| // Copyright 2017 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.desugar.io; |
| |
| import com.google.common.collect.ImmutableList; |
| import com.google.errorprone.annotations.MustBeClosed; |
| import java.io.Closeable; |
| import java.io.IOError; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Path; |
| import java.util.zip.ZipEntry; |
| |
| /** Input file provider allows to iterate on relative path filename of a directory or a jar file. */ |
| public interface InputFileProvider extends Closeable, Iterable<String> { |
| |
| /** |
| * Return a ZipEntry for {@code filename}. If the provider is a {@link ZipInputFileProvider}, the |
| * method returns the existing ZipEntry in order to keep its metadata, otherwise a new one is |
| * created. |
| */ |
| ZipEntry getZipEntry(String filename); |
| |
| /** |
| * This method returns an input stream allowing to read the file {@code filename}, it is the |
| * responsibility of the caller to close this stream. |
| */ |
| InputStream getInputStream(String filename) throws IOException; |
| |
| /** Transform a Path to an InputFileProvider that needs to be closed by the caller. */ |
| @MustBeClosed |
| public static InputFileProvider open(Path path) throws IOException { |
| if (Files.isDirectory(path)) { |
| return new DirectoryInputFileProvider(path); |
| } else { |
| return new ZipInputFileProvider(path); |
| } |
| } |
| |
| default ImmutableList<FileContentProvider<? extends InputStream>> toInputFileStreams() { |
| ImmutableList.Builder<FileContentProvider<? extends InputStream>> inputClassFileContents = |
| ImmutableList.builder(); |
| for (String inputFileName : this) { |
| inputClassFileContents.add( |
| new FileContentProvider<>( |
| inputFileName, |
| () -> { |
| try { |
| return getInputStream(inputFileName); |
| } catch (IOException e) { |
| throw new IOError(e); |
| } |
| })); |
| } |
| return inputClassFileContents.build(); |
| } |
| } |