002 // 003 // Licensed under the Apache License, Version 2.0 (the "License"); 004 // you may not use this file except in compliance with the License. 005 // You may obtain a copy of the License at 006 // 007 // http://www.apache.org/licenses/LICENSE-2.0 008 // 009 // Unless required by applicable law or agreed to in writing, software 010 // distributed under the License is distributed on an "AS IS" BASIS, 011 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012 // See the License for the specific language governing permissions and 013 // limitations under the License. 014 015 package org.apache.tapestry.form.validator; 016 017 import org.apache.tapestry.IMarkupWriter; 018 import org.apache.tapestry.IRequestCycle; 019 import org.apache.tapestry.TapestryUtils; 020 import org.apache.tapestry.form.FormComponentContributorContext; 021 import org.apache.tapestry.form.IFormComponent; 022 import org.apache.tapestry.form.ValidationMessages; 023 import org.apache.tapestry.util.RegexpMatcher; 024 import org.apache.tapestry.valid.ValidationConstraint; 025 import org.apache.tapestry.valid.ValidationStrings; 026 import org.apache.tapestry.valid.ValidatorException; 027 028 /** 029 * Validates that the user input, a string, is an email address (by checking it against a regular 030 * expression). 031 * 032 * @author Howard Lewis Ship 033 * @since 4.0 034 */ 035 public class Email extends BaseValidator 036 { 037 static final String PATTERN = "^\\w[-._\\w]*\\w@\\w[-._\\w]*\\w\\.\\w{2,6}$"; 038 039 // TODO: Possible thread safety issue if the validator 040 // is shared across threads, because the matcher 041 // will be too. 042 private RegexpMatcher _matcher = new RegexpMatcher(); 043 044 public Email() 045 { 046 } 047 048 public Email(String initializer) 049 { 050 super(initializer); 051 } 052 053 public void validate(IFormComponent field, ValidationMessages messages, Object object) 054 throws ValidatorException 055 { 056 String input = (String) object; 057 058 if (!_matcher.matches(PATTERN, input)) 059 throw new ValidatorException(buildMessage(messages, field), 060 ValidationConstraint.EMAIL_FORMAT); 061 } 062 063 private String buildMessage(ValidationMessages messages, IFormComponent field) 064 { 065 return messages.formatValidationMessage( 066 getMessage(), 067 ValidationStrings.INVALID_EMAIL, 068 new Object[] 069 { field.getDisplayName() }); 070 } 071 072 public void renderContribution(IMarkupWriter writer, IRequestCycle cycle, 073 FormComponentContributorContext context, IFormComponent field) 074 { 075 context.includeClasspathScript("/org/apache/tapestry/form/validator/RegExValidator.js"); 076 077 String pattern = _matcher.getEscapedPatternString(PATTERN); 078 String message = TapestryUtils.enquote(buildMessage(context, field)); 079 080 StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_regex(event, '"); 081 buffer.append(field.getClientId()); 082 buffer.append("', '"); 083 buffer.append(pattern); 084 buffer.append("', "); 085 buffer.append(message); 086 buffer.append("); }"); 087 088 context.addSubmitHandler(buffer.toString()); 089 } 090 }