analyzeportfolio.java

来自「100多M的J2EE培训内容」· Java 代码 · 共 196 行

package bible.ejb.session.example2;



import java.rmi.*;

import javax.ejb.*;

import java.util.*;

import javax.naming.*;


/**
 * Class AnalyzePortfolio
 *
 *
 * @author
 * @version %I%, %G%
 */
public class AnalyzePortfolio implements SessionBean {

  private SessionContext sessionContext;

  /**
   * Method ejbCreate
   *
   *
   */
  public void ejbCreate() {}

  /**
   * Method ejbRemove
   *
   *
   * @throws RemoteException
   *
   */
  public void ejbRemove() throws RemoteException {}

  /**
   * Method ejbActivate
   *
   *
   * @throws RemoteException
   *
   */
  public void ejbActivate() throws RemoteException {}

  /**
   * Method ejbPassivate
   *
   *
   * @throws RemoteException
   *
   */
  public void ejbPassivate() throws RemoteException {}

  /**
   * Method setSessionContext
   *
   *
   * @param sessionContext
   *
   * @throws RemoteException
   *
   */
  public void setSessionContext(SessionContext sessionContext)
    throws RemoteException {
    this.sessionContext = sessionContext;
  }

  // Internal state variables
  private HashMap holdings = new HashMap();
  private HashMap debts    = new HashMap();

  /**
   *  Adds a holding.
   */
  public void addHolding(String name, Integer amount) throws RemoteException {
    holdings.put(name, amount);
  }

  /**
   * Adds a debt.
   */
  public void addDebt(String name, Integer amount) throws RemoteException {
    debts.put(name, amount);
  }

  /**
   * Returns a detailed analysis of the current state.
   */
  public String getAnalysis() throws RemoteException {

    StringBuffer sb = new StringBuffer();

    sb.append("\n\n**Current Portfolio Analysis**\n");
    sb.append(analyzeMap("Your Holdings", holdings));
    sb.append(analyzeMap("Your Debts", debts));
    sb.append("  Total Cash Value: " + this.getTotalCash() + "\n");
    sb.append("Currently qualifies for Zeetrade Gold plan: "
              + this.qualifiesForGoldAccount());

    return sb.toString();
  }

  /**
   * Returns true if they have the financial strength to qualify for
   * a gold account.
   */
  public boolean qualifiesForGoldAccount() throws RemoteException {

    if (this.getGoldAccountMinimum() > this.getTotalCash()) {
      return false;
    } else {
      return true;
    }
  }

  /**
   * Checks the deployment descriptor for the minimum amount of
   * total cash is needed to qualify.
   */
  private int getGoldAccountMinimum() {

    InitialContext ctx     = null;
    Integer        minimum = new Integer(10000);  // 10000 for default.

    try {
      ctx     = new InitialContext();
      minimum = (Integer) ctx.lookup("java:comp/env/goldAccountMinimum");
    } catch (Exception e) {
      e.printStackTrace();
    } finally {
      try {
        ctx.close();
      } catch (Exception e) {}
    }

    return minimum.intValue();
  }
  private int getTotalCash() {
    return getTotalHoldings() - getTotalDebt();
  }
  private int getTotalHoldings() {
    return calculateTotal(holdings);
  }
  private int getTotalDebt() {
    return calculateTotal(debts);
  }
  private int calculateTotal(HashMap map) {

    Iterator iter  = map.values().iterator();
    int      total = 0;
    Integer  tmp   = null;

    while (iter.hasNext()) {
      tmp   = (Integer) iter.next();
      total += tmp.intValue();
    }

    return total;
  }
  private String analyzeMap(String name, HashMap map) {

    StringBuffer sb = new StringBuffer();

    sb.append("  **" + name + "**\n");

    Iterator iter   = map.keySet().iterator();
    String   key    = null;
    Integer  tmpInt = null;
    int      total  = 0;

    while (iter.hasNext()) {
      key    = (String) iter.next();
      tmpInt = (Integer) map.get(key);

      sb.append("    " + key + ": " + tmpInt.intValue() + "\n");

      total += tmpInt.intValue();
    }

    sb.append("  Total: " + total + "\n\n");

    return sb.toString();
  }
}


/*--- Formatted in Bible Style on Thu, Sep 6, '01 ---*/


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