001package com.pi4j.util;
002
003/*
004 * #%L
005 * **********************************************************************
006 * ORGANIZATION  :  Pi4J
007 * PROJECT       :  Pi4J :: Java Library (Core)
008 * FILENAME      :  ExecUtil.java  
009 * 
010 * This file is part of the Pi4J project. More information about 
011 * this project can be found here:  http://www.pi4j.com/
012 * **********************************************************************
013 * %%
014 * Copyright (C) 2012 - 2015 Pi4J
015 * %%
016 * This program is free software: you can redistribute it and/or modify
017 * it under the terms of the GNU Lesser General Public License as
018 * published by the Free Software Foundation, either version 3 of the
019 * License, or (at your option) any later version.
020 * 
021 * This program is distributed in the hope that it will be useful,
022 * but WITHOUT ANY WARRANTY; without even the implied warranty of
023 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
024 * GNU General Lesser Public License for more details.
025 * 
026 * You should have received a copy of the GNU General Lesser Public
027 * License along with this program.  If not, see
028 * <http://www.gnu.org/licenses/lgpl-3.0.html>.
029 * #L%
030 */
031
032
033import java.io.BufferedReader;
034import java.io.IOException;
035import java.io.InputStreamReader;
036import java.util.ArrayList;
037import java.util.List;
038
039public class ExecUtil
040{
041    public static String[] execute(String command) throws IOException, InterruptedException {
042        return execute(command, null);
043    }
044    
045    public static String[] execute(String command, String split) throws IOException, InterruptedException {
046        List<String> result = new ArrayList<>();
047        Process p = Runtime.getRuntime().exec(command);
048        p.waitFor();
049                
050        if(p.exitValue() != 0)
051            return null;
052        
053        InputStreamReader isr = new InputStreamReader(p.getInputStream());
054        BufferedReader reader = new BufferedReader(isr);
055        String line = reader.readLine();
056        while (line != null) {
057            if (!line.isEmpty()) {
058                if (split == null || split.isEmpty()) {
059                    result.add(line.trim());
060                } else {
061                    String[] parts = line.trim().split(split);
062                    for(String part : parts) {
063                        if (part != null && !part.isEmpty()) {
064                            result.add(part.trim());
065                        }
066                    }
067                }
068            }
069            line = reader.readLine();
070        }
071        
072        // close readers and stream
073        reader.close();
074        isr.close();
075        p.getInputStream().close();
076
077        if (result.size() > 0) {
078            return result.toArray(new String[result.size()]);
079        } else {
080            return new String[0];
081        }
082    }
083}