SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// Multi-Phasic Applications: SquirrelJME
//     Copyright (C) Stephanie Gawroriski <xer@multiphasicapps.net>
// ---------------------------------------------------------------------------
// SquirrelJME is under the Mozilla Public License Version 2.0.
// See license.mkd for licensing and copyright information.
// ---------------------------------------------------------------------------

package cc.squirreljme.csv;

import java.io.IOException;
import java.util.Iterator;
import java.util.NoSuchElementException;

/**
 * Input stream for CSVs based on {@code Iterable}.
 *
 * @since 2023/09/12
 */
public class CsvIterableInputStream
    implements CsvInputStream
{
    /** The iterator used for accessing lines. */
    protected final Iterator<? extends CharSequence> iterator;
    
    /**
     * Initializes the input stream.
     *
     * @param __it The iterable to source from.
     * @throws NullPointerException On null arguments.
     * @since 2023/09/12
     */
    public CsvIterableInputStream(Iterable<? extends CharSequence> __it)
        throws NullPointerException
    {
        this(__it.iterator());
    }
    
    /**
     * Initializes the input stream.
     *
     * @param __it The iterable to source from.
     * @throws NullPointerException On null arguments.
     * @since 2023/09/14
     */
    public CsvIterableInputStream(Iterator<? extends CharSequence> __it)
        throws NullPointerException
    {
        if (__it == null)
            throw new NullPointerException("NARG");
        
        this.iterator = __it;
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/09/14
     */
    @Override
    public void close()
    {
        // Does nothing
    }
    
    /**
     * {@inheritDoc}
     * @since 2023/09/12
     */
    @Override
    public boolean next(StringBuilder __line)
        throws IOException, NullPointerException
    {
        if (__line == null)
            throw new NullPointerException("NARG");
        
        Iterator<? extends CharSequence> iterator = this.iterator;
        
        try
        {
            CharSequence from = (CharSequence)iterator.next();
            
            // Just grab the entire line, if there is one
            if (from != null)
                __line.append(from);
            
            return true;
        }
        catch (NoSuchElementException __ignored)
        {
            return false;
        }
    }
}