AddTag for DOM Tree

add_tag.java

public void addTag(String word, String tag) {
		recursiveAddTag(root, word, tag);
	}
	
	private void recursiveAddTag(TagNode parent, String word, String tag) {
		for (TagNode ptr=parent; ptr != null;ptr=ptr.sibling) {
			String[] parts = ptr.tag.split(word+"[^\\s\\w]*",2);
			if(parts.length > 1) {
				System.out.println("operating on: " + java.util.Arrays.toString(parts));
				if(ptr.tag.equals(word)) {
					ptr.tag = tag;
					ptr.firstChild = new TagNode(word, null, null);
					return;
				} else if(parts[0].equals("")) {
					ptr.tag = tag;
					ptr.firstChild = new TagNode(word, null, null);
					ptr.sibling = new TagNode(parts[1], null, ptr.sibling);
				} else if(parts[1].equals("")) {
					ptr.tag = parts[0];
					ptr.sibling = new TagNode(tag, new TagNode(word, null, null), ptr.sibling);
				} else {
					ptr.tag = parts[0];
					TagNode next = new TagNode(parts[1], null, ptr.sibling);
					ptr.sibling = new TagNode(tag, new TagNode(word, null, null), next);
				}
				return;
			} else if(ptr.firstChild != null) recursiveAddTag(ptr.firstChild, word, tag);
		}
	}