001// Copyright 2007 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.internal.beaneditor; 016 017import org.apache.tapestry5.services.ValidationConstraintGenerator; 018import org.apache.tapestry5.services.Environment; 019import org.apache.tapestry5.services.PropertyEditContext; 020import org.apache.tapestry5.ioc.AnnotationProvider; 021import org.apache.tapestry5.ioc.Messages; 022import org.apache.tapestry5.ioc.internal.util.InternalUtils; 023 024import java.util.List; 025import java.util.Arrays; 026import java.util.regex.Pattern; 027 028/** 029 * Generates constraints from the containing component's property file. 030 * Looks for a key in the form: propertyId-validate. 031 * 032 */ 033public class MessagesConstraintGenerator implements ValidationConstraintGenerator 034{ 035 036 private final Environment environment; 037 private final String format="%s-validate"; 038 private final Pattern splitPattern; 039 040 public MessagesConstraintGenerator(final Environment environment) { 041 this.environment = environment; 042 splitPattern = Pattern.compile(ValidateAnnotationConstraintGenerator.VALIDATOR_PATTERN); 043 } 044 045 public List<String> buildConstraints(Class propertyType, AnnotationProvider annotationProvider) 046 { 047 EnvironmentMessages environmentMessages = environment.peek(EnvironmentMessages.class); 048 if (environmentMessages == null) { 049 return null; 050 } 051 052 String key = String.format(format,environmentMessages.getOverrideId()); 053 Messages m = environmentMessages.getMessages(); 054 if (!m.contains(key)) 055 { 056 return null; 057 } 058 059 String result = m.get(key); 060 if (InternalUtils.isBlank(result)) 061 { 062 return null; 063 } 064 return Arrays.asList(splitPattern.split(result)); 065 } 066}