/******************************************************************************* * 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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN * THE SOFTWARE. ******************************************************************************/ package org.luaj.vm2; /** * Extension of {@link LuaValue} which can hold a Java boolean as its value. * <p> * These instance are not instantiated directly by clients. * Instead, there are exactly twon instances of this class, * {@link LuaValue#TRUE} and {@link LuaValue#FALSE} * representing the lua values {@code true} and {@link false}. * The function {@link LuaValue#valueOf(boolean)} will always * return one of these two values. * <p> * Any {@link LuaValue} can be converted to its equivalent * boolean representation using {@link LuaValue#toboolean()} * <p> * @see LuaValue * @see LuaValue#valueOf(boolean) * @see LuaValue#TRUE * @see LuaValue#FALSE */ public final class LuaBoolean extends LuaValue { /** The singleton instance representing lua {@code true} */ static final LuaBoolean _TRUE = new LuaBoolean(true); /** The singleton instance representing lua {@code false} */ static final LuaBoolean _FALSE = new LuaBoolean(false); /** Shared static metatable for boolean values represented in lua. */ public static LuaValue s_metatable; /** The value of the boolean */ public final boolean v; LuaBoolean(boolean b) { this.v = b; } public int type() { return LuaValue.TBOOLEAN; } public String typename() { return "boolean"; } public boolean isboolean() { return true; } public LuaValue not() { return v ? FALSE : LuaValue.TRUE; } /** * Return the boolean value for this boolean * @return value as a Java boolean */ public boolean booleanValue() { return v; } public boolean toboolean() { return v; } public String tojstring() { return v ? "true" : "false"; } public boolean optboolean(boolean defval) { return this.v; } public boolean checkboolean() { return v; } public LuaValue getmetatable() { return s_metatable; } }