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feat(cli): improve CLI transient queries with headers and spacing (pa…
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155 changes: 155 additions & 0 deletions
155
ksql-cli/src/main/java/io/confluent/ksql/util/TabularRow.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,155 @@ | ||
| /* | ||
| * Copyright 2019 Confluent Inc. | ||
| * | ||
| * Licensed under the Confluent Community License (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.confluent.io/confluent-community-license | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT | ||
| * WARRANTIES OF ANY KIND, either express or implied. See the License for the | ||
| * specific language governing permissions and limitations under the License. | ||
| */ | ||
|
|
||
| package io.confluent.ksql.util; | ||
|
|
||
| import com.google.common.annotations.VisibleForTesting; | ||
| import com.google.common.base.Splitter; | ||
| import com.google.common.base.Strings; | ||
| import io.confluent.ksql.GenericRow; | ||
| import io.confluent.ksql.rest.entity.FieldInfo; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
|
|
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| public class TabularRow { | ||
|
|
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| private static final int MIN_CELL_WIDTH = 5; | ||
|
|
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| private final int width; | ||
| private final List<String> value; | ||
| private final List<String> header; | ||
| private final boolean isHeader; | ||
|
|
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| public static TabularRow createHeader(final int width, final List<FieldInfo> header) { | ||
| return new TabularRow( | ||
| width, | ||
| header.stream().map(FieldInfo::getName).collect(Collectors.toList()), | ||
| null); | ||
| } | ||
|
|
||
| public static TabularRow createRow( | ||
| final int width, | ||
| final List<FieldInfo> header, | ||
| final GenericRow value | ||
| ) { | ||
| return new TabularRow( | ||
| width, | ||
| header.stream().map(FieldInfo::getName).collect(Collectors.toList()), | ||
| value.getColumns().stream().map(Objects::toString).collect(Collectors.toList()) | ||
| ); | ||
| } | ||
|
|
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| @VisibleForTesting | ||
| TabularRow( | ||
| final int width, | ||
| final List<String> header, | ||
| final List<String> value | ||
| ) { | ||
| this.header = Objects.requireNonNull(header, "header"); | ||
| this.width = width; | ||
| this.value = value; | ||
| this.isHeader = value == null; | ||
| } | ||
|
|
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| @Override | ||
| public String toString() { | ||
| final List<String> columns = isHeader ? header : value; | ||
|
|
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| if (columns.isEmpty()) { | ||
| return ""; | ||
| } | ||
|
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| final int cellWidth = Math.max(width / columns.size() - 2, MIN_CELL_WIDTH); | ||
| final StringBuilder builder = new StringBuilder(); | ||
|
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| if (isHeader) { | ||
| separatingLine(builder, cellWidth, columns.size()); | ||
| builder.append('\n'); | ||
| } | ||
|
|
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| // split each column into fix length chunks | ||
| final List<List<String>> split = columns.stream() | ||
| .map(col -> splitToFixed(col, cellWidth)) | ||
| .collect(Collectors.toList()); | ||
|
|
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| // buffer each column vertically to have the max number of splits | ||
| final int maxSplit = split.stream().mapToInt(List::size).max().orElse(0); | ||
| final List<List<String>> buffered = split.stream() | ||
| .map(s -> addUntil(s, createCell("", cellWidth), maxSplit)) | ||
| .collect(Collectors.toList()); | ||
|
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| formatRow(builder, buffered, maxSplit); | ||
|
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| if (isHeader) { | ||
| builder.append('\n'); | ||
| separatingLine(builder, cellWidth, columns.size()); | ||
| } | ||
|
|
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| return builder.toString(); | ||
| } | ||
|
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| @SuppressWarnings("ForLoopReplaceableByForEach") // clearer to read this way | ||
| private static void formatRow( | ||
| final StringBuilder builder, | ||
| final List<List<String>> columns, | ||
| final int numRows | ||
| ) { | ||
| for (int row = 0; row < numRows; row++) { | ||
| builder.append('|'); | ||
| for (int col = 0; col < columns.size(); col++) { | ||
| builder.append(columns.get(col).get(row)); | ||
| } | ||
| if (row != numRows - 1) { | ||
| builder.append('\n'); | ||
| } | ||
| } | ||
| } | ||
|
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| @SuppressWarnings("UnstableApiUsage") | ||
| private static List<String> splitToFixed(final String value, final int width) { | ||
| return Splitter.fixedLength(width) | ||
| .splitToList(value) | ||
| .stream() | ||
| .map(line -> createCell(line, width)) | ||
| .collect(Collectors.toList()); | ||
| } | ||
|
|
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| private static void separatingLine( | ||
| final StringBuilder builder, | ||
| final int cellWidth, | ||
| final int numColumns | ||
| ) { | ||
| builder.append("+"); | ||
| for (int i = 0; i < numColumns; i++) { | ||
| builder.append(Strings.repeat("-", cellWidth)); | ||
| builder.append("+"); | ||
| } | ||
| } | ||
|
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| private static String createCell(final String value, final int width) { | ||
| final String format = "%-" + width + "s|"; | ||
| return String.format(format, value); | ||
| } | ||
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| private static <T> List<T> addUntil(final List<T> source, final T value, final int desiredSize) { | ||
| final List<T> copy = new ArrayList<>(source) ; | ||
| while (copy.size() < desiredSize) { | ||
| copy.add(value); | ||
| } | ||
| return copy; | ||
| } | ||
| } |
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