StringUtils.java Source code

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Here is the source code for StringUtils.java

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/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.InetAddress;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.text.DateFormat;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.List;
import java.util.StringTokenizer;
import java.util.Collection;

/**
 * General string utils
 */
public class StringUtils {

    final public static char COMMA = ',';
    final public static String COMMA_STR = ",";
    final public static char ESCAPE_CHAR = '\\';
    private static DecimalFormat oneDecimal = new DecimalFormat("0.0");

    /**
     * Given an integer, return a string that is in an approximate, but human 
     * readable format. 
     * It uses the bases 'k', 'm', and 'g' for 1024, 1024**2, and 1024**3.
     * @param number the number to format
     * @return a human readable form of the integer
     */
    public static String humanReadableInt(long number) {
        long absNumber = Math.abs(number);
        double result = number;
        String suffix = "";
        if (absNumber < 1024) {
            // nothing
        } else if (absNumber < 1024 * 1024) {
            result = number / 1024.0;
            suffix = "k";
        } else if (absNumber < 1024 * 1024 * 1024) {
            result = number / (1024.0 * 1024);
            suffix = "m";
        } else {
            result = number / (1024.0 * 1024 * 1024);
            suffix = "g";
        }
        return oneDecimal.format(result) + suffix;
    }
}