commanddispatcher.java

电信的网厅的整站代码

package com.doone.wskfmgr.common.command;

import java.util.Enumeration;
import java.util.Properties;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * Instances turn a request into a command, which may then be executed.
 *
 * @pattern Command (role=commandDispatcher)
 *
 * @generatedBy CodePro at 07-1-30 
H9:22
 *
 * @author wushaol
 *
 * @version $Revision$
 */
public class CommandDispatcher {

	/**
	 * The name of the servlet parameter specifying the command or action.
	 */
	private static final String ACTION_PARAMETER_NAME = "action";
	/**
	 * The servlet request.
	 */
	private HttpServletRequest request;
	/**
	 * The servlet response.
	 */
	private HttpServletResponse response;
	/**
	 * The properties associated with the request.
	 */
	private java.util.Properties properties;
	/**
	 * Create a new instance of the dispatcher containing the parameters from
	 * the servlet request.
	 *
	 * @param request the servlet request
	 * @param response the servlet response
	 */
	public CommandDispatcher(
		HttpServletRequest request,
		HttpServletResponse response) {
		this.request = request;
		this.response = response;
		this.properties = extractProperties(request);
	}
	/**
	 * Get the servlet request properties.
	 *
	 * @return the properties for the servlet request
	 */
	public Properties getProperties() {
		return properties;
	}
	/**
	 * Get the servlet request.
	 *
	 * @return the servlet request
	 */
	public HttpServletRequest getRequest() {
		return request;
	}
	/**
	 * Get the servlet response.
	 *
	 * @return the servlet response
	 */
	public HttpServletResponse getResponse() {
		return response;
	}
	/**
	 * Get the command specified by the servlet request.
	 *
	 * @return the command specified by the servlet request
	 */
	public CommandInterface getCommand() {
		String param = getProperties().getProperty(ACTION_PARAMETER_NAME);
		if (param == null) {
			return null;
		}
		return CommandFactory.getCommand(param);
	}
	/**
	 * @see RegistCommandInterface.executeCommand()
	 */
	public String executeCommand() throws Exception {
		CommandInterface command = getCommand();
		if (command == null)
			return null;
		return command.execute(this);
	}
	/**
	 * Translates servlet request properties to java properties.
	 *
	 * @param the servlet request object
	 *
	 * @return the servlet request properties
	 */
	private Properties extractProperties(HttpServletRequest servletrequest) {
		properties = new Properties();
		Enumeration enumeration = servletrequest.getParameterNames();
		while (enumeration.hasMoreElements()) {
			String name = (String) enumeration.nextElement();
			String value = servletrequest.getParameterValues(name)[0];
			properties.put(name, value);
		}
		return properties;
	}
}