com.github.born2snipe.cli.ElapsedTimeFormatter Maven / Gradle / Ivy

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This is a simple Java API for printing progress for CLI apps

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/**
 *
 * Copyright to the original author or authors.
 *
 * Licensed 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.
 */
package com.github.born2snipe.cli;

public class ElapsedTimeFormatter {
    public static String formatMillis(long val) {
        StringBuilder buf = new StringBuilder(20);
        String sgn = "";

        if (val < 0) {
            sgn = "-";
            val = Math.abs(val);
        }

        append(buf, sgn, 0, (val / 3600000));
        append(buf, ":", 2, ((val % 3600000) / 60000));
        append(buf, ":", 2, ((val % 60000) / 1000));
        append(buf, ".", 3, (val % 1000));
        return buf.toString();
    }

    private static void append(StringBuilder tgt, String pfx, int dgt, long val) {
        tgt.append(pfx);
        if (dgt > 1) {
            int pad = (dgt - 1);
            for (long xa = val; xa > 9 && pad > 0; xa /= 10) {
                pad--;
            }
            for (int xa = 0; xa < pad; xa++) {
                tgt.append('0');
            }
        }
        tgt.append(val);
    }

}