ExecutingCommand.java
/**
* Oshi (https://github.com/dblock/oshi)
*
* Copyright (c) 2010 - 2015 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
*
* Contributors:
* dblock[at]dblock[dot]org
* alessandro[at]perucchi[dot]org
* widdis[at]gmail[dot]com
* 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;
/**
* A class for executing on the command line and returning the result of
* execution.
*
* @author alessandro[at]perucchi[dot]org
*/
public class 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
*/
public static ArrayList<String> runNative(String cmdToRun) {
Process p = null;
try {
p = Runtime.getRuntime().exec(cmdToRun);
p.waitFor();
} catch (IOException e) {
return null;
} catch (InterruptedException e) {
return null;
}
BufferedReader reader = new BufferedReader(new InputStreamReader(
p.getInputStream()));
String line = "";
ArrayList<String> sa = new ArrayList<>();
try {
while ((line = reader.readLine()) != null) {
sa.add(line);
}
} catch (IOException e) {
return null;
}
return sa;
}
/**
* Return first line of response for selected command
*
* @param cmd2launch
* String command to be launched
* @return String or null
*/
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 null if invalid index or running
* of command fails
*/
public static String getAnswerAt(String cmd2launch, int answerIdx) {
ArrayList<String> sa = ExecutingCommand.runNative(cmd2launch);
if (sa != null && answerIdx >= 0 && answerIdx < sa.size()) {
return sa.get(answerIdx);
}
return null;
}
}