viewspropertiesreader.java

pojo的mvc框架

package xyz.frame.webapp;

import java.io.IOException;
import java.io.InputStream;
import java.util.Properties;

import org.apache.log4j.Logger;
import xyz.frame.view.OverridenViewManager;
import xyz.frame.view.ViewManager;

/**
 * Reads a view properties file and gives back a new ViewManager based on the
 * current one
 */
public class ViewsPropertiesReader {
	private static final Logger logger = Logger
			.getLogger(ViewsPropertiesReader.class);

	/**
	 * Creates a new view manager which overrides all view properties in the
	 * resource with their new values... old values will use the current
	 * manager's response
	 * 
	 * @param currentManager
	 *            default manager
	 * @param resource
	 *            properties resource
	 * @return the new view manager
	 * @throws IOException
	 */
	public ViewManager overrideViews(ViewManager currentManager,
			InputStream resource) throws IOException {
		OverridenViewManager newManager = new OverridenViewManager(
				currentManager);
		Properties properties = new Properties();
		properties.load(resource);
		logger.debug("loading view: " + properties.toString());
		for (Object key : properties.keySet()) {
			newManager.overrideView(key.toString(), properties.get(key)
					.toString());
		}
		return newManager;
	}

}