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/*******************************************************************************
 * Copyright (c) 2009-2011 Luaj.org. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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package nl.weeaboo.lua2.vm;

import java.io.Serializable;

import nl.weeaboo.lua2.LuaRunState;

/**
 * Base class for representing numbers as lua values directly.
 * 
 * The main subclasses are {@link LuaInteger} which holds values that fit in a
 * java int, and {@link LuaDouble} which holds all other number values.
 *
 * @see LuaInteger
 * @see LuaDouble
 * @see LuaValue
 *
 */
public abstract class LuaNumber extends LuaValue implements Serializable {

    private static final long serialVersionUID = 1L;

    @Override
    public int type() {
        return LuaConstants.TNUMBER;
    }

    @Override
    public String typename() {
        return "number";
    }

    @Override
    public LuaNumber checknumber() {
        return this;
    }

    @Override
    public LuaNumber checknumber(String errmsg) {
        return this;
    }

    @Override
    public LuaNumber optnumber(LuaNumber defval) {
        return this;
    }

    @Override
    public LuaValue tonumber() {
        return this;
    }

    @Override
    public boolean isnumber() {
        return true;
    }

    @Override
    public boolean isstring() {
        return true;
    }

    @Override
    public LuaValue getmetatable() {
        return LuaRunState.getCurrent().getMetatables().getNumberMetatable();
    }

    @Override
    public LuaValue concat(LuaValue rhs) {
        return rhs.concatTo(this);
    }

    @Override
    public Buffer concat(Buffer rhs) {
        return rhs.concatTo(this);
    }

    @Override
    public LuaValue concatTo(LuaNumber lhs) {
        return strvalue().concatTo(lhs.strvalue());
    }

    @Override
    public LuaValue concatTo(LuaString lhs) {
        return strvalue().concatTo(lhs);
    }

}