AppletFinder.java Source code

Introduction

Here is the source code for AppletFinder.java

Source

/*
 * Copyright (c) Ian F. Darwin, http://www.darwinsys.com/, 1996-2002.
 * All rights reserved. Software written by Ian F. Darwin and others.
 * $Id: LICENSE,v 1.8 2004/02/09 03:33:38 ian Exp $
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * 
 * Java, the Duke mascot, and all variants of Sun's Java "steaming coffee
 * cup" logo are trademarks of Sun Microsystems. Sun's, and James Gosling's,
 * pioneering role in inventing and promulgating (and standardizing) the Java 
 * language and environment is gratefully acknowledged.
 * 
 * The pioneering role of Dennis Ritchie and Bjarne Stroustrup, of AT&T, for
 * inventing predecessor languages C and C++ is also gratefully acknowledged.
 */

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Vector;

/**
 * Get list of APPLET tags in one HTML file.
 * 
 * @author Ian Darwin, Darwin Open Systems, www.darwinsys.com. Routine "readTag"
 *         shamelessly stolen from Elliott Rusty Harold's "ImageSizer" program.
 */
public class AppletFinder {

    public static void main(String[] av) {
        String[] tags = new AppletFinder().doPage(av[0]);
        for (int i = 0; i < tags.length; i++)
            System.out.println("APPLET: " + i + " " + tags[i]);
    }

    public String[] doPage(String pageURL) {
        String result[] = null;
        URL root;

        if (pageURL != null) {
            //Open the URL for reading
            try {
                if (pageURL.indexOf(":") != -1) {
                    root = new URL(pageURL);
                } else {
                    root = new URL("http://" + pageURL);
                }
                result = findApplets(root);
            } catch (MalformedURLException e) {
                System.err.println(pageURL + " is not a parseable URL");
                System.err.println(e);
            }
        }
        return result;
    }

    public String[] findApplets(URL u) {
        BufferedReader inrdr = null;
        Vector v = new Vector();
        char thisChar = 0;

        try {
            inrdr = new BufferedReader(new InputStreamReader(u.openStream()));
            int i;
            while ((i = inrdr.read()) != -1) {
                thisChar = (char) i;
                if (thisChar == '<') {
                    String tag = readTag(inrdr);
                    // System.out.println("TAG: " + tag);
                    if (tag.toUpperCase().startsWith("<APPLET"))
                        v.addElement(tag);
                }
            }
            inrdr.close();
        } catch (IOException e) {
            System.err.println("Error reading from main URL: " + e);
        }
        String applets[] = new String[v.size()];
        v.copyInto(applets);
        return applets;
    }

    public String readTag(BufferedReader is) {
        StringBuffer theTag = new StringBuffer("<");
        char theChar = '<';

        try {
            while (theChar != '>' && ((theChar = (char) is.read()) != -1)) {
                theTag.append(theChar);
            } // end while
        } // end try
        catch (IOException e) {
            System.err.println(e);
        }

        return theTag.toString();
    }
}