kafka StringFormatter 源码
kafka StringFormatter 代码
文件路径:/trogdor/src/main/java/org/apache/kafka/trogdor/common/StringFormatter.java
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file 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
*
* 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.apache.kafka.trogdor.common;
import java.time.Duration;
import java.time.ZoneOffset;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
/**
* Utilities for formatting strings.
*/
public class StringFormatter {
/**
* Pretty-print a date string.
*
* @param timeMs The time since the epoch in milliseconds.
* @param zoneOffset The time zone offset.
* @return The date string in ISO format.
*/
public static String dateString(long timeMs, ZoneOffset zoneOffset) {
return new Date(timeMs).toInstant().
atOffset(zoneOffset).
format(DateTimeFormatter.ISO_OFFSET_DATE_TIME);
}
/**
* Pretty-print a duration.
*
* @param periodMs The duration in milliseconds.
* @return A human-readable duration string.
*/
public static String durationString(long periodMs) {
StringBuilder bld = new StringBuilder();
Duration duration = Duration.ofMillis(periodMs);
long hours = duration.toHours();
if (hours > 0) {
bld.append(hours).append("h");
duration = duration.minusHours(hours);
}
long minutes = duration.toMinutes();
if (minutes > 0) {
bld.append(minutes).append("m");
duration = duration.minusMinutes(minutes);
}
long seconds = duration.getSeconds();
if ((seconds != 0) || bld.toString().isEmpty()) {
bld.append(seconds).append("s");
}
return bld.toString();
}
/**
* Formats strings in a grid pattern.
*
* All entries in the same column will have the same width.
*
* @param lines A list of lines. Each line contains a list of columns.
* Each line must contain the same number of columns.
* @return The string.
*/
public static String prettyPrintGrid(List<List<String>> lines) {
int numColumns = -1;
int rowIndex = 0;
for (List<String> col : lines) {
if (numColumns == -1) {
numColumns = col.size();
} else if (numColumns != col.size()) {
throw new RuntimeException("Expected " + numColumns + " columns in row " +
rowIndex + ", but got " + col.size());
}
rowIndex++;
}
List<Integer> widths = new ArrayList<>(numColumns);
for (int x = 0; x < numColumns; x++) {
int w = 0;
for (List<String> cols : lines) {
w = Math.max(w, cols.get(x).length() + 1);
}
widths.add(w);
}
StringBuilder bld = new StringBuilder();
for (int y = 0; y < lines.size(); y++) {
List<String> cols = lines.get(y);
for (int x = 0; x < cols.size(); x++) {
String val = cols.get(x);
int minWidth = widths.get(x);
bld.append(val);
for (int i = 0; i < minWidth - val.length(); i++) {
bld.append(" ");
}
}
bld.append(String.format("%n"));
}
return bld.toString();
}
}
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