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;
024
025import org.apache.yetus.audience.InterfaceAudience;
026
027import org.apache.hbase.thirdparty.com.google.common.collect.Lists;
028
029/**
030 * Utility methods for working with {@link ByteRange}.
031 */
032@InterfaceAudience.Public
033public final class ByteRangeUtils {
034  private ByteRangeUtils() {
035  }
036
037  public static int numEqualPrefixBytes(ByteRange left, ByteRange right, int rightInnerOffset) {
038    int maxCompares = Math.min(left.getLength(), right.getLength() - rightInnerOffset);
039    final byte[] lbytes = left.getBytes();
040    final byte[] rbytes = right.getBytes();
041    final int loffset = left.getOffset();
042    final int roffset = right.getOffset();
043    for (int i = 0; i < maxCompares; ++i) {
044      if (lbytes[loffset + i] != rbytes[roffset + rightInnerOffset + i]) {
045        return i;
046      }
047    }
048    return maxCompares;
049  }
050
051  public static ArrayList<byte[]> copyToNewArrays(Collection<ByteRange> ranges) {
052    if (ranges == null) {
053      return new ArrayList<>(0);
054    }
055    ArrayList<byte[]> arrays = Lists.newArrayListWithCapacity(ranges.size());
056    for (ByteRange range : ranges) {
057      arrays.add(range.deepCopyToNewArray());
058    }
059    return arrays;
060  }
061
062  public static ArrayList<ByteRange> fromArrays(Collection<byte[]> arrays) {
063    if (arrays == null) {
064      return new ArrayList<>(0);
065    }
066    ArrayList<ByteRange> ranges = Lists.newArrayListWithCapacity(arrays.size());
067    for (byte[] array : arrays) {
068      ranges.add(new SimpleMutableByteRange(array));
069    }
070    return ranges;
071  }
072
073  public static void write(OutputStream os, ByteRange byteRange) throws IOException {
074    os.write(byteRange.getBytes(), byteRange.getOffset(), byteRange.getLength());
075  }
076
077  public static void write(OutputStream os, ByteRange byteRange, int byteRangeInnerOffset)
078      throws IOException {
079    os.write(byteRange.getBytes(), byteRange.getOffset() + byteRangeInnerOffset,
080      byteRange.getLength() - byteRangeInnerOffset);
081  }
082}