// Copyright (c) 2009 The Chromium Authors. All rights reserved.

// Use of this source code is governed by a BSD-style license that can be

// found in the LICENSE file.

package org.chromium.debug.core.efs;

import java.net.URI;

import java.net.URISyntaxException;

import org.chromium.debug.core.ChromiumDebugPlugin;

import org.eclipse.core.filesystem.IFileStore;

import org.eclipse.core.filesystem.provider.FileSystem;

import org.eclipse.core.runtime.IPath;

import org.eclipse.core.runtime.Path;

/**

 * An in-memory filesystem for remote scripts.

 * The supported URLs are {@code chromiumdebug:///resource_path}.

 */

public class ChromiumScriptFileSystem extends FileSystem {

  /** All file URLs in this filesystem have this scheme. */

  private static final String CHROMIUMDEBUG_SCHEME = "chromiumdebug"; //$NON-NLS-1$

  @Override

  public IFileStore getStore(URI uri) {

    return new ChromiumScriptFileStore(this, toPath(uri));

  }

  /**

   * Constructs a URI by a path.

   *

   * @param path of a filesystem resource

   * @return a URI corresponding to the given {@code path}

   */

  public static URI getFileStoreUri(IPath path) {

    try {

      return new URI(CHROMIUMDEBUG_SCHEME, null, path.toPortableString(), null);

    } catch (URISyntaxException e) {

      ChromiumDebugPlugin.log(e);

      return null;

    }

  }

  /**

   * Converts a chromiumdebug FS FileStore URI into a path relative to the FS root.

   *

   * @param uri to convert

   * @return the path corresponding to the uri

   */

  static IPath toPath(URI uri) {

    return Path.fromPortableString(uri.getPath()).setDevice(null);

  }

  /**

   * Converts a chromiumdebug FS FileStore path into a FS URI.

   *

   * @param path to convert

   * @return the URI corresponding to the given path

   */

  static URI toUri(IPath path) {

    try {

      return new URI(CHROMIUMDEBUG_SCHEME, null, path.toPortableString(), null);

    } catch (URISyntaxException e) {

      return null;

    }

  }

}