Java File Find findExecutableOnPath(String executableName)

Description

Find an executable based on given name from the PATH.

License

Open Source License

Parameter

Parameter	Description
executableName	the executable name

Return

the executable as a File, or null if not found.

Declaration

public static File findExecutableOnPath(String executableName) 

Method Source Code

//package com.java2s;
/*//from w w  w  .  j  a  v  a 2  s  .  c  o  m
 * Copyright (c) 2007-2008 Nokia Corporation and/or its subsidiary(-ies).
 * All rights reserved.
 * This component and the accompanying materials are made available
 * under the terms of the License "Eclipse Public License v1.0"
 * which accompanies this distribution, and is available
 * at the URL "http://www.eclipse.org/legal/epl-v10.html".
 *
 * Initial Contributors:
 * Nokia Corporation - initial contribution.
 *
 * Contributors:
 *
 * Description:  
 *
 */

import java.io.File;

public class Main {
    /**
     * Find an executable based on given name from the PATH. PATHEXT will be used on windows plaform
     * to search by extension.
     * @param executableName the executable name
     * @return the executable as a File, or null if not found.
     */
    public static File findExecutableOnPath(String executableName) {
        String systemPath = System.getenv("PATH");
        String[] pathDirs = systemPath.split(File.pathSeparator);
        return findExecutableOnPath(executableName, pathDirs);
    }

    /**
     * Find an executable based on given name from the PATH. PATHEXT will be used on windows plaform
     * to search by extension.
     * @param executableName the executable name.
     * @param pathDirs array of directory to look for
     * @return the executable as a File, or null if not found.
     */
    public static File findExecutableOnPath(String executableName, String[] pathDirs) {
        String[] extensions = { "" };

        // Using PATHEXT to get the supported extensions on windows platform
        if (System.getProperty("os.name").toLowerCase().startsWith("win")) {
            extensions = System.getenv("PATHEXT").split(File.pathSeparator);
        }

        for (String extension : extensions) {
            String checkName = executableName;
            if (System.getProperty("os.name").toLowerCase().startsWith("win")
                    && !executableName.toLowerCase().endsWith(extension.toLowerCase())) {
                checkName = executableName + extension;
            }

            File file = new File(checkName);
            if (file.isAbsolute()) {
                if (file.isFile()) {
                    return file;
                }
            }
            for (String pathDir : pathDirs) {
                file = new File(pathDir, checkName);
                if (file.isFile()) {
                    return file;
                }
            }
        }
        return null;
    }
}

Related

1. findExecutableInDirectory(String executable, File directory)
2. findExecutableInPath(String exec)
3. findExecutableInSystemPath(String executable)
4. findExecutableLocation(String executableName)
5. findExecutableOnPath(String executable)
6. findExecutableOnPath(String executableName)
7. findJavaFiles(File dir, Collection filenames)
8. findJavaFiles(File folder)