net.sandius.rembulan.impl.DefaultUserdata Maven / Gradle / Ivy
/*
* Copyright 2016 Miroslav Janíček
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package net.sandius.rembulan.impl;
import net.sandius.rembulan.Table;
import net.sandius.rembulan.Userdata;
/**
* Default implementation of full userdata.
*/
public abstract class DefaultUserdata extends Userdata {
private Table mt;
private Object userValue;
/**
* Constructs a new instance of this userdata with the specified initial {@code metatable}
* and {@code userValue}.
*
* @param metatable initial metatable, may be {@code null}
* @param userValue initial user value, may be {@code null}
*/
public DefaultUserdata(Table metatable, Object userValue) {
this.mt = metatable;
this.userValue = userValue;
}
@Override
public Table getMetatable() {
return mt;
}
@Override
public Table setMetatable(Table mt) {
Table old = this.mt;
this.mt = mt;
return old;
}
@Override
public Object getUserValue() {
return userValue;
}
@Override
public Object setUserValue(Object value) {
Object oldValue = userValue;
this.userValue = value;
return oldValue;
}
}