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The runtime library of DBFlute

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/*
 * Copyright 2014-2019 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 org.dbflute.util;

/**
 * @author jflute
 */
public class DfTraceViewUtil {

    /**
     * Convert to performance view.
     * @param after_minus_before The difference between before time and after time.
     * @return The view string to show performance. e.g. 01m40s012ms (NotNull)
     */
    public static String convertToPerformanceView(long after_minus_before) {
        if (after_minus_before < 0) {
            // no exception because this method is basically for logging
            return String.valueOf(after_minus_before);
        }

        // this code was written when jflute was very young
        // (it remains without refactoring)
        long sec = after_minus_before / 1000;
        final long min = sec / 60;
        sec = sec % 60;
        final long mil = after_minus_before % 1000;

        final StringBuilder sb = new StringBuilder();
        if (min >= 10) { // Minute
            sb.append(min).append("m");
        } else if (min < 10 && min >= 0) {
            sb.append("0").append(min).append("m");
        }
        if (sec >= 10) { // Second
            sb.append(sec).append("s");
        } else if (sec < 10 && sec >= 0) {
            sb.append("0").append(sec).append("s");
        }
        if (mil >= 100) { // Millisecond
            sb.append(mil).append("ms");
        } else if (mil < 100 && mil >= 10) {
            sb.append("0").append(mil).append("ms");
        } else if (mil < 10 && mil >= 0) {
            sb.append("00").append(mil).append("ms");
        }

        return sb.toString();
    }
}