001 /*
002 * Copyright 2010-2013 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 * http://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017 package org.codehaus.griffon.runtime.core.resources;
018
019 import griffon.core.resources.NoSuchResourceException;
020 import griffon.core.resources.ResourceResolver;
021
022 import java.util.List;
023 import java.util.Locale;
024
025 /**
026 * @author Andres Almiray
027 * @since 1.1.0
028 */
029 public class CompositeResourceResolver extends AbstractResourceResolver {
030 private final ResourceResolver[] resourceResolvers;
031
032 public CompositeResourceResolver(List<ResourceResolver> resourceResolvers) {
033 this(toResourceResolverArray(resourceResolvers));
034 }
035
036 public CompositeResourceResolver(ResourceResolver[] resourceResolvers) {
037 this.resourceResolvers = resourceResolvers;
038 }
039
040 private static ResourceResolver[] toResourceResolverArray(List<ResourceResolver> resourceResolvers) {
041 if (null == resourceResolvers || resourceResolvers.isEmpty()) {
042 return new ResourceResolver[0];
043 }
044 return resourceResolvers.toArray(new ResourceResolver[resourceResolvers.size()]);
045 }
046
047 public Object resolveResource(String key, Object defaultValue) {
048 return resolveResourceInternal(key, EMPTY_OBJECT_ARGS, defaultValue, Locale.getDefault());
049 }
050
051 public Object resolveResource(String key, Object defaultValue, Locale locale) {
052 return resolveResourceInternal(key, EMPTY_OBJECT_ARGS, defaultValue, locale);
053 }
054
055 public Object resolveResource(String key, Object[] args, Object defaultValue) {
056 return resolveResourceInternal(key, args, defaultValue, Locale.getDefault());
057 }
058
059 public Object resolveResource(String key, Object[] args, Object defaultValue, Locale locale) {
060 return resolveResourceInternal(key, args, defaultValue, locale);
061 }
062
063 public Object resolveResource(String key, List args, Object defaultValue) {
064 return resolveResourceInternal(key, toObjectArray(args), defaultValue, Locale.getDefault());
065 }
066
067 public Object resolveResource(String key, List args, Object defaultValue, Locale locale) {
068 return resolveResourceInternal(key, toObjectArray(args), defaultValue, locale);
069 }
070
071 public Object resolveResourceInternal(String key, Locale locale) {
072 if (null == locale) locale = Locale.getDefault();
073 for (ResourceResolver resourceResolver : resourceResolvers) {
074 try {
075 if (resourceResolver instanceof AbstractResourceResolver) {
076 return ((AbstractResourceResolver) resourceResolver).resolveResourceInternal(key, locale);
077 }
078 return resourceResolver.resolveResource(key, locale);
079 } catch (NoSuchResourceException nsme) {
080 // ignore
081 }
082 }
083 throw new NoSuchResourceException(key, locale);
084 }
085
086 private Object resolveResourceInternal(String key, Object[] args, Locale locale) throws NoSuchResourceException {
087 if (null == locale) locale = Locale.getDefault();
088 for (ResourceResolver resourceResolver : resourceResolvers) {
089 try {
090 return resourceResolver.resolveResource(key, args, locale);
091 } catch (NoSuchResourceException nsme) {
092 // ignore
093 }
094 }
095 throw new NoSuchResourceException(key, locale);
096 }
097
098 private Object resolveResourceInternal(String key, Object[] args, Object defaultValue, Locale locale) {
099 try {
100 return resolveResourceInternal(key, args, locale);
101 } catch (NoSuchResourceException nsme) {
102 // ignore
103 }
104 return defaultValue;
105 }
106 }
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