Strings.java

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// 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
//
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package org.apache.doris.monitor.utils;

/**
 * String utility method for jvm data
 */
public class Strings {

    /**
     * Format the double value with a single decimal points, trimming trailing '.0'.
     */
    public static String format1Decimals(double value, String suffix) {
        String p = String.valueOf(value);
        int ix = p.indexOf('.') + 1;
        int ex = p.indexOf('E');
        char fraction = p.charAt(ix);
        if (fraction == '0') {
            if (ex != -1) {
                return p.substring(0, ix - 1) + p.substring(ex) + suffix;
            } else {
                return p.substring(0, ix - 1) + suffix;
            }
        } else {
            if (ex != -1) {
                return p.substring(0, ix) + fraction + p.substring(ex) + suffix;
            } else {
                return p.substring(0, ix) + fraction + suffix;
            }
        }
    }

    /**
     * Determine whether the given array is empty:
     * i.e. <code>null</code> or of zero length.
     *
     * @param array the array to check
     */
    private static boolean isEmpty(Object[] array) {
        return (array == null || array.length == 0);
    }

    private Strings() {
    }

}