camera.java

Java source code IP Camera project for studying. Java源代碼的IP攝像頭項目的研究。

package sept.model;

import java.io.File;
import java.util.ArrayList;
import java.awt.*;


/**
 * Class Camera
 * 
 * Camera is a container class that stores photos taken by an IP Camera 
 *
 * @author Goran Mateski
 * @since v1.0
 */
public class Camera {
	private ArrayList<Photo> photos;
	private String name;      /* name of camera */
	private String location; /* Directory of Camera */
	private File   folder;	  /* Pointer to directory */
	private String []fileNames; /* an array of filenames for the photos */


	
	/**
	 * Constructor
	 * 
	 * Builds a camera Object
	 * @throws Exception 
	 */
	public Camera (String cameraName, String location) throws Exception{
		this.name = cameraName;
		this.photos = new ArrayList<Photo>();
		
		/* File pointer points to the directory */
		folder = new File(location);
		
		/* if directory doesn't exist throw an exception. */
		if(folder == null){
			throw new Exception("Directory does not exist");
		}
		
		/* Put the names of files from the folder into an array of strings */
		fileNames = folder.list();
		
		updateImages();
	}
	
	

	
	
	/**
	 * Method UpdateImageList
	 * Retrieves a list of filenames from a directory.
	 * 
	 * @return Returns true if the files have changed since last access. Returns
	 * false if the files have not changed.
	 */
	protected boolean updateImageList(){

		//TODO: Fix this method it is buggy.

		//File update = new File(location);
		//String newFileNames[] = update.list();
		//boolean changes = false;
		
		/* if the number of files in a directory has not changed
		 * check that the filenames have changed. */
/*		if(newFileNames.length == fileNames.length){
			for(int i = 0; i < newFileNames.length; i++){
				if(!fileNames[i].equals(newFileNames[i]) ){
					changes = true;
				}
			}
		}
		else {
			changes = true;
		}
		*/
		
		/* overwrite old list of filenames with new one */
		//fileNames = newFileNames;
		
		/* if any changes have occured, download the images again */
		//if(changes)
			//updateImages();
		
	    updateImages();
		//return changes;
		return true;
	}
	
	
	
	/**
	 * Method updateImages()
	 * 
	 * Downloads the images from a folder. Should only be used when updateImageList()
	 * returns true.
	 * 
	 * I hope the computers at RMIT have plenty of RAM :S
	 */
	private void updateImages(){
		Image image = null;
		Photo p = null;
		
		for(int i = 0; i < this.fileNames.length; i++){			
			try {
				image = Toolkit.getDefaultToolkit().getImage(fileNames[i]);
				p = new Photo(fileNames[i], image);
				photos.add(p);
			}
			catch (Exception e){
				e.printStackTrace();
			}
		}
	}


	

	/**
	 * Method getName
	 * @return Returns the name of the Camera
	 */
	public String getName(){
		return name;
	}
	
	
	
	
	/**
	 * Method getPhotos
	 * 
	 * Accessor method that retrieves all the photos taken by a camera.
	 * @return Returns an ArrayList of Photo objects. (See Photo.java).
	 */
	protected ArrayList<Photo> getPhotos(){
		return photos;
	}

	
	
	
	/**
	 * Method getLocation
	 * @return Returns the directory of the Camera.
	 */
	protected String getLocation(){
		return location;
	}
}