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 015package org.apache.tapestry.form.validator; 016 017import org.apache.tapestry.IMarkupWriter; 018import org.apache.tapestry.IRequestCycle; 019import org.apache.tapestry.TapestryUtils; 020import org.apache.tapestry.form.FormComponentContributorContext; 021import org.apache.tapestry.form.IFormComponent; 022import org.apache.tapestry.form.ValidationMessages; 023import org.apache.tapestry.valid.ValidationConstraint; 024import org.apache.tapestry.valid.ValidationStrings; 025import org.apache.tapestry.valid.ValidatorException; 026 027/** 028 * Validator that ensures a string value does not exceed a maximum length. 029 * 030 * @author Howard Lewis Ship 031 * @since 4.0 032 */ 033public class MaxLength extends BaseValidator 034{ 035 private int _maxLength; 036 037 public MaxLength() 038 { 039 040 } 041 042 public MaxLength(String initializer) 043 { 044 super(initializer); 045 } 046 047 public void setMaxLength(int maxLength) 048 { 049 _maxLength = maxLength; 050 } 051 052 public void validate(IFormComponent field, ValidationMessages messages, Object object) 053 throws ValidatorException 054 { 055 String string = (String) object; 056 057 if (string.length() > _maxLength) 058 throw new ValidatorException(buildMessage(messages, field), 059 ValidationConstraint.MAXIMUM_WIDTH); 060 } 061 062 protected String buildMessage(ValidationMessages messages, IFormComponent field) 063 { 064 return messages.formatValidationMessage( 065 getMessage(), 066 ValidationStrings.VALUE_TOO_LONG, 067 new Object[] 068 { new Integer(_maxLength), field.getDisplayName() }); 069 } 070 071 public void renderContribution(IMarkupWriter writer, IRequestCycle cycle, 072 FormComponentContributorContext context, IFormComponent field) 073 { 074 context.includeClasspathScript("/org/apache/tapestry/form/validator/StringValidator.js"); 075 076 StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_max_length(event, '"); 077 buffer.append(field.getClientId()); 078 buffer.append("', "); 079 buffer.append(_maxLength); 080 buffer.append(", "); 081 buffer.append(TapestryUtils.enquote(buildMessage(context, field))); 082 buffer.append("); }"); 083 084 context.addSubmitHandler(buffer.toString()); 085 } 086 087}