Source Code : Method Lookup

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Method Lookup

       
File: context.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
    "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>

  <bean id="dataService" class="DataServiceImpl">
    <lookup-method name="getDataDao" bean="dataDao"/>
  </bean>

  <bean id="dataDao" singleton="false"
        class="StatefulDataDataDaoImpl">
  </bean>

</beans>


File: Main.java

import java.util.Date;
import java.util.GregorianCalendar;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

class Main {
  public static void main(String args[]) throws Exception {
    ApplicationContext ctx = new ClassPathXmlApplicationContext(
        "context.xml");
    DataService ws = (DataService) ctx.getBean("dataService");

    Double high = ws.getHistoricalHigh(new GregorianCalendar(2004, 0, 1).getTime());
    System.out.println("High was: " + high);

    ws = new DataServiceImpl() {
      protected DataDao getDataDao() {
        return null;
      }
    };
  }
}

abstract class DataServiceImpl implements DataService {

  protected abstract DataDao getDataDao();

  public Double getHistoricalHigh(Date date) {
    DataData wd = getDataDao().find(date);
    if (wd != null)
      return new Double(wd.getHigh());
    return null;
  }
}

interface DataService {
  Double getHistoricalHigh(Date date);
}

class DataData {

  Date date;

  double low;

  double high;
  public Date getDate() {
    return date;
  }

  public void setDate(Date date) {
    this.date = date;
  }

  public double getLow() {
    return low;
  }

  public void setLow(double low) {
    this.low = low;
  }

  public double getHigh() {
    return high;
  }

  public void setHigh(double high) {
    this.high = high;
  }
}

interface DataDao {

  DataData find(Date date);

  DataData save(Date date);

  DataData update(Date date);
}

class StatefulDataDataDaoImpl implements DataDao {

  public DataData find(Date date) {

    DataData wd = new DataData();
    wd.setDate((Date) date.clone());
    wd.setLow(5);
    wd.setHigh(15);
    return wd;
  }

  public DataData save(Date date) {
    throw new UnsupportedOperationException("This class uses static data only");
  }

  public DataData update(Date date) {
    throw new UnsupportedOperationException("This class uses static data only");
  }
}




           
       

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