SquirrelJME/SquirrelJME

// -*- Mode: Java; indent-tabs-mode: t; tab-width: 4 -*-
// ---------------------------------------------------------------------------
// 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.jvm.suite;

import cc.squirreljme.jvm.manifest.JavaManifest;
import cc.squirreljme.jvm.manifest.JavaManifestAttributes;
import cc.squirreljme.jvm.manifest.JavaManifestKey;
import java.util.AbstractList;
import java.util.ArrayList;
import java.util.List;

/**
 * This parses the entry points which are available for usage.
 *
 * @since 2017/08/20
 */
public class EntryPoints
    extends AbstractList<EntryPoint>
{
    /** Available entry points. */
    private final EntryPoint[] _entrypoints;
    
    /**
     * Initializes the entry points the hosted launcher can find.
     *
     * @param __man The manifest to parse.
     * @throws NullPointerException On null arguments.
     * @since 2018/03/24
     */
    public EntryPoints(JavaManifest __man)
        throws NullPointerException
    {
        this(__man.getMainAttributes());
    }
    
    /**
     * Initializes the entry points the hosted launcher can find.
     *
     * @param __attr The attributes to parse.
     * @throws NullPointerException On null arguments.
     * @since 2017/08/20
     */
    public EntryPoints(JavaManifestAttributes __attr)
        throws NullPointerException
    {
        // Check
        if (__attr == null)
            throw new NullPointerException("NARG");
        
        // Target list
        List<EntryPoint> target = new ArrayList<>();
        
        // Parse main class first
        String oldClass = __attr.get(new JavaManifestKey("Main-Class"));
        if (oldClass != null)
            target.add(new EntryPoint("Command Line", oldClass,
                null, false));
        
        // Parse MIDlet identifiers next
        for (int i = 1; i >= 1; i++)
        {
            // These are always in sequence
            String midletval = __attr.get(new JavaManifestKey(
                String.format("MIDlet-%d", i)));
            if (midletval == null)
                break;
            
            // The MIDlet field is in 3 fields: name, icon, class
            /* {@squirreljme.error DG03 Expected two commas in the MIDlet
            field.} */
            int pc = midletval.indexOf(','),
                sc = midletval.indexOf(',', Math.max(pc + 1, 0));
            if (pc < 0 || sc < 0)
                throw new RuntimeException("DG03");
        
            // Split fields
            String iconRc = midletval.substring(pc + 1, sc).trim();
            target.add(new EntryPoint(midletval.substring(0, pc).trim(),
                midletval.substring(sc + 1).trim(),
                (iconRc.isEmpty() ? null : iconRc), true));
        }
        
        // Finalize
        this._entrypoints = target.<EntryPoint>toArray(
            new EntryPoint[target.size()]);
    }
    
    /**
     * {@inheritDoc}
     * @since 2017/08/20
     */
    @Override
    public EntryPoint get(int __i)
    {
        return this._entrypoints[__i];
    }
    
    /**
     * {@inheritDoc}
     * @since 2017/08/20
     */
    @Override
    public int size()
    {
        return this._entrypoints.length;
    }
}