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.emulator.vm;

import cc.squirreljme.jvm.launch.VirtualJarPackageShelf;
import cc.squirreljme.jvm.mle.JarPackageShelf;
import cc.squirreljme.jvm.mle.brackets.JarPackageBracket;
import cc.squirreljme.jvm.mle.exceptions.MLECallError;
import cc.squirreljme.runtime.cldc.debug.Debugging;
import cc.squirreljme.vm.VMClassLibrary;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.util.Map;

/**
 * A fake version of {@link JarPackageShelf} for usage with -jar.
 *
 * @since 2024/01/06
 */
public class FakeJarPackageShelf
    implements VirtualJarPackageShelf
{
    /** The fake libraries. */
    private final JarPackageBracket[] _fakes;
    
    /**
     * Wraps the given suites with a fake package shelf.
     *
     * @param __suites The suites to wrap.
     * @throws NullPointerException On null arguments.
     * @since 2024/01/06
     */
    public FakeJarPackageShelf(Map<String, VMClassLibrary> __suites)
        throws NullPointerException
    {
        if (__suites == null)
            throw new NullPointerException("NARG");
        
        // Setup base fake array
        int n = __suites.size();
        JarPackageBracket[] fakes = new JarPackageBracket[n];
        
        // Fill it in with wrapped suites
        int at = 0;
        for (VMClassLibrary lib : __suites.values())
            fakes[at++] = new FakeJarPackageBracket(lib);
        
        // Store for later usage
        this._fakes = fakes;
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/06
     */
    @Override
    public boolean equals(JarPackageBracket __a, JarPackageBracket __b)
        throws MLECallError
    {
        if ((__a == null) != (__b == null))
            return false;
        else if (__a == null)
            return true;
        
        return ((FakeJarPackageBracket)__a).library ==
            ((FakeJarPackageBracket)__b).library;
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/06
     */
    @Override
    public JarPackageBracket[] libraries()
    {
        return this._fakes.clone();
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/06
     */
    @Override
    public String libraryPath(JarPackageBracket __jar)
        throws MLECallError
    {
        if (__jar == null)
            throw new MLECallError("NULL");
        
        VMClassLibrary lib = ((FakeJarPackageBracket)__jar).library;
        
        Path path = lib.path();
        if (path != null)
            return path.toString();
        
        return lib.name();
    }
    
    /**
     * {@inheritDoc}
     * @since 2024/01/06
     */
    @Override
    public InputStream openResource(JarPackageBracket __jar, String __rc)
        throws MLECallError
    {
        if (__jar == null || __rc == null)
            throw new MLECallError("NARG");
        
        try
        {
            return ((FakeJarPackageBracket)__jar).library
                .resourceAsStream(__rc);
        }
        catch (IOException __e)
        {
            throw new MLECallError(__e);
        }
    }
}