@author Nilesh Phadke
@see edu.vt.marian.common.FullID
@see edu.vt.marian.common.WtdObj
@see edu.vt.marian.search.VectorWtdObjSet
*/
public class DienstClassManager implements NodeClassManager {
protected Debug debug; // The inevitable.
protected String DocFormat;
protected int ClassID;
protected Hashtable MarianDienstIDs=new Hashtable();
protected FullID F;
protected WtdObj weightedobj;
protected VectorWtdObjSet VObjSet;
protected int InstanceID;
protected String[] authors;
protected String[] titles;
protected String[] keywords;
protected String[] abstracts;
protected int authorsArrayIndex=0,titlesArrayIndex=0,keywordsArrayIndex=0,abstractsArrayIndex=0;
/**
* Constructor for DienstClassManager .. accepts the ClassID as input */
public DienstClassManager ( int Clid, Debug d )
{
debug = d;
ClassID=Clid;
int result=F.setClassID(ClassID);
if (result != ReturnCodes.OK) { System.out.println("ERROR"); }
DocFormat = new String("/text/html");
}
/**
The Following Function (i.e polishstring(String str) ) is require because .....
The syntax rules for URLs restrict a few characters to special roles. and require that if these characters are used in any other way that they be written as an escape
sequence, a percent sign followed by the character code in hexadecimal. The reserved characters are:
/ - separates components in the URL.
? - separates optional arguments from the rest of the URL
# - indicates reference to a named anchor within a document
= - separates name from value in an argument list
& - separates multiple arguments after a ?
Note that the slash character used in handles must be encoded when expressed in a URL. (The encoding is %2F, by the way.)
Finally, the space character may not appear anyplace. It must be written with a "+" (or with a percent sign escape sequence.)
*/
protected String polishstring(String str)
{
int index=0;
String outstring,tempstring;
char oldchar='/';
char newchar='%';
outstring=str;
//We need to replace / by %2F so we insert 2F after every occurence of / then finally we use the replace function to replace all / by %
index=outstring.indexOf("/",index);
while(index!=-1)
{
index=outstring.indexOf("/",index);
tempstring=(outstring.substring(0,index+1));
tempstring=tempstring.concat("2f"+outstring.substring(index+1));
outstring=tempstring;
index++;
index=outstring.indexOf("/",index);
}
outstring=outstring.replace('/','%');
//we need to replace all white spaces by '+'
outstring=outstring.replace(' ','+');
return(outstring);
}
/* Match Function has three main parts....
-> extract the information from Information passed onto it (InfoDesc) and convert it to a form useful for searching onto the Dienst System
-> using the search string formed in the previous step carry out the actual search on the Dienst System
-> capture the reply from the Dienst Server and corresponding to every unique document retrieved, create a Full ID and store the data in a table.
*/
public WtdObjSet match(InfoDesc description)
{
int thingstosearch=0;
Object firstobject, lastobject, currentobject;
int first, last, current;
// extracting info from infodesc
Enumeration linkDescsEnum = description.enumLinkDescs();
while( linkDescsEnum.hasMoreElements() )
{
currentobject= linkDescsEnum.nextElement();
LinkDesc currentLink = (LinkDesc) currentobject;
int currentClassID = currentLink.getClassID();
thingstosearch++;
InfoDesc stringDesc = currentLink.getKeyDesc();
String currentString = (String) stringDesc.getNodeDesc();
switch(currentClassID) {
case ClassIDs.CLASS_HAS_AUTHOR :
case ClassIDs.CLASS_HAS_CONF_AUTHOR :
case ClassIDs.CLASS_HAS_CORP_AUTHOR :
authors[authorsArrayIndex++]=currentString;
break;
case ClassIDs.CLASS_HAS_KEYWORD :
case ClassIDs.CLASS_HAS_SUBJECT : // this is to be considered as a keyword search in dienst ;
keywords[keywordsArrayIndex++]=currentString;
break;
case ClassIDs.CLASS_HAS_ABSTRACT :
abstracts[abstractsArrayIndex++]=currentString;
break;
case ClassIDs.CLASS_HAS_TITLE :
titles[titlesArrayIndex++]=currentString;
break;
default : thingstosearch--;
break;
} // end of switch
} //end of while
if(thingstosearch!=0)
{
try
{
search();
} catch (Exception e)
{
System.out.println("DienstClassManager.match(): exception " + e.toString() +
" while contacting remote server.");
return( null );
}
}
//return WtdObjSet
return( VObjSet );
} //end of match function
/*
The following Function just takes an int and converts it to a Integer. This is required because the put
function of Hashtable requires that the hashcode be of type java.lang.Object and does not allow to directly
use int as a hashcode for storing in the hashtable
*/
protected Integer intTOInteger( int val) {
Integer returninteger=new Integer(val);
return(returninteger);
}
protected void search() throws Exception {
String authorstring="",titlestring="",keywordstring="",abstractstring="",booleansearchstring="" ;
int i;
// forming the search string
if(authorsArrayIndex>=1)
{
authorstring="author="+authors[0];
for (i=1;i