Java tutorial
package me.tongfei.progressbar; /*- * #%L * TongFei ProgressBar * %% * Copyright (C) 2014 - 2018 Tongfei Chen * %% * 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. * #L% */ import jline.Terminal; import jline.TerminalFactory; import org.joda.time.DateTimeZone; import org.joda.time.Duration; import org.joda.time.LocalDateTime; import java.io.PrintStream; /** * @author Tongfei Chen * @since 0.5.0 */ class ProgressThread implements Runnable { volatile boolean killed; ProgressBarStyle style; ProgressState progress; long updateInterval; PrintStream consoleStream; Terminal terminal; int consoleWidth = 80; static int consoleRightMargin = 2; int length; ProgressThread(ProgressState progress, ProgressBarStyle style, long updateInterval, PrintStream consoleStream) { this.progress = progress; this.style = style; this.updateInterval = updateInterval; this.consoleStream = consoleStream; this.killed = false; this.terminal = TerminalFactory.get(); if (terminal.getWidth() >= 10) // Workaround for issue #23 under IntelliJ consoleWidth = terminal.getWidth(); } // between 0 and 1 double progress() { if (progress.max <= 0) return 0.0; else return ((double) progress.current) / progress.max; } // Number of full blocks int progressIntegralPart() { return (int) (progress() * length); } int progressFractionalPart() { double p = progress() * length; double fraction = (p - Math.floor(p)) * style.fractionSymbols.length(); return (int) Math.floor(fraction); } String eta(Duration elapsed) { if (progress.max <= 0 || progress.indefinite) return "?"; else if (progress.current == 0) return "?"; else return Util.formatDuration( elapsed.dividedBy(progress.current).multipliedBy(progress.max - progress.current)); } String percentage() { String res; if (progress.max <= 0 || progress.indefinite) res = "? %"; else res = String.valueOf((int) Math.floor(100.0 * progress.current / progress.max)) + "%"; return Util.repeat(' ', 4 - res.length()) + res; } String ratio() { String m = progress.indefinite ? "?" : String.valueOf(progress.max); String c = String.valueOf(progress.current); return Util.repeat(' ', m.length() - c.length()) + c + "/" + m; } void refresh() { consoleStream.print('\r'); LocalDateTime currTime = LocalDateTime.now(); Duration elapsed = new Duration(progress.startTime.toDateTime(DateTimeZone.UTC), currTime.toDateTime(DateTimeZone.UTC)); String prefix = progress.task + " " + percentage() + " " + style.leftBracket; int maxSuffixLength = Math.max(0, consoleWidth - consoleRightMargin - prefix.length() - 10); String suffix = style.rightBracket + " " + ratio() + " (" + Util.formatDuration(elapsed) + " / " + eta(elapsed) + ") " + progress.extraMessage; if (suffix.length() > maxSuffixLength) suffix = suffix.substring(0, maxSuffixLength); length = consoleWidth - consoleRightMargin - prefix.length() - suffix.length(); StringBuilder sb = new StringBuilder(); sb.append(prefix); // case of indefinite progress bars if (progress.indefinite) { int pos = (int) (progress.current % length); sb.append(Util.repeat(style.space, pos)); sb.append(style.block); sb.append(Util.repeat(style.space, length - pos - 1)); } // case of definite progress bars else { sb.append(Util.repeat(style.block, progressIntegralPart())); if (progress.current < progress.max) { sb.append(style.fractionSymbols.charAt(progressFractionalPart())); sb.append(Util.repeat(style.space, length - progressIntegralPart() - 1)); } } sb.append(suffix); String line = sb.toString(); consoleStream.print(line); } void kill() { killed = true; } public void run() { try { while (!killed) { refresh(); Thread.sleep(updateInterval); } refresh(); // do-while loop not right: must force to refresh after stopped } catch (InterruptedException ex) { } } }