package foundation.data.entity;

import java.util.HashMap;
import java.util.Map;

import foundation.data.meta.field.FieldsRuntime;


public class Index implements IIndex {
	
	private String fieldName;
	private Map<Object, Entity> maps;

	
	public Index(String fieldName) {
		maps = new HashMap<Object, Entity>();
		
		this.fieldName = fieldName;
	}

	public void load(EntitySet entitySet) {
		FieldsRuntime meta = entitySet.getEntityMeta();
		int index = meta.getIndex(fieldName);
		
		for (Entity entity: entitySet) {
			Object value = entity.getValue(index);
			
			if (value == null) {
				continue;
			}
			
			maps.put(value, entity);
		}
	}
	
	public void add(Object value, Entity entity) {
		if (value == null) {
			return;
		}
		
		maps.put(value, entity);
	}
	
	public Entity get(Object value) {
		if (value == null) {
			return null;
		}
		
		return maps.get(value);
	}

	public String getName() {
		return fieldName;
	}
}