| /* |
| * Copyright (c) 2010, Rickard Öberg. All Rights Reserved. |
| * |
| * 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.apache.zest.dci.moneytransfer.domain.data; |
| |
| import org.apache.zest.api.common.UseDefaults; |
| import org.apache.zest.api.injection.scope.State; |
| import org.apache.zest.api.mixin.Mixins; |
| import org.apache.zest.api.property.Property; |
| import org.apache.zest.library.constraints.annotation.GreaterThan; |
| |
| /** |
| * Maintain a balance for an account, of any type. Methods are in past tense, |
| * and are considered events. Only minimal sanity checks are performed. |
| * The roles invoking these methods decide if it's ok to perform the change or not. |
| */ |
| @Mixins( BalanceData.Mixin.class ) |
| public interface BalanceData |
| { |
| void increasedBalance( @GreaterThan( 0 ) Integer amount ); |
| |
| void decreasedBalance( @GreaterThan( 0 ) Integer amount ); |
| |
| Integer getBalance(); |
| |
| // Default implementation |
| |
| class Mixin |
| implements BalanceData |
| { |
| @State |
| @UseDefaults |
| Property<Integer> balance; |
| |
| public void increasedBalance( Integer amount ) |
| { |
| balance.set( balance.get() + amount ); |
| } |
| |
| public void decreasedBalance( Integer amount ) |
| { |
| balance.set( balance.get() - amount ); |
| } |
| |
| public Integer getBalance() |
| { |
| return balance.get(); |
| } |
| } |
| } |