/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.openjpa.trader.domain;
import java.io.Serializable;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.OneToOne;
@SuppressWarnings("serial")
@Entity
public class Trade implements Serializable {
/**
* Primary identity of a committed trade.
* Its value is generated by the persistence provider.
* The application must not set or change this value.
* Hence no setter method is provided.
*/
@Id
@GeneratedValue
private Long id;
@Column(precision=10,scale=2)
private double price;
private int volume;
@OneToOne(cascade={CascadeType.MERGE,CascadeType.DETACH}, optional=false)
private Ask ask;
@OneToOne(cascade={CascadeType.MERGE,CascadeType.DETACH}, optional=false)
private Bid bid;
protected Trade() {
}
public Trade(Ask a, Bid b) {
if (a == null)
throw new NullPointerException("Can not create Trade with null Ask");
if (b == null)
throw new NullPointerException("Can not create Trade with null Bid");
if (a.getSeller() == null)
throw new NullPointerException("Can not create Trade with null trader for Ask");
if (b.getBuyer() == null)
throw new NullPointerException("Can not create Trade with null trader for Bid");
if (a.getSeller().equals(b.getBuyer()))
throw new IllegalArgumentException("Ask and Bid have same trader " + a.getSeller());
if (!a.getStock().equals(b.getStock())) {
throw new IllegalArgumentException("Stock (ask) " + a.getStock()
+ " does not match Stock (bid) " + b.getStock());
}
ask = a;
bid = b;
ask.setTrade(this);
bid.setTrade(this);
price = Math.max(a.getPrice(), b.getPrice());
volume = Math.min(a.getVolume(), b.getVolume());
}
public Long getId() {
return id;
}
public Trader getBuyer() {
return bid.getBuyer();
}
public Trader getSeller() {
return ask.getSeller();
}
public Stock getStock() {
return ask.getStock();
}
public double getPrice() {
return price;
}
public int getVolume() {
return volume;
}
@Override
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + ((id == null) ? 0 : id.hashCode());
return result;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Trade other = (Trade) obj;
if (id == null) {
if (other.id != null)
return false;
} else if (!id.equals(other.id))
return false;
return true;
}
public String toString() {
return "Trade-"+id;
}
}