import java.io.*;
import java.util.Vector;

public class TagsCollection implements CollectionIF
{
	private String dbname;
	private Vector vTags;
	
	public TagsCollection( String filename )
	{
		dbname = filename;
		vTags = new Vector();
	}
			
	public int getNextID()
	{  
		if ( vTags.isEmpty() ) return 1;
		int nextid = ((Tags) (vTags.lastElement())).getID() + 1;
		System.out.println("nextid = " + nextid);
		return nextid;
	}
	
	public void addRecord( Vector v )
	{
		Tags Tag = new Tags();
		Tag.setID( (Integer.parseInt( (String)v.elementAt(0))));
		vTags.addElement( Tag );
	}
	
	public void loadRecords()
	{
		DataInputStream infile_Tag = null;
		
		Tags Tag;
		try
		{
			infile_Tag = new DataInputStream( new FileInputStream( dbname ) );
		}
		catch ( FileNotFoundException e ) {}
		
		while ( true )
		{
			Tag = new Tags();
			try
			{
				Tag.retrieve( infile_Tag );
				infile_Tag.readByte();
				vTags.addElement( Tag );
			}
			catch ( EOFException eof ) 
			{
				System.out.println("We have hit end of file!"); 
				break;
			}
			catch ( IOException e ){ }
		}
	}
	
	public void storeRecords()
	{
		DataOutputStream outfile_Tag = null;
		try 
		{
			outfile_Tag = new DataOutputStream( new FileOutputStream( dbname ) );
		}
		catch ( IOException e ) {}
	
		for ( int i = 0; i < vTags.size(); i++ )
		{
			Tags Tag = (Tags) vTags.elementAt( i );
			Tag.persist( outfile_Tag );
			try 
			{
				outfile_Tag.writeByte( (byte) '¬' );
			}
			catch ( IOException e ) {}
		}
	}
	
	public void modifyRecord( Vector v )
	{
		for ( int i = 0; i < vTags.size(); i++ )
			if ( ( (Tags) vTags.elementAt( i )).equals( v ) ) 
			{
				( (Tags) vTags.elementAt( i ) ).update( v );
			}
	}
	
	public void deleteRecord( int i )
	{
		vTags.removeElementAt( i );
	}

	public PersistentObject getRecord( int i )
	{
		return (PersistentObject) vTags.elementAt( i );
	}
	
	public PersistentObject getRecord( String tag )
	{
		for ( int i = 0; i < vTags.size(); i++ )
		{
			if ( ((Tags)(vTags.elementAt(i))).getTagText().equals( tag) )
				return (Tags)(vTags.elementAt(i));
		}
		return null;
	}
	
	public int size()
	{
		return vTags.size();
	}
}