source: trunk/gsdl3/src/java/org/greenstone/gsdl3/gs3build/util/HTMLDocLocalHeading.java@ 7306

package org.greenstone.gsdl3.gs3build.util;



import java.util.*;



public class HTMLDocLocalHeading

{   String      heading;

    HTMLBlock   block;



    public HTMLDocLocalHeading(HTMLDoc doc, String local)

    {   HTMLBlock               nextheading, lastheading, anchor;

        Enumeration             headings;

        HTMLDocAnchorList   anchors;

        HTMLBlock                   docBlock;

        int                             _start, _end, _pos;



        // initialise (to undefined)

        this.heading    = null;

        this.block      = null;



        // get anchors

        anchors = new HTMLDocAnchorList(doc);

        anchor  = anchors.localAnchor(local);

        if (anchor == null)

        {   return;

        }



        // get headings position; lastheading will be previous, nextheading will be next

        headings        = doc.headings();

        lastheading = null;

        nextheading = null;



        while (headings.hasMoreElements())

        {   nextheading = (HTMLBlock) headings.nextElement();

            if (nextheading.startPos() > anchor.startPos())

            {   break;

            }

            



            lastheading = nextheading;

        }



        // didn't get any actual headings; abort.

        if (nextheading == null)

        {   return;

        }



        // got to the end

        if (nextheading == lastheading)

        {   this.block = nextheading;

        }

        else

        {   // now see where anchor is; try to find null textual content between anchor

            // and heading

            docBlock    = doc.getCodedContent();

            _start      = docBlock.find(anchor);

            _end            = docBlock.find(nextheading);

            for (_pos = _start; _pos < _end; _pos ++)

            {   // HTML tag

                if (docBlock.elementAt(_pos) instanceof HTMLTag)

                {   

                }

                // HTML text - if non-blank, abort

                else

                {   if (((HTMLCText) docBlock.elementAt(_pos)).nullString() == false)

                    {   break;

                    }

                }

            }



            // assign

            if (_pos != _end)

            {   this.block  =   lastheading;

            }

            else

            {   this.block  = nextheading;

            }

        }

        this.heading    = this.block.toString();

    }



    public String toString()

    {   return this.heading;

    }



    public HTMLBlock block()

    {   return this.block;

    }



    protected void finalize() throws Throwable

    {   this.heading    = null;

        this.block      = null;

        super.finalize();

    }

}