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 net.multiphasicapps.classfile;

import java.lang.ref.Reference;
import java.lang.ref.SoftReference;

/**
 * This represents a set of flags which are used as modifiers to inner classes.
 *
 * @since 2018/05/15
 */
public final class InnerClassFlags
    extends Flags<InnerClassFlag>
    implements AccessibleFlags
{
    /** Standard class flag representation. */
    private Reference<ClassFlags> _cflags;
    
    /**
     * Initializes the inner class flags decoding from the specified bit field.
     *
     * @param __i The bit field to decode flags from.
     * @since 2018/05/15
     */
    public InnerClassFlags(int __i)
    {
        this(Flags.<InnerClassFlag>__decode(__i, InnerClassFlag.values()));
    }
    
    /**
     * Initializes the inner class flags.
     *
     * @param __fl The inner class flags.
     * @since 2018/05/15
     */
    public InnerClassFlags(InnerClassFlag... __fl)
    {
        super(InnerClassFlag.class, __fl);
        
        this.__checkFlags();
    }
    
    /**
     * Initializes the inner class flags.
     *
     * @param __fl The inner class flags.
     * @since 2018/05/15
     */
    public InnerClassFlags(Iterable<InnerClassFlag> __fl)
    {
        super(InnerClassFlag.class, __fl);
        
        this.__checkFlags();
    }
    
    /**
     * Returns the outer class representation for these flags.
     *
     * @return The outer class flag representation.
     * @since 2018/05/21
     */
    public final ClassFlags asClassFlags()
    {
        Reference<ClassFlags> ref = this._cflags;
        ClassFlags rv;
        
        if (ref == null || null == (rv = ref.get()))
        {
            int mask = 0;
            for (InnerClassFlag i : this)
            {
                ClassFlag v;
                switch (i)
                {
                    case PUBLIC:
                        v = ClassFlag.PUBLIC;
                        break;
                        
                    case FINAL:
                        v = ClassFlag.FINAL;
                        break;
                        
                    case INTERFACE:
                        v = ClassFlag.INTERFACE;
                        break;
                        
                    case ABSTRACT:
                        v = ClassFlag.ABSTRACT;
                        break;
                        
                    case SYNTHETIC:
                        v = ClassFlag.SYNTHETIC;
                        break;
                        
                    case ANNOTATION:
                        v = ClassFlag.ANNOTATION;
                        break;
                        
                    case ENUM:
                        v = ClassFlag.ENUM;
                        break;
                    
                    default:
                        continue;
                }
                
                if (v != null)
                    mask |= v.javaBitMask();
            }
            
            this._cflags = new SoftReference<>((rv = new ClassFlags(mask)));
        }
        
        return rv;
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/05/15
     */
    @Override
    public final boolean isPackagePrivate()
    {
        return !this.isPrivate() && !this.isProtected() && !this.isPublic();
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/05/15
     */
    @Override
    public final boolean isPrivate()
    {
        return this.contains(InnerClassFlag.PRIVATE);
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/05/15
     */
    @Override
    public final boolean isProtected()
    {
        return this.contains(InnerClassFlag.PROTECTED);
    }
    
    /**
     * {@inheritDoc}
     * @since 2018/05/15
     */
    @Override
    public final boolean isPublic()
    {
        return this.contains(InnerClassFlag.PUBLIC);
    }
    
    /**
     * Checks that the inner class flags are valid.
     *
     * @throws InvalidClassFormatException If the inner class flags are not
     * valid.
     * @since 2018/05/15
     */
    private void __checkFlags()
        throws InvalidClassFormatException
    {
        // Construct class flags which checks if they are valid
        try
        {
            this.asClassFlags();
        }
        catch (InvalidClassFormatException e)
        {
            /* {@squirreljme.error JC2y Inner class flags are not valid
            because they would produce invalid standard outer class
            flags. (The flags)} */
            throw new InvalidClassFormatException(String.format("JC2y %s",
                this), e);
        }
        
        /* {@squirreljme.error JC2z Multiple access modifiers, inner classes
        can only be one or none of private, protected, or public.
        (The flags)} */
        int count = (this.isPublic() ? 1 : 0) +
            (this.isProtected() ? 1 : 0) +
            (this.isPrivate() ? 1 : 0);
        if (count > 1)
            throw new InvalidClassFormatException(String.format("JC2z %s",
                this));
    }
}