package chat.module.friendcircle;

import java.util.HashSet;
import java.util.Set;

import frame.util.ContentBuilder;

public class LabeList {

	public static String Spliter = "#";
	private Set<String> items;
	private String value;
	
	
	public LabeList() {
		items = new HashSet<String>();
		value = null;
	}
	
	public void addone(String label) {
		if (label == null) {
			return;
		}
		
		items.add(label);
		value = null;
	}

	public synchronized String getValue() {
		if (value == null) {
			value = createValue();
		}
		
		return value;
	}

	private String createValue() {
		if (items.isEmpty()) {
			return "";
		}
		
		ContentBuilder builder = new ContentBuilder(Spliter);
		
		for (String label: items) {
			builder.append(label);
		}
		
		return Spliter + builder.toString();
	}

	public void load(String value) {
		if (value == null) {
			return;
		}
		
		value = value.trim();
		
		String[] segments = value.split("#");
		
		for (String segment: segments) {
			segment = segment.trim();
			
			if ("".equals(segment)) {
				continue;
			}
			
			items.add(segment);
		}
	}
}