oshi.util.ExecutingCommand Maven / Gradle / Ivy
/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2016 The Oshi Project Team
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Maintainers:
* dblock[at]dblock[dot]org
* widdis[at]gmail[dot]com
* enrico.bianchi[at]gmail[dot]com
*
* Contributors:
* https://github.com/dblock/oshi/graphs/contributors
*/
package oshi.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* A class for executing on the command line and returning the result of
* execution.
*
* @author alessandro[at]perucchi[dot]org
*/
public class ExecutingCommand {
private static final Logger LOG = LoggerFactory.getLogger(ExecutingCommand.class);
private ExecutingCommand() {
}
/**
* Executes a command on the native command line and returns the result.
*
* @param cmdToRun
* Command to run
* @return A list of Strings representing the result of the command, or
* empty string if the command failed
*/
public static List runNative(String cmdToRun) {
String[] cmd = cmdToRun.split(" ");
return runNative(cmd);
}
/**
* Executes a command on the native command line and returns the result.
*
* @param cmdToRunWithArgs
* Command to run and args, in an array
* @return A list of Strings representing the result of the command, or
* empty string if the command failed
*/
public static List runNative(String[] cmdToRunWithArgs) {
Process p = null;
try {
p = Runtime.getRuntime().exec(cmdToRunWithArgs);
} catch (SecurityException | IOException e) {
LOG.trace("", e);
return new ArrayList<>(0);
}
ArrayList sa = new ArrayList<>();
try (BufferedReader reader = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
String line;
while ((line = reader.readLine()) != null) {
sa.add(line);
}
p.waitFor();
} catch (InterruptedException | IOException e) {
LOG.trace("", e);
return new ArrayList<>(0);
}
return sa;
}
/**
* Return first line of response for selected command.
*
* @param cmd2launch
* String command to be launched
* @return String or empty string if command failed
*/
public static String getFirstAnswer(String cmd2launch) {
return getAnswerAt(cmd2launch, 0);
}
/**
* Return response on selected line index (0-based) after running selected
* command.
*
* @param cmd2launch
* String command to be launched
* @param answerIdx
* int index of line in response of the command
* @return String whole line in response or empty string if invalid index or
* running of command fails
*/
public static String getAnswerAt(String cmd2launch, int answerIdx) {
List sa = ExecutingCommand.runNative(cmd2launch);
if (answerIdx >= 0 && answerIdx < sa.size()) {
return sa.get(answerIdx);
}
return "";
}
}