spring TotalProgressBar 源码
springboot TotalProgressBar 代码
文件路径：/spring-boot-project/spring-boot-tools/spring-boot-buildpack-platform/src/main/java/org/springframework/boot/buildpack/platform/docker/TotalProgressBar.java
/*
* Copyright 2012-2020 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
*
* https://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.springframework.boot.buildpack.platform.docker;
import java.io.PrintStream;
import java.util.function.Consumer;
/**
* Utility to render a simple progress bar based on consumed {@link TotalProgressEvent}
* objects.
*
* @author Phillip Webb
* @since 2.3.0
*/
public class TotalProgressBar implements Consumer<TotalProgressEvent> {
private final char progressChar;
private final boolean bookend;
private final PrintStream out;
private int printed;
/**
* Create a new {@link TotalProgressBar} instance.
* @param prefix the prefix to output
*/
public TotalProgressBar(String prefix) {
this(prefix, System.out);
}
/**
* Create a new {@link TotalProgressBar} instance.
* @param prefix the prefix to output
* @param out the output print stream to use
*/
public TotalProgressBar(String prefix, PrintStream out) {
this(prefix, '#', true, out);
}
/**
* Create a new {@link TotalProgressBar} instance.
* @param prefix the prefix to output
* @param progressChar the progress char to print
* @param bookend if bookends should be printed
* @param out the output print stream to use
*/
public TotalProgressBar(String prefix, char progressChar, boolean bookend, PrintStream out) {
this.progressChar = progressChar;
this.bookend = bookend;
if (prefix != null && !prefix.isEmpty()) {
out.print(prefix);
out.print(" ");
}
if (bookend) {
out.print("[ ");
}
this.out = out;
}
@Override
public void accept(TotalProgressEvent event) {
int percent = event.getPercent() / 2;
while (this.printed < percent) {
this.out.print(this.progressChar);
this.printed++;
}
if (event.getPercent() == 100) {
this.out.println(this.bookend ? " ]" : "");
}
}
}
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