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// ========================================================================
// Copyright (c) 2002 Mort Bay Consulting (Australia) Pty. Ltd.
// $Id: Classpath.java 6177 2007-02-19 10:11:27Z aaime $
// ========================================================================
package org.mortbay.start;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.util.StringTokenizer;
import java.util.Vector;


/**
 * Class to handle CLASSPATH construction
 * @author Jan Hlavat�
 */
public class Classpath {
    Vector _elements = new Vector();

    public Classpath() {
    }

    public Classpath(String initial) {
        addClasspath(initial);
    }

    public boolean addComponent(String component) {
        if ((component != null) && (component.length() > 0)) {
            try {
                File f = new File(component);

                if (f.exists()) {
                    File key = f.getCanonicalFile();

                    if (!_elements.contains(key)) {
                        _elements.add(key);

                        return true;
                    }
                }
            } catch (IOException e) {
            }
        }

        return false;
    }

    public boolean addComponent(File component) {
        if (component != null) {
            try {
                if (component.exists()) {
                    File key = component.getCanonicalFile();

                    if (!_elements.contains(key)) {
                        _elements.add(key);

                        return true;
                    }
                }
            } catch (IOException e) {
            }
        }

        return false;
    }

    public boolean addClasspath(String s) {
        boolean added = false;

        if (s != null) {
            StringTokenizer t = new StringTokenizer(s, File.pathSeparator);

            while (t.hasMoreTokens()) {
                added |= addComponent(t.nextToken());
            }
        }

        return added;
    }

    public String toString() {
        StringBuffer cp = new StringBuffer(1024);
        int cnt = _elements.size();

        if (cnt >= 1) {
            cp.append(((File) (_elements.elementAt(0))).getPath());
        }

        for (int i = 1; i < cnt; i++) {
            cp.append(File.pathSeparatorChar);
            cp.append(((File) (_elements.elementAt(i))).getPath());
        }

        return cp.toString();
    }

    public ClassLoader getClassLoader() {
        int cnt = _elements.size();
        URL[] urls = new URL[cnt];

        for (int i = 0; i < cnt; i++) {
            try {
                urls[i] = ((File) (_elements.elementAt(i))).toURL();
            } catch (MalformedURLException e) {
            }
        }

        ClassLoader parent = Thread.currentThread().getContextClassLoader();

        if (parent == null) {
            parent = Classpath.class.getClassLoader();
        }

        if (parent == null) {
            parent = ClassLoader.getSystemClassLoader();
        }

        return new URLClassLoader(urls, parent);
    }
}