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/**
 *    Copyright 2015-2017 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
 *
 *       http://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.mybatis.spring.boot.autoconfigure;

import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;

import org.apache.ibatis.io.VFS;

import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;

/**
 * @author Hans Westerbeek
 * @author Eddú Meléndez
 * @author Kazuki Shimizu
 */
public class SpringBootVFS extends VFS {

  private final ResourcePatternResolver resourceResolver;

  public SpringBootVFS() {
    this.resourceResolver = new PathMatchingResourcePatternResolver(getClass().getClassLoader());
  }

  @Override
  public boolean isValid() {
    return true;
  }

  @Override
  protected List list(URL url, String path) throws IOException {
    Resource[] resources = resourceResolver.getResources("classpath*:" + path + "/**/*.class");
    List resourcePaths = new ArrayList();
    for (Resource resource : resources) {
      resourcePaths.add(preserveSubpackageName(resource.getURI(), path));
    }
    return resourcePaths;
  }

  private static String preserveSubpackageName(final URI uri, final String rootPath) {
    final String uriStr = uri.toString();
    final int start = uriStr.indexOf(rootPath);
    return uriStr.substring(start);
  }

}