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Box.java
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53 lines (44 loc) · 1.24 KB
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/*
* Copyright (c) 2017, Fernando Miguel Carvalho, mcarvalho@cc.isel.ipl.pt
*
* 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 org.jayield.boxes;
/**
* @author Miguel Gamboa
* created on 06-07-2017
*/
public class Box<T> {
protected T value;
private boolean isPresent;
public Box(T identity) {
this.value = identity;
this.isPresent = true;
}
public Box() {
}
public final boolean isPresent() {
return isPresent;
}
public final T getValue() {
return value;
}
public final T setValue(T value) {
this.value = value;
return value;
}
public final void turnPresent(T e) {
this.setValue(e);
this.isPresent = true;
}
}