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.emulator;

import cc.squirreljme.jvm.mle.brackets.JarPackageBracket;
import cc.squirreljme.jvm.mle.exceptions.MLECallError;
import cc.squirreljme.vm.VMClassLibrary;
import java.io.IOException;
import java.io.InputStream;

/**
 * This is an emulation of {@link JarPackageBracket} so that it can access
 * the path and such accordingly.
 *
 * @since 2020/10/31
 */
public class EmulatedJarPackageBracket
    implements JarPackageBracket
{
    /** The virtual machine library to wrap around. */
    protected final VMClassLibrary vmLib;
    
    /**
     * Initializes the emulated bracket.
     * 
     * @param __vmLib The virtual machine library.
     * @throws NullPointerException On null arguments.
     * @since 2020/10/31
     */
    public EmulatedJarPackageBracket(VMClassLibrary __vmLib)
        throws NullPointerException
    {
        if (__vmLib == null)
            throw new NullPointerException("NARG");
        
        this.vmLib = __vmLib;
    }
    
    /**
     * Opens the specified resource.
     * 
     * @param __rc The resource to open.
     * @return The stream to the resource data.
     * @throws NullPointerException On null arguments.
     * @since 2020/10/31
     */
    public InputStream openResource(String __rc)
        throws NullPointerException
    {
        try
        {
            return this.vmLib.resourceAsStream(__rc);
        }
        catch (IOException e)
        {
            throw new MLECallError("I/O Exception.", e);
        }
    }
}