001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *     http://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing, software
013 * distributed under the License is distributed on an "AS IS" BASIS,
014 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
015 * See the License for the specific language governing permissions and
016 * limitations under the License.
017 */
018package org.apache.hadoop.hbase.util;
019
020import java.io.IOException;
021import java.io.OutputStream;
022import java.util.ArrayList;
023import java.util.Collection;
024import org.apache.yetus.audience.InterfaceAudience;
025
026import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
027
028/**
029 * Utility methods for working with {@link ByteRange}.
030 */
031@InterfaceAudience.Public
032public class ByteRangeUtils {
033  public static int numEqualPrefixBytes(ByteRange left, ByteRange right, int rightInnerOffset) {
034    int maxCompares = Math.min(left.getLength(), right.getLength() - rightInnerOffset);
035    final byte[] lbytes = left.getBytes();
036    final byte[] rbytes = right.getBytes();
037    final int loffset = left.getOffset();
038    final int roffset = right.getOffset();
039    for (int i = 0; i < maxCompares; ++i) {
040      if (lbytes[loffset + i] != rbytes[roffset + rightInnerOffset + i]) {
041        return i;
042      }
043    }
044    return maxCompares;
045  }
046
047  public static ArrayList<byte[]> copyToNewArrays(Collection<ByteRange> ranges) {
048    if (ranges == null) {
049      return new ArrayList<>(0);
050    }
051    ArrayList<byte[]> arrays = Lists.newArrayListWithCapacity(ranges.size());
052    for (ByteRange range : ranges) {
053      arrays.add(range.deepCopyToNewArray());
054    }
055    return arrays;
056  }
057
058  public static ArrayList<ByteRange> fromArrays(Collection<byte[]> arrays) {
059    if (arrays == null) {
060      return new ArrayList<>(0);
061    }
062    ArrayList<ByteRange> ranges = Lists.newArrayListWithCapacity(arrays.size());
063    for (byte[] array : arrays) {
064      ranges.add(new SimpleMutableByteRange(array));
065    }
066    return ranges;
067  }
068
069  public static void write(OutputStream os, ByteRange byteRange) throws IOException {
070    os.write(byteRange.getBytes(), byteRange.getOffset(), byteRange.getLength());
071  }
072
073  public static void write(OutputStream os, ByteRange byteRange, int byteRangeInnerOffset)
074    throws IOException {
075    os.write(byteRange.getBytes(), byteRange.getOffset() + byteRangeInnerOffset,
076      byteRange.getLength() - byteRangeInnerOffset);
077  }
078}