com.arangodb.shaded.vertx.core.impl.launcher.commands.VersionCommand Maven / Gradle / Ivy
/*
* Copyright (c) 2011-2019 Contributors to the Eclipse Foundation
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
* which is available at https://www.apache.org/licenses/LICENSE-2.0.
*
* SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
*/
package com.arangodb.shaded.vertx.core.impl.launcher.commands;
import com.arangodb.shaded.vertx.core.cli.CLIException;
import com.arangodb.shaded.vertx.core.cli.annotations.Description;
import com.arangodb.shaded.vertx.core.cli.annotations.Name;
import com.arangodb.shaded.vertx.core.cli.annotations.Summary;
import com.arangodb.shaded.vertx.core.impl.logging.Logger;
import com.arangodb.shaded.vertx.core.impl.logging.LoggerFactory;
import com.arangodb.shaded.vertx.core.spi.launcher.DefaultCommand;
import java.io.IOException;
import java.io.InputStream;
import java.util.Scanner;
/**
* Comment to display the vert.x (core) version.
*
* @author Clement Escoffier
*/
@Name("version")
@Summary("Displays the version.")
@Description("Prints the vert.x core version used by the application.")
public class VersionCommand extends DefaultCommand {
private static final Logger log = LoggerFactory.getLogger(VersionCommand.class);
private static String version;
@Override
public void run() throws CLIException {
log.info(getVersion());
}
/**
* Reads the version from the {@code vertx-version.txt} file.
*
* @return the version
*/
public static String getVersion() {
if (version != null) {
return version;
}
try (InputStream is = VersionCommand.class.getClassLoader().getResourceAsStream("META-INF/vertx/vertx-version.txt")) {
if (is == null) {
throw new IllegalStateException("Cannot find vertx-version.txt on classpath");
}
try (Scanner scanner = new Scanner(is, "UTF-8").useDelimiter("\\A")) {
return version = scanner.hasNext() ? scanner.next().trim() : "";
}
} catch (IOException e) {
throw new IllegalStateException(e.getMessage());
}
}
}