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Date: Wed, 30 Aug 2006 09:48:23 -0700 (PDT)
From: "Miguel Montes (JIRA)" <jira@apache.org>
To: harmony-commits@incubator.apache.org
Subject: [jira] Created: (HARMONY-1350) [classlib][html] The method
 j.s.t.h.p.ContentModel.first() returns a value in cases in which it should
 return null
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[classlib][html] The method j.s.t.h.p.ContentModel.first() returns a value in cases in which it should return null
------------------------------------------------------------------------------------------------------------------

                 Key: HARMONY-1350
                 URL: http://issues.apache.org/jira/browse/HARMONY-1350
             Project: Harmony
          Issue Type: Bug
          Components: Classlib
            Reporter: Miguel Montes
         Attachments: ContentModel01.patch

The class ContentModel is a representation of a restricted BNF expression, for instance, (meta & base). The method first() returns the element that MUST be next. In the previous example, there is no such element. Both, meta and base, can be next. With this content model the RI returns null, buth the implementation in harmony returns  'base'. The test code provided is different for both implementations, because the internal representations are also different (issue HARMONY-1272)
==============================java code for harmony ============================
import java.io.IOException;
import javax.swing.text.html.parser.*;
public class TestContentModelHarmony {
	public static void main(String[] args) throws IOException {
		DTD dtd = DTD.getDTD("tmp");
        ContentModel model1 = new ContentModel (dtd.getElement(2));
        ContentModel model2 = new ContentModel (dtd.getElement(3));
        ContentModel model = new ContentModel ('&', model1, model2);
		System.out.println("ContentModel: " + model+ " First: "+model.first());
	}
}

=============================java code for RI============================
import java.io.IOException;
import javax.swing.text.html.parser.*;
public class TestContentModelSun {
	public static void main(String[] args) throws IOException {
		DTD dtd = DTD.getDTD("tmp");
		ContentModel model1 = new ContentModel(dtd.getElement(3));
		ContentModel model2 = new ContentModel(0, dtd.getElement(2), model1);
		ContentModel model = new ContentModel('&', model2);
		System.out.println("ContentModel: " + model+ " First: "+model.first());
	}
}
=====================================================================
Output
$ java -showversion TestContentModelSun
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode)

ContentModel: (meta & base) First: null

$/harmony-hdk-r431938/jdk/jre/bin/java -showversion TestContentModelHarmony
java version "1.5.0"
pre-alpha : not complete or compatible
svn = r431938, (Aug 16 2006), Linux/ia32/gcc 3.4.6, release build
http://incubator.apache.org/harmony
ContentModel: META&BASE First: javax.swing.text.html.parser.Element[index=3,name=BASE,oStart=false,oEnd=false,inclusions=null,exclusions=null,type=19,content=null,atts=null,data=null]


Attached is a patch


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