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// Copyright 2011-2012 David A. Greenbaum /*// w w w . j av a 2 s . c o m This file is part of Tip On Discount. Tip On Discount 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. Tip On Discount 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 Tip On Discount. If not, see <http://www.gnu.org/licenses/>. */ package com.itllp.tipOnDiscount.model.update; import java.math.BigDecimal; import com.itllp.tipOnDiscount.util.EqualsUtil; public class TippableAmountUpdate extends Update { private BigDecimal amount = BigDecimal.ZERO.setScale(2); public TippableAmountUpdate(BigDecimal amount) { this.amount = amount; } @Override public boolean equals(Object other) { //check for self-comparison if ( this == other ) return true; // use instanceof instead of getClass here for two reasons // 1. if need be, it can match any supertype, and not just one class; // 2. it renders an explict check for "that == null" redundant, since // it does the check for null already - "null instanceof [type]" always // returns false. (See Effective Java by Joshua Bloch.) if ( !(other instanceof TippableAmountUpdate) ) return false; //cast to native object is now safe TippableAmountUpdate otherTA = (TippableAmountUpdate)other; // now a proper field-by-field evaluation can be made return EqualsUtil.areEqual(this.amount, otherTA.amount); } public BigDecimal getAmount() { return this.amount; } public String toString() { return "TippableAmount(" + this.amount + ")"; } }