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 cc.squirreljme.runtime.cldc.debug.Debugging;

/**
 * This indicates the type that a constant value is.
 *
 * @since 2018/05/16
 */
public enum ConstantValueType
{
    /** Integer. */
    INTEGER,
    
    /** Long. */
    LONG,
    
    /** Float. */
    FLOAT,
    
    /** Double. */
    DOUBLE,
    
    /** String. */
    STRING,
    
    /** Class. */
    CLASS,
    
    /* End. */
    ;
    
    /**
     * Checks if this value is compatible with the given field descriptor.
     *
     * @param __d The descriptor to check.
     * @return If it is compatible.
     * @throws NullPointerException On null arguments.
     * @since 2018/05/21
     */
    public final boolean isCompatibleWith(FieldDescriptor __d)
        throws NullPointerException
    {
        if (__d == null)
            throw new NullPointerException("NARG");
        
        switch (this)
        {
            case INTEGER:
                if (!__d.isPrimitive())
                    return false;
                switch (__d.primitiveType())
                {
                    case BOOLEAN:
                    case BYTE:
                    case SHORT:
                    case CHARACTER:
                    case INTEGER:
                        return true;
                        
                    default:
                        return false;
                }
            
            case LONG:
                return __d.isPrimitive() &&
                    __d.primitiveType().equals(PrimitiveType.LONG);
            
            case FLOAT:
                return __d.isPrimitive() &&
                    __d.primitiveType().equals(PrimitiveType.FLOAT);
            
            case DOUBLE:
                return __d.isPrimitive() &&
                    __d.primitiveType().equals(PrimitiveType.DOUBLE);
            
            case STRING:
                return __d.isObject() &&
                    "Ljava/lang/String;".equals(__d.toString()); 
            
            case CLASS:
                return __d.isObject() &&
                    "Ljava/lang/Class;".equals(__d.toString());
            
            default:
                throw Debugging.oops();
        }
    }
    
    /**
     * Is this a narrow constant value?
     *
     * @return If this is a narrow constant value.
     * @since 2108/09/08
     */
    public final boolean isNarrow()
    {
        switch (this)
        {
            case INTEGER:
            case FLOAT:
            case STRING:
            case CLASS:
                return true;
            
            default:
                return false;
        }
    }
    
    /**
     * Is this a wide constant value?
     *
     * @return If this is a wide constant value.
     * @since 2108/09/08
     */
    public final boolean isWide()
    {
        switch (this)
        {
            case LONG:
            case DOUBLE:
                return true;
            
            default:
                return false;
        }
    }
    
    /**
     * Returns the Java type for the constant value.
     *
     * @return The Java type that is used.
     * @since 2019/03/17
     */
    public final JavaType javaType()
    {
        switch (this)
        {
            case INTEGER:    return JavaType.INTEGER;
            case LONG:        return JavaType.LONG;
            case FLOAT:        return JavaType.FLOAT;
            case DOUBLE:    return JavaType.DOUBLE;
            case STRING:    return new JavaType(new FieldDescriptor(
                "Ljava/lang/String;"));
            case CLASS:        return new JavaType(new FieldDescriptor(
                "Ljava/lang/Class;"));
            
            default:
                throw Debugging.oops();
        }
    }
}