| /* |
| * Copyright (C) 2016 The Android Open Source Project |
| * |
| * 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.android.apksig.util; |
| |
| import com.android.apksig.internal.util.ByteBufferDataSource; |
| import com.android.apksig.internal.util.FileChannelDataSource; |
| import java.io.RandomAccessFile; |
| import java.nio.ByteBuffer; |
| import java.nio.channels.FileChannel; |
| |
| /** |
| * Utility methods for working with {@link DataSource} abstraction. |
| */ |
| public abstract class DataSources { |
| private DataSources() {} |
| |
| /** |
| * Returns a {@link DataSource} backed by the provided {@link ByteBuffer}. The data source |
| * represents the data contained between the position and limit of the buffer. Changes to the |
| * buffer's contents will be visible in the data source. |
| */ |
| public static DataSource asDataSource(ByteBuffer buffer) { |
| if (buffer == null) { |
| throw new NullPointerException(); |
| } |
| return new ByteBufferDataSource(buffer); |
| } |
| |
| /** |
| * Returns a {@link DataSource} backed by the provided {@link RandomAccessFile}. Changes to the |
| * file, including changes to size of file, will be visible in the data source. |
| */ |
| public static DataSource asDataSource(RandomAccessFile file) { |
| return asDataSource(file.getChannel()); |
| } |
| |
| /** |
| * Returns a {@link DataSource} backed by the provided region of the {@link RandomAccessFile}. |
| * Changes to the file will be visible in the data source. |
| */ |
| public static DataSource asDataSource(RandomAccessFile file, long offset, long size) { |
| return asDataSource(file.getChannel(), offset, size); |
| } |
| |
| /** |
| * Returns a {@link DataSource} backed by the provided {@link FileChannel}. Changes to the |
| * file, including changes to size of file, will be visible in the data source. |
| */ |
| public static DataSource asDataSource(FileChannel channel) { |
| if (channel == null) { |
| throw new NullPointerException(); |
| } |
| return new FileChannelDataSource(channel); |
| } |
| |
| /** |
| * Returns a {@link DataSource} backed by the provided region of the {@link FileChannel}. |
| * Changes to the file will be visible in the data source. |
| */ |
| public static DataSource asDataSource(FileChannel channel, long offset, long size) { |
| if (channel == null) { |
| throw new NullPointerException(); |
| } |
| return new FileChannelDataSource(channel, offset, size); |
| } |
| } |