/*
* 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.
*/
package com.facebook.presto.cli;
import com.google.common.base.Splitter;
import com.google.common.collect.ImmutableList;
import org.fusesource.jansi.AnsiString;
import java.io.IOException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkState;
import static com.google.common.base.Strings.repeat;
import static java.lang.Math.max;
import static java.lang.String.format;
public class AlignedTablePrinter
implements OutputPrinter
{
private static final Splitter LINE_SPLITTER = Splitter.on('\n');
private final List<String> fieldNames;
private final Writer writer;
private boolean headerOutput;
private long rowCount;
public AlignedTablePrinter(List<String> fieldNames, Writer writer)
{
this.fieldNames = ImmutableList.copyOf(checkNotNull(fieldNames, "fieldNames is null"));
this.writer = checkNotNull(writer, "writer is null");
}
@Override
public void finish()
throws IOException
{
printRows(ImmutableList.<List<?>>of(), true);
writer.append(format("(%s row%s)%n", rowCount, (rowCount != 1) ? "s" : ""));
writer.flush();
}
@Override
public void printRows(List<List<?>> rows, boolean complete)
throws IOException
{
rowCount += rows.size();
int columns = fieldNames.size();
int[] maxWidth = new int[columns];
for (int i = 0; i < columns; i++) {
maxWidth[i] = max(1, fieldNames.get(i).length());
}
for (List<?> row : rows) {
for (int i = 0; i < row.size(); i++) {
String s = formatValue(row.get(i));
maxWidth[i] = max(maxWidth[i], maxLineLength(s));
}
}
if (!headerOutput) {
headerOutput = true;
for (int i = 0; i < columns; i++) {
if (i > 0) {
writer.append('|');
}
String name = fieldNames.get(i);
writer.append(center(name, maxWidth[i], 1));
}
writer.append('\n');
for (int i = 0; i < columns; i++) {
if (i > 0) {
writer.append('+');
}
writer.append(repeat("-", maxWidth[i] + 2));
}
writer.append('\n');
}
for (List<?> row : rows) {
List<List<String>> columnLines = new ArrayList<>(columns);
int maxLines = 1;
for (int i = 0; i < columns; i++) {
String s = formatValue(row.get(i));
ImmutableList<String> lines = ImmutableList.copyOf(LINE_SPLITTER.split(s));
columnLines.add(lines);
maxLines = max(maxLines, lines.size());
}
for (int line = 0; line < maxLines; line++) {
for (int column = 0; column < columns; column++) {
if (column > 0) {
writer.append('|');
}
List<String> lines = columnLines.get(column);
String s = (line < lines.size()) ? lines.get(line) : "";
boolean numeric = row.get(column) instanceof Number;
String out = align(s, maxWidth[column], 1, numeric);
if ((!complete || (rowCount > 1)) && ((line + 1) < lines.size())) {
out = out.substring(0, out.length() - 1) + "+";
}
writer.append(out);
}
writer.append('\n');
}
}
writer.flush();
}
static String formatValue(Object o)
{
return (o == null) ? "NULL" : o.toString();
}
private static String center(String s, int maxWidth, int padding)
{
AnsiString ansiString = new AnsiString(s);
checkState(ansiString.length() <= maxWidth, "string length is greater than max width");
int left = (maxWidth - ansiString.length()) / 2;
int right = maxWidth - (left + ansiString.length());
return repeat(" ", left + padding) + s + repeat(" ", right + padding);
}
private static String align(String s, int maxWidth, int padding, boolean right)
{
AnsiString ansiString = new AnsiString(s);
checkState(ansiString.length() <= maxWidth, "string length is greater than max width");
String large = repeat(" ", (maxWidth - ansiString.length()) + padding);
String small = repeat(" ", padding);
return right ? (large + s + small) : (small + s + large);
}
static int maxLineLength(String s)
{
int n = 0;
for (String line : LINE_SPLITTER.split(s)) {
n = max(n, new AnsiString(line).length());
}
return n;
}
}