// $Header: /home/cvs/jakarta-jmeter/src/htmlparser/org/htmlparser/scanners/ImageScanner.java,v 1.5 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* 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 http://htmlparser.sourceforge.net/.
//
// 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.ImageTag;
import org.htmlparser.tags.Tag;
import org.htmlparser.tags.data.TagData;
import org.htmlparser.util.LinkProcessor;
import org.htmlparser.util.ParserException;
import org.htmlparser.util.ParserUtils;
/**
* Scans for the Image 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 ImageScanner extends TagScanner
{
public static final String IMAGE_SCANNER_ID = "IMG";
private Hashtable table;
private LinkProcessor processor;
/**
* Overriding the default constructor
*/
public ImageScanner()
{
super();
processor = new LinkProcessor();
}
/**
* Overriding the constructor to accept the filter
*/
public ImageScanner(String filter, LinkProcessor processor)
{
super(filter);
this.processor = processor;
}
/**
* 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 extractImageLocn(Tag tag, String url) throws ParserException
{
String relativeLink = null;
try
{
table = tag.getAttributes();
relativeLink = (String) table.get("SRC");
if (relativeLink != null)
{
relativeLink = ParserUtils.removeChars(relativeLink, '\n');
relativeLink = ParserUtils.removeChars(relativeLink, '\r');
}
if (relativeLink == null || relativeLink.length() == 0)
{
// try fix
String tagText = tag.getText().toUpperCase();
int indexSrc = tagText.indexOf("SRC");
if (indexSrc != -1)
{
// There is a missing equals.
tag.setText(
tag.getText().substring(0, indexSrc + 3)
+ "="
+ tag.getText().substring(
indexSrc + 3,
tag.getText().length()));
table = tag.redoParseAttributes();
relativeLink = (String) table.get("SRC");
}
}
if (relativeLink == null)
return "";
else
return processor.extract(relativeLink, url);
}
catch (Exception e)
{
throw new ParserException(
"HTMLImageScanner.extractImageLocn() : Error in extracting image location, relativeLink = "
+ relativeLink
+ ", url = "
+ url,
e);
}
}
public String[] getID()
{
String[] ids = new String[1];
ids[0] = IMAGE_SCANNER_ID;
return ids;
}
protected Tag createTag(TagData tagData, Tag tag, String url)
throws ParserException
{
String link = extractImageLocn(tag, url);
return new ImageTag(tagData, link);
}
}