org.springframework.jdbc.config.SortedResourcesFactoryBean.java Source code

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Here is the source code for org.springframework.jdbc.config.SortedResourcesFactoryBean.java

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/*
 * Copyright 2002-2018 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.jdbc.config;

import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.beans.factory.FactoryBean;
import org.springframework.beans.factory.config.AbstractFactoryBean;
import org.springframework.context.ResourceLoaderAware;
import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceLoader;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternUtils;

/**
 * {@link FactoryBean} implementation that takes a list of location Strings
 * and creates a sorted array of {@link Resource} instances.
 *
 * @author Dave Syer
 * @author Juergen Hoeller
 * @author Christian Dupuis
 * @since 3.0
 */
public class SortedResourcesFactoryBean extends AbstractFactoryBean<Resource[]> implements ResourceLoaderAware {

    private final List<String> locations;

    private ResourcePatternResolver resourcePatternResolver;

    public SortedResourcesFactoryBean(List<String> locations) {
        this.locations = locations;
        this.resourcePatternResolver = new PathMatchingResourcePatternResolver();
    }

    public SortedResourcesFactoryBean(ResourceLoader resourceLoader, List<String> locations) {
        this.locations = locations;
        this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
    }

    @Override
    public void setResourceLoader(ResourceLoader resourceLoader) {
        this.resourcePatternResolver = ResourcePatternUtils.getResourcePatternResolver(resourceLoader);
    }

    @Override
    public Class<? extends Resource[]> getObjectType() {
        return Resource[].class;
    }

    @Override
    protected Resource[] createInstance() throws Exception {
        List<Resource> scripts = new ArrayList<>();
        for (String location : this.locations) {
            List<Resource> resources = new ArrayList<>(
                    Arrays.asList(this.resourcePatternResolver.getResources(location)));
            resources.sort((r1, r2) -> {
                try {
                    return r1.getURL().toString().compareTo(r2.getURL().toString());
                } catch (IOException ex) {
                    return 0;
                }
            });
            scripts.addAll(resources);
        }
        return scripts.toArray(new Resource[0]);
    }

}