/*******************************************************************************
* 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;
}
}