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CommonJS modules implementation for Nashorn

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package com.coveo.nashorn_modules;

import org.apache.commons.io.IOUtils;

import java.io.IOException;
import java.io.InputStream;

public class ResourceFolder extends AbstractFolder {
  private ClassLoader loader;
  private String resourcePath;
  private String encoding;

  @Override
  public String getFile(String name) {
    InputStream stream = loader.getResourceAsStream(resourcePath + "/" + name);
    if (stream == null) {
      return null;
    }

    try {
      return IOUtils.toString(stream, encoding);
    } catch (IOException ex) {
      return null;
    }
  }

  @Override
  public Folder getFolder(String name) {
    return new ResourceFolder(
        loader, resourcePath + "/" + name, this, getPath() + name + "/", encoding);
  }

  private ResourceFolder(
      ClassLoader loader, String resourcePath, Folder parent, String displayPath, String encoding) {
    super(parent, displayPath);
    this.loader = loader;
    this.resourcePath = resourcePath;
    this.encoding = encoding;
  }

  public static ResourceFolder create(ClassLoader loader, String path, String encoding) {
    return new ResourceFolder(loader, path, null, "/", encoding);
  }
}