001 /**
002 * Copyright (C) 2009-2011 the original author or authors.
003 * See the notice.md file distributed with this work for additional
004 * information regarding copyright ownership.
005 *
006 * Licensed under the Apache License, Version 2.0 (the "License");
007 * you may not use this file except in compliance with the License.
008 * You may obtain a copy of the License at
009 *
010 * http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018
019 package org.fusesource.restygwt.rebind;
020
021 import java.util.ArrayList;
022 import java.util.List;
023
024 import com.google.gwt.core.ext.BadPropertyValueException;
025 import com.google.gwt.core.ext.GeneratorContext;
026 import com.google.gwt.core.ext.TreeLogger;
027
028 /**
029 * compile-time defaults
030 *
031 * with this class it will be possible to take part of the generation process of restserviceimpl
032 * classes. by default there are no additional resolvers registered, you can add some if wanted.
033 *
034 * @see http://code.google.com/p/google-web-toolkit/wiki/MultiValuedConfigProperties
035 * @author abalke
036 *
037 */
038 public class BindingDefaults {
039 /**
040 * additional AnnotationResolvers, added by {@link #addAnnotationResolver(AnnotationResolver)}
041 */
042 private static final List<AnnotationResolver> annotationResolvers = new ArrayList<AnnotationResolver>();
043
044 /**
045 * to avoid returning different Sets of AnnotationResolvers by false
046 * usage, the return of the first call to {@link #getAnnotationResolvers()}
047 * is cached here.
048 *
049 * if there will be a call to {@link #addAnnotationResolver(AnnotationResolver)} after
050 * that first call, we will throw a runtime exception to avoid nasty bugs.
051 */
052 private static List<AnnotationResolver> _annotationResolversRequested = null;
053
054 /**
055 * access all annotationresolvers that are registered
056 *
057 * @return a copy of all AnnotationResolvers
058 */
059 public static List<AnnotationResolver> getAnnotationResolvers(final GeneratorContext context,
060 final TreeLogger logger) {
061
062 // do this only the first time call
063 if(null == _annotationResolversRequested) {
064 // call additional AnnotationResolvers if there are some configured
065 try {
066 for (String className : context.getPropertyOracle()
067 .getConfigurationProperty("org.fusesource.restygwt.annotationresolver").getValues()) {
068 logger.log(TreeLogger.INFO, "classname to resolve: " + className);
069 Class<?> clazz = null;
070
071 try {
072 clazz = Class.forName(className);
073 } catch (ClassNotFoundException e) {
074 new RuntimeException("could not resolve class " + className + " "
075 + e.getMessage());
076 }
077
078 if (null != clazz) {
079 try {
080 logger.log(TreeLogger.INFO, "add annotationresolver: " + clazz.getName());
081 addAnnotationResolver((AnnotationResolver) clazz.newInstance());
082 } catch (InstantiationException e) {
083 new RuntimeException("could not instanciate class " + className + " "
084 + e.getMessage());
085 } catch (IllegalAccessException e) {
086 new RuntimeException("could not access class " + className + " "
087 + e.getMessage());
088 }
089 } else {
090 throw new RuntimeException("could not create instance for classname " + className);
091 }
092 }
093 } catch (BadPropertyValueException ignored) {
094 /*
095 * ignored since there is no
096 *
097 * <set-configuration-property name="org.fusesource.restygwt.annotationresolver"
098 * value="org.fusesource.restygwt.rebind.ModelChangeAnnotationResolver"/>
099 */
100 logger.log(TreeLogger.DEBUG, "no additional annotationresolvers found");
101 }
102 }
103
104 // return a copy
105 List<AnnotationResolver> ret = new ArrayList<AnnotationResolver>();
106
107 for (AnnotationResolver a : annotationResolvers) {
108 ret.add(a);
109 }
110 return _annotationResolversRequested = ret;
111 }
112
113 /**
114 * access all annotationresolvers that are registered
115 *
116 * @return
117 */
118 public static void addAnnotationResolver(AnnotationResolver ar) {
119 if (_annotationResolversRequested != null) {
120 throw new RuntimeException("Sorry, you cannot add more AnnotationResolver instances after the first time " +
121 "`BindingDefaults#getAnnotationResolvers´ has been called. please check your runtime logic.");
122 }
123 annotationResolvers.add(ar);
124 }
125 }