/**
 * An abstract class which can get content from a file or a HTTP URL 
 * or other resource 
 */
public abstract class AbstractRead {
 protected String resource;
 public void getContent() { // Template Method
 if(open()) {
 readContent();
 close();
 }
 }
 public void setResource(String s) {
 resource = s;
 }
 protected abstract boolean open();
 protected abstract void readContent();
 protected abstract void close();
}