程序员的量化交易之路（20）--Cointrader之Assert实体（8）

转载需说明出处：http://blog.csdn.net/minimicall, http://cloudtrade.top

任何可交易的都可以称之为Assert，资产。其类代码如下：

package org.cryptocoinpartners.schema;

import javax.persistence.Basic;

import javax.persistence.Cacheable;

import javax.persistence.Entity;

import javax.persistence.Transient;

import org.slf4j.Logger;

import org.slf4j.LoggerFactory;

 * Represents anything valuable and tradable, like currency or stock

 *任何有价值的并且可交易的物体，比如现金、股票

 * @author Tim Olson

@Entity //实体，说明在数据库中会建立相应的表格。由于没有使用name参数，说明类名就是表明。

@Cacheable //可缓存

public abstract class Asset extends EntityBase {

 public static Asset forSymbol(String symbol) {

 // only Currency is supported

 return Currency.forSymbol(symbol);

 @Basic(optional = false)

 public String getSymbol() {

 return symbol;

 @Basic(optional = false)

 public double getBasis() {

 return basis;

 @Transient

 public int getScale() {

 int length = (int) (Math.log10(Math.round(1 / basis)));

 return length;

 @Override

 public String toString() {

 return symbol;

 protected Asset(String symbol, double basis) {

 this.symbol = symbol;

 this.basis = basis;

 // JPA

 protected Asset() {

 protected void setSymbol(String symbol) {

 this.symbol = symbol;

 protected void setBasis(double basis) {

 this.basis = basis;

 private String symbol;//符号

 private double basis;//值

 private static Logger log = LoggerFactory.getLogger(Asset.class);

}