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What this is

This file is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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The source code

// $Header: /home/cvs/jakarta-jmeter/src/htmlparser/org/htmlparser/scanners/,v 1.2 2004/02/10 13:41:09 woolfel Exp $
 * ====================================================================
 * Copyright 2002-2004 The Apache Software Foundation.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

// The developers of JMeter and Apache are greatful to the developers
// of HTMLParser for giving Apache Software Foundation a non-exclusive
// license. The performance benefits of HTMLParser are clear and the
// users of JMeter will benefit from the hard work the HTMLParser
// team. For detailed information about HTMLParser, the project is
// hosted on sourceforge at
// HTMLParser was originally created by Somik Raha in 2000. Since then
// a healthy community of users has formed and helped refine the
// design so that it is able to tackle the difficult task of parsing
// dirty HTML. Derrick Oswald is the current lead developer and was kind
// enough to assist JMeter.

package org.htmlparser.scanners;

// Java Imports //
import java.util.Hashtable;

import org.htmlparser.tags.FrameTag;
import org.htmlparser.tags.Tag;
import org.htmlparser.util.LinkProcessor;
import org.htmlparser.util.ParserException;

 * Scans for the Frame Tag. This is a subclass of TagScanner, and is called using a
 * variant of the template method. If the evaluate() method returns true, that means the
 * given string contains an image tag. Extraction is done by the scan method thereafter
 * by the user of this class.
public class FrameScanner extends TagScanner
     * Overriding the default constructor
    public FrameScanner()
     * Overriding the constructor to accept the filter
    public FrameScanner(String filter)
     * Extract the location of the image, given the string to be parsed, and the url
     * of the html page in which this tag exists.
     * @param s String to be parsed
     * @param url URL of web page being parsed
    public String extractFrameLocn(Tag tag, String url) throws ParserException
            Hashtable table = tag.getAttributes();
            String relativeFrame = (String) table.get("SRC");
            if (relativeFrame == null)
                return "";
                return (new LinkProcessor()).extract(relativeFrame, url);
        catch (Exception e)
            String msg;
            if (tag != null)
                msg = tag.getText();
                msg = "null";
            throw new ParserException(
                "HTMLFrameScanner.extractFrameLocn() : Error in extracting frame location from tag "
                    + msg,

    public String extractFrameName(Tag tag, String url)
        return tag.getAttribute("NAME");

     * @see org.htmlparser.scanners.TagScanner#getID()
    public String[] getID()
        String[] ids = new String[1];
        ids[0] = "FRAME";
        return ids;

    protected Tag createTag(TagData tagData, Tag tag, String url)
        throws ParserException
        String frameUrl = extractFrameLocn(tag, url);
        String frameName = extractFrameName(tag, url);

        return new FrameTag(tagData, frameUrl, frameName);

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