nginclude.java

来自「Novocode的 SWT 控件框架 丰富了MDI功能」· Java 代码 · 共 66 行

/*******************************************************************************
 * Copyright (c) 2004 Stefan Zeiger and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.novocode.com/legal/epl-v10.html
 * 
 * Contributors:
 *     Stefan Zeiger ([e-mail]) - initial API and implementation
 *******************************************************************************/

package com.novocode.naf.resource;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.*;

import com.novocode.naf.app.*;
import com.novocode.naf.data.XMLProperty;


/**
 * A component that includes another component into the current list.
 * 
 * @author Stefan Zeiger ([e-mail])
 * @since Nov 25, 2003
 */

public class NGInclude extends NGComponent
{
  private String ref;
  private URL refURL;


  @XMLProperty("ref")
  public void setReference(String s)
  {
    try
    {
      refURL = new URL(getResourceURL(), s);
      ref = s;
    }
    catch(MalformedURLException ex)
    {
      throw new NAFException("Error creating URL object for reference \""+s+"\"", ex);
    }
  }

  public String getReference() { return ref; }

  
  protected void init() throws NAFException
  {
    super.init();
    if(ref == null) throw new NAFException("An include element must have a ref attribute");
  }


  public void expandSelf(List<NGComponent> l) throws NAFException
  {
    NGComponent res = resourceManager.getResource(refURL);
    if(res == null) throw new NAFException("Error resolving reference \""+ref+"\"");
    res.expandSelf(l);
  }
}