112 lines
2.7 KiB
Java
112 lines
2.7 KiB
Java
/*
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* @(#)Classpath.java
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*
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* Copyright (C) 2001 by Erik C. Thauvin (erik@thauvin.net)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* A copy of the GNU General Public License can be obtained by
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* visting the Free Software Foundation Web site at:
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*
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* <http://www.gnu.org/copyleft/gpl.html>
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*
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* or by writting to:
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*
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* Free Software Foundation, Inc.
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* 59 Temple Place - Suite 330
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* Boston, MA 02111-1307, USA.
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*
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* $Id$
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*/
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import java.io.*;
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import java.util.StringTokenizer;
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/**
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* The Classpath class demonstrates how to check for the presence of a given
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* library in the system class path.
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*
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* @author Erik C. Thauvin
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* @created September 7, 2001
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*/
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public class Classpath extends java.lang.Object
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{
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/**
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* Returns true if the given library is included the system class path, and
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* actually exists on disk. Returns false otherwise.
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*
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* @param libName The name of the library
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* @return true or false.
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*/
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public static boolean isLibInClassPath(String libName)
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{
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// Get the class path
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String classPath =
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System.getProperty("java.class.path", ".").toLowerCase();
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// Get the library name (e.g.: "\tools.jar")
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String lib = (File.separator + libName.toLowerCase());
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// Tokenize the class path using the path separator
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StringTokenizer st =
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new StringTokenizer(classPath, File.pathSeparator);
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String libPath;
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File filePath;
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// Loop thru the class path entries
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while (st.hasMoreTokens())
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{
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// Get the current class path entry
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libPath = st.nextToken();
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// Does it contain our library?
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if (libPath.endsWith(lib))
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{
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filePath = new File(libPath);
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// Does the file actually exists?
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if (filePath.exists())
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{
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return true;
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}
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}
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}
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return false;
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}
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/**
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* The main program for the Classpath class.
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*
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* @param args The command line arguments.
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*/
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public static void main(String[] args)
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{
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if (args.length == 1)
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{
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System.out.print("The \"" + args[0] + "\" library was ");
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if (!Classpath.isLibInClassPath(args[0]))
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{
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System.out.print("NOT ");
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}
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System.out.println("found in the system class path.");
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}
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else
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{
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// e.g.: java -cp .;C:\jdk1.3\lib\tools.jar Classpath tools.jar
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System.err.println("Usage: java Classpath <library name>");
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}
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}
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}
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