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Where all the magic happens
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/*
 * Copyright 2013 eXo Platform SAS
 *
 * 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 juzu.impl.compiler.file;

import juzu.impl.common.FileKey;
import juzu.impl.fs.spi.ReadFileSystem;

import javax.tools.JavaFileObject;
import javax.tools.StandardLocation;
import java.io.File;
import java.io.IOException;
import java.util.Collection;
import java.util.Set;

/** @author Julien Viet */
public class CompositeFileManager extends FileManager {

  /** . */
  private FileManager[] components;

  public CompositeFileManager(StandardLocation location, Collection> fsList) {
    FileManager[] components = new FileManager[fsList.size()];
    int index = 0;
    for (ReadFileSystem fs : fsList) {
      components[index++] = SimpleFileManager.wrap(location, fs);
    }

    //
    this.components = components;
  }

  @Override
  public void populateRoots(Set roots) throws IOException {
    for (FileManager component : components) {
      component.populateRoots(roots);
    }
  }

  @Override
  public JavaFileObject getReadable(FileKey key) throws IOException {
    for (FileManager component : components) {
      JavaFileObject readable = component.getReadable(key);
      if (readable != null) {
        return readable;
      }
    }
    return null;
  }

  @Override
  public JavaFileObject getWritable(FileKey key) throws IOException {
    for (FileManager component : components) {
      JavaFileObject writable = component.getWritable(key);
      if (writable != null) {
        return writable;
      }
    }
    return null;
  }

  @Override
  public > C list(String packageName, Set kinds, boolean recurse, C to) throws IOException {
    for (FileManager component : components) {
      component.list(packageName, kinds, recurse, to);
    }
    return to;
  }

  @Override
  public void clearCache() {
    for (FileManager component : components) {
      component.clearCache();
    }
  }
}