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.valid.ValidationConstraint; 024 import org.apache.tapestry.valid.ValidationStrings; 025 import org.apache.tapestry.valid.ValidatorException; 026 027 /** 028 * Validates that the value, a string, is of a minimum length. 029 * 030 * @author Howard Lewis Ship 031 * @since 4.0 032 */ 033 public class MinLength extends BaseValidator 034 { 035 private int _minLength; 036 037 public MinLength() 038 { 039 } 040 041 public MinLength(String initializer) 042 { 043 super(initializer); 044 } 045 046 public void setMinLength(int minLength) 047 { 048 _minLength = minLength; 049 } 050 051 public int getMinLength() 052 { 053 return _minLength; 054 } 055 056 public void validate(IFormComponent field, ValidationMessages messages, Object object) 057 throws ValidatorException 058 { 059 String string = (String) object; 060 061 if (string.length() < _minLength) 062 throw new ValidatorException(buildMessage(messages, field), 063 ValidationConstraint.MINIMUM_WIDTH); 064 } 065 066 protected String buildMessage(ValidationMessages messages, IFormComponent field) 067 { 068 return messages.formatValidationMessage( 069 getMessage(), 070 ValidationStrings.VALUE_TOO_SHORT, 071 new Object[] 072 { new Integer(_minLength), field.getDisplayName() }); 073 } 074 075 public void renderContribution(IMarkupWriter writer, IRequestCycle cycle, 076 FormComponentContributorContext context, IFormComponent field) 077 { 078 context.includeClasspathScript("/org/apache/tapestry/form/validator/StringValidator.js"); 079 080 StringBuffer buffer = new StringBuffer("function(event) { Tapestry.validate_min_length(event, '"); 081 buffer.append(field.getClientId()); 082 buffer.append("', "); 083 buffer.append(_minLength); 084 buffer.append(", "); 085 buffer.append(TapestryUtils.enquote(buildMessage(context, field))); 086 buffer.append("); }"); 087 088 context.addSubmitHandler(buffer.toString()); 089 } 090 }