/*
* 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;
/**
* A pair of matching offer to {@linkplain Bid buy} and {@linkplain Ask sell}.
* This is <em>not</em> a persistent entity. But it is in the persistent domain
* because it is often is the result of query.
*
* @author Pinaki Poddar
*
*/
@SuppressWarnings("serial")
public class Match implements Serializable {
private Ask ask;
private Bid bid;
/**
* A no-arg constructor to comply to GWT compiler.
*/
protected Match() {
}
/**
* Constructs a pair with matching offers.
* @param a the offer to sell. Must not be null.
* @param b the offer to buy. Must not be null.
*/
public Match(Ask a, Bid b) {
if (a == null)
throw new NullPointerException("Can not create Match with null Ask");
if (b == null)
throw new NullPointerException("Can not create Match with null Bid");
if (a.getSeller().equals(b.getBuyer())) {
throw new NullPointerException("Can not create Match with same Trader "
+ a.getSeller() + " for Ask and Bid");
}
if (a.getPrice() > b.getPrice()) {
throw new IllegalArgumentException("Ask price " + a.getPrice() + " is greater than "
+ " Bid price " + b.getPrice());
}
ask = a;
bid = b;
}
/**
* Gets the matching offer to sell.
*
* @return the matching offer to sell. Never null.
*/
public Ask getAsk() {
return ask;
}
/**
* Gets the matching offer to buy.
*
* @return the matching offer to buy. Never null.
*/
public Bid getBid() {
return bid;
}
public String toString() {
return "Match ["+ ask + " and " + bid + "]";
}
}