/* 
	SearchResultsCollector.java - October 1999 - Scott Parent
*/
import java.util.*;
import java.io.IOException;

/**
 * This class is designed to be packaged with a COM DLL output format.
 * The class has no standard entry points, other than the constructor.
 * Public methods will be exposed as methods on the default COM interface.
 * @com.register ( clsid=3BC0D8AA-8981-11D3-91AE-004095013729, typelib=3BC0D8AB-8981-11D3-91AE-004095013729 )
 */
public class SearchResultsCollector extends Thread
{
	// m_MaxIndex property - 11/09/99 - Deric Bertrand
	private int m_MaxIndex;
	private SearchEngineFacade m_Engine = null;
	private Vector m_Collection = new Vector();
	private String m_queryText = null;
	
	private Exception m_lastException = null;
	
	// state management
	// Changed scope of state constants to class (static) - 11/09/99 - Deric Bertrand
	public static final int S_New = 0;
	public static final int S_Ready = 1;
	public static final int S_Running = 2;
	public static final int S_Done = 3;
	public static final int S_Exception = 4;
	private int m_state = S_New;
	
	public SearchResultsCollector()	// default constructor
	{
		m_Engine = new AltaVistaFacade();
		m_MaxIndex = 190;	// Initialize property - 11/09/99 - Deric Bertrand

	}
	
	public SearchEngineFacade getEngine()
	{
		return m_Engine;
	}

	public Exception getLastException()
	{
		return m_lastException;
	}

	public SearchResult getSearchResult( int index)
	{
		if( index < m_Collection.size())
			return (SearchResult)m_Collection.elementAt( index);
		else
			return null;
	}
	public int getCount() { return m_Collection.size();}
	public int getState() { return m_state;}
	public String getQueryText() { return m_queryText;}
	public void setEngine(SearchEngineFacade anEngine)
	{
		m_Engine = anEngine;
	}
	
	// Method to set max index property - 11/09/99 - Deric Bertrand
	public void setMaxIndex(int newMaxIndex)
	{
		m_MaxIndex = newMaxIndex;
	}

	public void setQueryText( String newText) throws IllegalStateException
	{
		if( getState() < S_Running)
		{
			m_queryText = newText;
			m_state = S_Ready;
		} else
			throw new IllegalStateException(
				"Query text cannot be changed once result collection is started"
			);
	}
	public void run()
	{
		if( getState() == S_Ready)
		{
			int listingIndex = 0;	// Bug fix - 11/09/99 - Deric Bertrand
			int resultCount = 0;
			
			for( m_state = S_Running; m_state == S_Running; listingIndex += resultCount)
			{
				try {
					resultCount = m_Engine.SubmitQuery( m_queryText, listingIndex,
						m_Collection);
					// Bounds checking - 11/09/99 - Deric Bertrand	
					// Bug Fix - 11/11/99 - Deric Bertrand	
					if( resultCount == 0 || (resultCount + listingIndex) > m_MaxIndex)
						m_state = S_Done;
				} catch( IOException x)
				{
					m_state = S_Exception;
					m_lastException = x;
				}
				// Exception handling - 11/09/99 - Deric Bertrand	
				  catch( java.text.ParseException x)
				{
					m_state = S_Exception;
					m_lastException = x;
				}
				// Exception handling - 11/11/99 - Deric Bertrand	
				  catch( Exception x)
				{
					m_state = S_Exception;
					m_lastException = x;
				}
			}
		}
	}
}