001/*
002 * Copyright 2002-2018 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 *      https://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
017package org.springframework.jdbc.config;
018
019import java.io.IOException;
020import java.util.ArrayList;
021import java.util.Arrays;
022import java.util.List;
023
024import org.springframework.beans.factory.FactoryBean;
025import org.springframework.beans.factory.config.AbstractFactoryBean;
026import org.springframework.context.ResourceLoaderAware;
027import org.springframework.core.io.Resource;
028import org.springframework.core.io.ResourceLoader;
029import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
030import org.springframework.core.io.support.ResourcePatternResolver;
031import org.springframework.core.io.support.ResourcePatternUtils;
032
033/**
034 * {@link FactoryBean} implementation that takes a list of location Strings
035 * and creates a sorted array of {@link Resource} instances.
036 *
037 * @author Dave Syer
038 * @author Juergen Hoeller
039 * @author Christian Dupuis
040 * @since 3.0
041 */
042public class SortedResourcesFactoryBean extends AbstractFactoryBean<Resource[]> implements ResourceLoaderAware {
043
044        private final List<String> locations;
045
046        private ResourcePatternResolver resourcePatternResolver;
047
048
049        public SortedResourcesFactoryBean(List<String> locations) {
050                this.locations = locations;
051                this.resourcePatternResolver = new PathMatchingResourcePatternResolver();
052        }
053
054        public SortedResourcesFactoryBean(ResourceLoader resourceLoader, List<String> locations) {
055                this.locations = locations;
056                this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
057        }
058
059
060        @Override
061        public void setResourceLoader(ResourceLoader resourceLoader) {
062                this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
063        }
064
065
066        @Override
067        public Class<? extends Resource[]> getObjectType() {
068                return Resource[].class;
069        }
070
071        @Override
072        protected Resource[] createInstance() throws Exception {
073                List<Resource> scripts = new ArrayList<>();
074                for (String location : this.locations) {
075                        List<Resource> resources = new ArrayList<>(
076                                        Arrays.asList(this.resourcePatternResolver.getResources(location)));
077                        resources.sort((r1, r2) -> {
078                                try {
079                                        return r1.getURL().toString().compareTo(r2.getURL().toString());
080                                }
081                                catch (IOException ex) {
082                                        return 0;
083                                }
084                        });
085                        scripts.addAll(resources);
086                }
087                return scripts.toArray(new Resource[0]);
088        }
089
090}