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// Copyright 2015 The Bazel Authors. All rights reserved.
//
// 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 com.google.devtools.build.android.ziputils;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.channels.FileChannel;
/**
* A simple file system abstraction, for testing. This library doesn't itself open files.
* Clients are responsible for opening files and pass in file channels to the API.
* This class is currently here to be able to use an common abstraction for testing the
* library, and tools implemented using this library. This class may be removed in the future.
*/
class FileSystem {
protected static FileSystem fileSystem;
/**
* Returns the configured file system implementation. If no filesystem is configured, and
* instance of this class is created and returned. The default filesystem implementation is
* a simple wrapper of the standard Java file system.
*/
public static FileSystem fileSystem() {
if (fileSystem == null) {
fileSystem = new FileSystem();
}
return fileSystem;
}
/**
* Opens a file for reading, and returns a file channel.
*
* @param filename name of file to open.
* @return file channel open for reading.
* @throws java.io.IOException
*/
public FileChannel getInputChannel(String filename) throws IOException {
return new FileInputStream(filename).getChannel();
}
/**
* Opens a file for writing, and returns a file channel.
*
* @param filename name of file to open.
* @param append whether to open file in append mode.
* @return file channel open for write.
* @throws java.io.IOException
*/
public FileChannel getOutputChannel(String filename, boolean append) throws IOException {
return new FileOutputStream(filename, append).getChannel();
}
/**
* Opens a file for reading, and returns an input stream.
*
* @param filename name of file to open.
* @return input stream reading from the specified file.
* @throws java.io.IOException
*/
public InputStream getInputStream(String filename) throws IOException {
return new FileInputStream(filename);
}
}
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