| /* |
| * Copyright (C) 2018 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.server.backup.encryption.chunking; |
| |
| import com.android.internal.util.Preconditions; |
| |
| /** Representation of a range of bytes to be downloaded. */ |
| final class ByteRange { |
| private final long mStart; |
| private final long mEnd; |
| |
| /** Creates a range of bytes which includes {@code mStart} and {@code mEnd}. */ |
| ByteRange(long start, long end) { |
| Preconditions.checkArgument(start >= 0); |
| Preconditions.checkArgument(end >= start); |
| mStart = start; |
| mEnd = end; |
| } |
| |
| /** Returns the start of the {@code ByteRange}. The start is included in the range. */ |
| long getStart() { |
| return mStart; |
| } |
| |
| /** Returns the end of the {@code ByteRange}. The end is included in the range. */ |
| long getEnd() { |
| return mEnd; |
| } |
| |
| /** Returns the number of bytes included in the {@code ByteRange}. */ |
| int getLength() { |
| return (int) (mEnd - mStart + 1); |
| } |
| |
| /** Creates a new {@link ByteRange} from {@code mStart} to {@code mEnd + length}. */ |
| ByteRange extend(long length) { |
| Preconditions.checkArgument(length > 0); |
| return new ByteRange(mStart, mEnd + length); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (!(o instanceof ByteRange)) { |
| return false; |
| } |
| |
| ByteRange byteRange = (ByteRange) o; |
| return (mEnd == byteRange.mEnd && mStart == byteRange.mStart); |
| } |
| |
| @Override |
| public int hashCode() { |
| int result = 17; |
| result = 31 * result + (int) (mStart ^ (mStart >>> 32)); |
| result = 31 * result + (int) (mEnd ^ (mEnd >>> 32)); |
| return result; |
| } |
| |
| @Override |
| public String toString() { |
| return String.format("ByteRange{mStart=%d, mEnd=%d}", mStart, mEnd); |
| } |
| } |