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/*
* esodata - data structures and other things, of varying utility
* Copyright 2022, Ben Culkin
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
package bjc.data;
/**
* A toggle that will only give the first value once, only yielding the second
* value afterwards.
*
* @author student
*
* @param <E>
* The type of value stored
*/
public class OneWayToggle<E> implements Toggle<E> {
private E first;
private E second;
private boolean gotFirst;
/**
* Create a new one-way toggle
*
* @param first
* The value to offer first, and only once
* @param second
* The value to offer second and repeatedly
*/
public OneWayToggle(E first, E second) {
this.first = first;
this.second = second;
}
@Override
public E get() {
if (gotFirst) return second;
gotFirst = true;
return first;
}
@Override
public E peek() {
if (gotFirst) return second;
else return first;
}
@Override
public void set(boolean gotFirst) {
this.gotFirst = gotFirst;
}
}
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