package custom_management;

import java.util.Properties;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.InitialContext;

final class BuilderContext {
    private static final String ERROR_NULL_REMOTE = "Remote interface reference is null.  It must be created by calling one of the Home interface methods first.";
    private static final int MAX_OUTPUT_LINE_LENGTH = 100;

    /**
     * 獲得EJB容器的上下文環(huán)境
     * @return Context
     * @throws Exception
     */
    public static final Context getWeblogicServerInitialContext() throws Exception {
          String url = "t3://127.0.0.1:7001";
          String user = null;
          String password = null;
          Properties properties;
          try {
              properties = new Properties();
              properties.put(Context.INITIAL_CONTEXT_FACTORY,
                             "weblogic.jndi.WLInitialContextFactory");
              properties.put(Context.PROVIDER_URL, url);
              if (user != null) {
                  properties.put(Context.SECURITY_PRINCIPAL, user);
                  properties.put(Context.SECURITY_CREDENTIALS,
                                 password == null ? "" : password);
              }
              return new javax.naming.InitialContext(properties);
          } catch (Exception e) {
              log("Unable to connect to WebLogic server at " + url);
              log("Please make sure that the server is running.");
              throw e;
          }
    }
    /**
     * 獲得默認的，簡單的上下文環(huán)境
     * @return Context
     */
    public static final Context getSimpleInitialContext() {
      try {
        return new InitialContext();
      }
      catch (NamingException ex) {
        return null;
      }
    }
    /**
     * 信息輸出函數(shù)
     * @param message String
     */
    private static  final void log(String message) {

      if (message == null) {
          System.out.println("-- null");
      }
      if (message.length() > MAX_OUTPUT_LINE_LENGTH) {
          System.out.println("-- " +
                             message.substring(0, MAX_OUTPUT_LINE_LENGTH) +
                             " ...");
      } else {
          System.out.println("-- " + message);
      }
  }
}