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.procedure2.util;
019
020import org.apache.yetus.audience.InterfaceAudience;
021import org.apache.yetus.audience.InterfaceStability;
022
023@InterfaceAudience.Private
024@InterfaceStability.Evolving
025public final class StringUtils {
026  private StringUtils() {
027  }
028
029  public static String humanTimeDiff(long timeDiff) {
030    if (timeDiff < 1000) {
031      return String.format("%d msec", timeDiff);
032    }
033
034    StringBuilder buf = new StringBuilder();
035    long hours = timeDiff / (60 * 60 * 1000);
036    long rem = (timeDiff % (60 * 60 * 1000));
037    long minutes = rem / (60 * 1000);
038    rem = rem % (60 * 1000);
039    float seconds = rem / 1000.0f;
040
041    if (hours != 0) {
042      buf.append(hours);
043      buf.append(" hrs, ");
044    }
045    if (minutes != 0) {
046      buf.append(minutes);
047      buf.append(" mins, ");
048    }
049    if (hours > 0 || minutes > 0) {
050      buf.append(seconds);
051      buf.append(" sec");
052    } else {
053      buf.append(String.format("%.4f sec", seconds));
054    }
055    return buf.toString();
056  }
057
058  public static String humanSize(double size) {
059    if (size >= (1L << 40)) {
060      return String.format("%.1f T", size / (1L << 40));
061    }
062
063    if (size >= (1L << 30)) {
064      return String.format("%.1f G", size / (1L << 30));
065    }
066
067    if (size >= (1L << 20)) {
068      return String.format("%.1f M", size / (1L << 20));
069    }
070
071    if (size >= (1L << 10)) {
072      return String.format("%.1f K", size / (1L << 10));
073    }
074
075    return String.format("%.0f", size);
076  }
077
078  public static boolean isEmpty(final String input) {
079    return input == null || input.length() == 0;
080  }
081
082  public static String buildString(final String... parts) {
083    StringBuilder sb = new StringBuilder();
084    for (int i = 0; i < parts.length; ++i) {
085      sb.append(parts[i]);
086    }
087    return sb.toString();
088  }
089
090  public static StringBuilder appendStrings(final StringBuilder sb, final String... parts) {
091    for (int i = 0; i < parts.length; ++i) {
092      sb.append(parts[i]);
093    }
094    return sb;
095  }
096}