Screen.java

package ca.ubc.cs.spl.aspectPatterns.examples.bridge.java;

/* -*- Mode: Java; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
 *
 * This file is part of the design patterns project at UBC
 *
 * The contents of this file are subject to the Mozilla Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * either http://www.mozilla.org/MPL/ or http://aspectj.org/MPL/.
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is ca.ubc.cs.spl.aspectPatterns.
 * 
 * For more details and the latest version of this code, please see:
 * http://www.cs.ubc.ca/labs/spl/projects/aodps.html
 *
 * Contributor(s):   
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/**
 * Represents the <i>Abstraction</i> in the scenario. <code>Screen</code>
 * provides two methods to draw/print: <code>drawText(String)</code> and
 * <code>drawTextBox(String)</code>. Both methods call appropriate methods
 * on the <code>ScreenImplementor</code> of this <code>Screen</code> object.
 * 
 * Note that cannot be an interface, since it has implementation 
 * associated with it (otherwise it would require multiple inheritance). 
 * This restricts the flexibility of the patter somewhat as all 
 * <i>RefinedAbstractions</i> consequently can not have additional 
 * superclasses.
 *
 * @author  Jan Hannemann
 * @author  Gregor Kiczales
 * @version 1.1, 01/26/04
 *
 */

public abstract class Screen {
    
    /**
     * stores the actual <i>Implementor</i> to use 
     */

    private ScreenImplementation implementor;  
    
    /**
     * Creates a new <code>Screen</code> object given an <i>Implementor</i>
     *
     * @param implementor the implementor to use for calls to 
     * <i>operationImpl()</i>
     */
    
    public Screen(ScreenImplementation implementor) {
        this.implementor = implementor;
    }
    
    /**
     * Draws or prints a text to an output device determined by the 
     * current <i>Implementor</i>.
     *
     * @param text The text to be drawn/printed
     */
    
    public void drawText(String text) {
        implementor.printText(text);
        implementor.printLine();
    }
    
    /**
     * Draws or prints a text in a box to an output device determined 
     * by the current <i>Implementor</i>.
     *
     * @param text The text to be drawn/printed
     */
    
    public void drawTextBox(String text) {

        int length = text.length();

        for(int i=0; i<length+4; i++) {
            implementor.printDecor();
        }

        implementor.printLine();
        implementor.printDecor();
        implementor.printText(" "+text+" ");
        implementor.printDecor();
        implementor.printLine();
        
        for(int i=0; i<length+4; i++) {
            implementor.printDecor();
        }

        implementor.printLine(); 
    }
}