com.facebook.presto.cli.AbstractWarningsPrinter Maven / Gradle / Ivy
/*
* 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.facebook.presto.spi.PrestoWarning;
import java.util.List;
import java.util.OptionalInt;
import static com.facebook.presto.cli.ConsolePrinter.REAL_TERMINAL;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static java.lang.String.format;
import static java.util.Objects.requireNonNull;
abstract class AbstractWarningsPrinter
implements WarningsPrinter
{
private static final String WARNING_BEGIN = ((char) 27) + "[33m";
private static final String WARNING_END = ((char) 27) + "[39m";
private final OptionalInt maxWarnings;
private boolean hasProcessedWarnings;
private int processedWarnings;
AbstractWarningsPrinter(OptionalInt maxWarnings)
{
this.maxWarnings = requireNonNull(maxWarnings, "maxWarnings is null");
}
private String getWarningMessage(PrestoWarning warning)
{
// If this is a real terminal color the warnings yellow
if (REAL_TERMINAL) {
return format("%sWARNING: %s%s", WARNING_BEGIN, warning.getMessage(), WARNING_END);
}
return format("WARNING: %s", warning.getMessage());
}
private List getNewWarnings(List warnings)
{
int end = warnings.size();
if (maxWarnings.isPresent()) {
end = Math.min(processedWarnings + maxWarnings.getAsInt(), end);
}
List subList = warnings.subList(processedWarnings, end).stream()
.map(this::getWarningMessage)
.collect(toImmutableList());
processedWarnings = end;
return subList;
}
protected abstract void print(List warnings);
protected abstract void printSeparator();
private void printWithSeparators(List warnings)
{
// Print warnings separated from previous and subsequent output
if (!warnings.isEmpty()) {
printSeparator();
print(warnings);
printSeparator();
}
}
private void printWithInitialSeparator(List warnings)
{
// Separate first warnings from previous output
if (!hasProcessedWarnings && !warnings.isEmpty()) {
printSeparator();
hasProcessedWarnings = true;
print(warnings);
}
}
private void printWithTrailingSeparator(List warnings)
{
// Print warnings and separate from subsequent output
if (!warnings.isEmpty()) {
print(warnings);
printSeparator();
}
}
@Override
public void print(List warnings, boolean withInitialSeparator, boolean withTrailingSeparator)
{
requireNonNull(warnings, "warnings is null");
List newWarnings = getNewWarnings(warnings);
if (withInitialSeparator) {
if (withTrailingSeparator) {
printWithSeparators(newWarnings);
}
else {
printWithInitialSeparator(newWarnings);
}
}
else if (withTrailingSeparator) {
printWithTrailingSeparator(newWarnings);
}
else {
print(newWarnings);
}
}
}