package com.treelight.krnl;

import java.util.LinkedList;

/**
 * A list of content objects (either text nodes or inline nodes).
 *
 * @version 0.1
 * @author Eric Armstrong
 * @see ../NodesAndLists.html
 */
public abstract class ContentList extends AbstractList {
  static final String type = CONTENT_LIST;

  private LinkedList list = new LinkedList();

  public void add(ContentNode node) 
    list.add(node); 
  }

  public void remove(ContentNode targetNode)
  throws ItemNotFoundException { 
    Iterator lit = list.listIterator();
    while (lit.hasNext()) {
      ContentNode currNode = (ContentNode) lit.next();
      if (currNode.equals(targetNode)) {
        lit.remove();
        return; // successful
      }
    }
    throw new ItemNotFoundException();
  }

  public ContentNode get(int n) { return (ContentNode) list.get(n); }

  public void replace(int n, ContentNode node) { 
    // ___TODO___
  }

  /**
   * Return the list's content.
   */
  public String getContent() {
    String content = "";
    Iterator it = list.iterator();
    while (it.hasNext()) {
      ContentNode node = (ContentNode) it.next();
      content += node.getContent();
    }
    return content;
  }

}//ContentList