jarobservercontainer.java

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package ranab.jar;

import java.util.*;
import java.util.zip.*;

/**
 * This class contains <code>JarObserver</code> objects. This
 * class is itself a <code>JarObserver</code> class. 
 * 
 * @author <a href="mailto:[e-mail]">Rana Bhattacharyya</a>
 */
public
class JarObserverContainer extends Vector implements JarObserver {
    
   /**
    * default constructor
    */
    public JarObserverContainer()  {
    }
    
    /**
     * add observer
     */
    public void addObserver(JarObserver observer)  {
        if (!contains(observer))  {
            add(observer);
        }
    } 
    
    /**
     * remove observer
     */
    public void removeObserver(JarObserver observer)  {
        if (contains(observer))  {
            remove(observer);
        }
    }
    
    /**
     * start observing
     */
    public void start()  {
        for(int i=0; i<size(); i++)  {
            JarObserver obsr = (JarObserver)elementAt(i);
            obsr.start();
        }
    }
    
    /**
     * set count
     */
    public void setCount(int count) {
        for(int i=0; i<size(); i++)  {
            JarObserver obsr = (JarObserver)elementAt(i);
            obsr.setCount(count);
        }
    }
    
    /**
     * set next entry
     */
    public void setNext(ZipEntry je) {
        for(int i=0; i<size(); i++)  {
            JarObserver obsr = (JarObserver)elementAt(i);
            obsr.setNext(je);
        }
    }
    
    /**
     * set error message
     */
    public void setError(String errMsg) {
        for(int i=0; i<size(); i++)  {
            JarObserver obsr = (JarObserver)elementAt(i);
            obsr.setError(errMsg);
        }
    }
    
    /**
     * stop observing
     */
    public void end() {
        for(int i=0; i<size(); i++)  {
            JarObserver obsr = (JarObserver)elementAt(i);
            obsr.end();
        }
    }
}