org.apache.pinot.client.TextTable Maven / Gradle / Ivy
/**
* 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.pinot.client;
import java.util.LinkedList;
import java.util.List;
/**
* Utility class to format tabular data. Useful to display on console for debugging
*/
public class TextTable {
private List rows = new LinkedList<>();
private String[] headerColumnNames;
private final static char PAD_CHAR = ' ';
public TextTable() {
}
public void addHeader(String... headerColumnNames) {
this.headerColumnNames = headerColumnNames;
}
public void addRow(String... columnValues) {
rows.add(columnValues);
}
private int[] colWidths() {
int cols = 0;
if (headerColumnNames != null) {
cols = headerColumnNames.length;
}
for (String[] row : rows) {
cols = Math.max(cols, row.length);
}
int[] widths = new int[cols];
if (headerColumnNames != null) {
updateWidths(widths, headerColumnNames);
}
for (String[] row : rows) {
updateWidths(widths, row);
}
return widths;
}
private void updateWidths(int[] widths, String[] values) {
for (int colNum = 0; colNum < values.length; colNum++) {
int length = 0;
if (values[colNum] != null) {
length = values[colNum].getBytes().length;
}
widths[colNum] = Math.max(widths[colNum], length);
}
}
@Override
public String toString() {
StringBuilder buf = new StringBuilder();
int[] colWidths = colWidths();
if (headerColumnNames != null) {
append(buf, colWidths, headerColumnNames);
int totalWidth = 0;
for (int width : colWidths) {
totalWidth += width;
}
buf.append(rightPad("", totalWidth, '='));
buf.append('\n');
}
for (String[] row : rows) {
append(buf, colWidths, row);
}
return buf.toString();
}
private void append(StringBuilder buf, int[] colWidths, String[] row) {
for (int colNum = 0; colNum < row.length; colNum++) {
buf.append(rightPad(row[colNum], colWidths[colNum], PAD_CHAR));
buf.append(' ');
}
buf.append('\n');
}
public static String rightPad(String str, final int size, final char padChar) {
int length = 0;
if (str != null) {
length = str.length();
}
final int pads = size - length;
if (pads <= 0) {
return str; // returns original String when possible
}
char[] buf = new char[size];
for (int i = 0; i < length; i++) {
buf[i] = str.charAt(i);
}
for (int i = str.length(); i < size; i++) {
buf[i] = padChar;
}
return String.valueOf(buf);
}
}