eventinstance.java

一个用 java写的wap浏览器 对于浏览器感兴趣起的可以看看咯

/*
 * j2wap is distributed under the terms of the GNU Public License
 *
 *  j2wap was written by:
 *
 *	        Scott Campbell
 *			Michael Nordling
 *			Karl Maftoum
 * 			Julian Bright
 *
 *			This was a final project for Comp.Engineering at the University of Canberra, Australia
 *
 *			Now released as Open Source software. 28 November 2000
 *
 *			Email: [e-mail] for more info
 *
 *			Use entirely at your own risk.
 */

 package wae;
import java.util.Stack;

/**
 * A storage class for events used by EventManagement.<br>
 * Company: J2wap.com
 * @author  Julian Bright
 * @version 1.1
 */
public class EventInstance
{

  /** Event Instance Type */
  private int c_intEventType;
  /** Variable stack for Event Instance */
  private Stack c_clsVariableStack;
  /** URL associated with Event Instance */
  private String c_strURL;

  /**
   * Event Instance constructor initialises local variables.
   * @param in_intEventType For the particular event.
   */
  public EventInstance(int in_intEventType)
  {
    c_intEventType = in_intEventType;
    c_clsVariableStack = new Stack();
  }

  /**
   * Constructor: This constructor is needed so that the "GoEventInstance"
   * class will compile. It will create "c_clsVariableStack", hence it is
   * the responsibility of the child class to set "intEventType".
   */
  public EventInstance()
  {
    c_clsVariableStack = new Stack();
  }

  /**
   * Returns the event type for the current instance
   * @return One of the following event types:
   * <ol>
   * <li>Go - Preforms a Go on a URL
   * <li>Prev - Returns to the last URL
   * <li>Refresh - Refreshes the current URL
   * <li>Noop - Doesn't perform any operation
   * </ol>
   */
  public int getEventType()
  {
    return c_intEventType;
  }

  /**
   * Sets the URL for the go event.
   * @param in_strURL The URL associated with this event instance.
   */
  public void setURL(String in_strURL)
  {
    c_strURL = new String(in_strURL);

    System.out.println("EventInstance::setURL => " + c_strURL);
  }

  /**
   * Returns the URL for the operation.
   * @return The URL associated with this event instance.
   */
  public String getURL()
  {
    return c_strURL;
  }

  /**
   * Adds a variable to the variable hashtable.
   * @param in_strName The name of the new variable.
   * @param in_strValue The value associated with the name.
   */
  public void addVariable(String in_strName,
                          String in_strValue)
  {
    c_clsVariableStack.push(in_strValue);
    c_clsVariableStack.push(in_strName);
  }

  /**
   * Set all variables in the the referenced Browser Context stack.
   * @param in_clsBrowserContext The browser context reference to variable stack.
   */
  public void setVariablesInStack(BrowserContext in_clsBrowserContext)
  {
    String strName;
    String strVal;

    while (!c_clsVariableStack.empty())
    {
      strName = (String)c_clsVariableStack.pop();
      strVal = (String)c_clsVariableStack.pop();

      // Check the name and value for variable references.
      if (strName.charAt(0) == '$')
        strName = in_clsBrowserContext.getVariable(strName.substring(1));
      if (strVal.charAt(0) == '$')
        strVal = in_clsBrowserContext.getVariable(strVal.substring(1));

      // Set the variable.
      in_clsBrowserContext.setVariable(strName, strVal);
    } // while
  }

} // class EventInstance