001// Copyright 2007, 2008 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.tapestry5.validator; 016 017import org.apache.tapestry5.Field; 018import org.apache.tapestry5.MarkupWriter; 019import org.apache.tapestry5.ValidationException; 020import org.apache.tapestry5.ioc.MessageFormatter; 021import org.apache.tapestry5.services.FormSupport; 022 023/** 024 * Validates that a string value has a minimum length. 025 */ 026public final class MinLength extends AbstractValidator<Integer, String> 027{ 028 public MinLength() 029 { 030 super(Integer.class, String.class, "minimum-string-length"); 031 } 032 033 public void validate(Field field, Integer constraintValue, MessageFormatter formatter, String value) 034 throws ValidationException 035 { 036 if (value.length() < constraintValue) 037 throw new ValidationException(buildMessage(formatter, field, constraintValue)); 038 } 039 040 private String buildMessage(MessageFormatter formatter, Field field, Integer constraintValue) 041 { 042 return formatter.format(constraintValue, field.getLabel()); 043 } 044 045 public void render(Field field, Integer constraintValue, MessageFormatter formatter, MarkupWriter writer, 046 FormSupport formSupport) 047 { 048 formSupport.addValidation(field, "minlength", buildMessage(formatter, field, constraintValue), constraintValue); 049 } 050}