| /* |
| * Copyright 2005 Google Inc. |
| * |
| * 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 com.google.common.geometry; |
| |
| /** |
| * Like an Integer, but mutable :) |
| * |
| * Sometimes it is just really convenient to be able to pass a MutableInteger |
| * as a parameter to a function, or for synchronization purposes (so that you |
| * can guard access to an int value without creating a separate Object just to |
| * synchronize on). |
| * |
| * NOT thread-safe |
| * |
| */ |
| public class MutableInteger { |
| |
| private int value; |
| private Integer cachedIntegerValue = null; |
| |
| public MutableInteger(final int i) { |
| value = i; |
| } |
| |
| public int intValue() { |
| return value; |
| } |
| |
| public Integer integerValue() { |
| if (cachedIntegerValue == null) { |
| cachedIntegerValue = intValue(); |
| } |
| return cachedIntegerValue; |
| } |
| |
| @Override |
| public boolean equals(final Object o) { |
| return o instanceof MutableInteger && ((MutableInteger) o).value == this.value; |
| } |
| |
| @Override |
| public int hashCode() { |
| return integerValue().hashCode(); |
| } |
| |
| public void setValue(final int value) { |
| this.value = value; |
| cachedIntegerValue = null; |
| } |
| |
| public void increment() { |
| add(1); |
| } |
| |
| public void add(final int amount) { |
| setValue(value + amount); |
| } |
| |
| public void decrement() { |
| subtract(1); |
| } |
| |
| public void subtract(final int amount) { |
| add(amount * -1); |
| } |
| |
| @Override |
| public String toString() { |
| return String.valueOf(value); |
| } |
| } |