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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.common.cli;
import org.apache.commons.cli.CommandLine;
import org.elasticsearch.common.SuppressForbidden;
import java.io.BufferedReader;
import java.io.Console;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Locale;
/**
*
*/
@SuppressForbidden(reason = "System#out")
public abstract class Terminal {
public static final String DEBUG_SYSTEM_PROPERTY = "es.cli.debug";
public static final Terminal DEFAULT = ConsoleTerminal.supported() ? new ConsoleTerminal() : new SystemTerminal();
public static enum Verbosity {
SILENT(0), NORMAL(1), VERBOSE(2);
private final int level;
private Verbosity(int level) {
this.level = level;
}
public boolean enabled(Verbosity verbosity) {
return level >= verbosity.level;
}
public static Verbosity resolve(CommandLine cli) {
if (cli.hasOption("s")) {
return SILENT;
}
if (cli.hasOption("v")) {
return VERBOSE;
}
return NORMAL;
}
}
private Verbosity verbosity = Verbosity.NORMAL;
private final boolean isDebugEnabled;
public Terminal() {
this(Verbosity.NORMAL);
}
public Terminal(Verbosity verbosity) {
this.verbosity = verbosity;
this.isDebugEnabled = "true".equals(System.getProperty(DEBUG_SYSTEM_PROPERTY, "false"));
}
public void verbosity(Verbosity verbosity) {
this.verbosity = verbosity;
}
public Verbosity verbosity() {
return verbosity;
}
public abstract String readText(String text, Object... args);
public abstract char[] readSecret(String text, Object... args);
protected abstract void printStackTrace(Throwable t);
public void println() {
println(Verbosity.NORMAL);
}
public void println(String msg, Object... args) {
println(Verbosity.NORMAL, msg, args);
}
public void print(String msg, Object... args) {
print(Verbosity.NORMAL, msg, args);
}
public void println(Verbosity verbosity) {
println(verbosity, "");
}
public void println(Verbosity verbosity, String msg, Object... args) {
print(verbosity, msg + System.lineSeparator(), args);
}
public void print(Verbosity verbosity, String msg, Object... args) {
if (this.verbosity.enabled(verbosity)) {
doPrint(msg, args);
}
}
public void printError(String msg, Object... args) {
println(Verbosity.SILENT, "ERROR: " + msg, args);
}
public void printError(Throwable t) {
printError("%s", t.toString());
if (isDebugEnabled) {
printStackTrace(t);
}
}
public void printWarn(String msg, Object... args) {
println(Verbosity.SILENT, "WARN: " + msg, args);
}
protected abstract void doPrint(String msg, Object... args);
public abstract PrintWriter writer();
private static class ConsoleTerminal extends Terminal {
final Console console = System.console();
static boolean supported() {
return System.console() != null;
}
@Override
public void doPrint(String msg, Object... args) {
console.printf(msg, args);
console.flush();
}
@Override
public String readText(String text, Object... args) {
return console.readLine(text, args);
}
@Override
public char[] readSecret(String text, Object... args) {
return console.readPassword(text, args);
}
@Override
public PrintWriter writer() {
return console.writer();
}
@Override
public void printStackTrace(Throwable t) {
t.printStackTrace(console.writer());
}
}
@SuppressForbidden(reason = "System#out")
private static class SystemTerminal extends Terminal {
private final PrintWriter printWriter = new PrintWriter(System.out);
@Override
public void doPrint(String msg, Object... args) {
System.out.print(String.format(Locale.ROOT, msg, args));
}
@Override
public String readText(String text, Object... args) {
print(text, args);
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
try {
return reader.readLine();
} catch (IOException ioe) {
throw new RuntimeException(ioe);
}
}
@Override
public char[] readSecret(String text, Object... args) {
return readText(text, args).toCharArray();
}
@Override
public void printStackTrace(Throwable t) {
t.printStackTrace(printWriter);
}
@Override
public PrintWriter writer() {
return printWriter;
}
}
}
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