package openminer.data;
import java.util.*;

public class Attribute {
	/** 数值类型 */
	public static final int NUMBERIC_TYPE = 1;
	/** 字符串类型 */
	public static final int STRING_TYPE = 2;
	/** 布尔类型 */
	public static final int BOOLEAN_TYPE = 3;
	/** 离散枚举类型 */
	public static final int ENUM_TYPE = 4;
	/** 错误的类型 */
	public static final int ERROR_TYPE = -1;

	/** 属性的类型 */
	private int m_Type = 0;
	/** 属性的名字 */
	private String m_Name = "";
	/** 属性值域 */
	private Object[] m_ValueField = null;
	
	public Attribute() {
		
	}
	
	public Attribute(int type,String name)  {
		setType(type);
		m_Name = name;
	}
	
	public void setType(int type){
		m_Type = type;
	}
	
	public int getType() {
		return m_Type;
	}
	
	public void setName(String name) {
		m_Name = name;
	}
	
	public String getName() {
		return m_Name;
	}
	
	/**
	 * 是否是离散的属性
	 * @return
	 */
	public boolean isEnumerable() {
		if(m_ValueField == null)
			return false;
		else
			return true;
	}
	
	/**
	 * 设置值域
	 * @param valueSet 值域
	 */
	public void setValueField(List valueSet) {
		m_ValueField = new Object[valueSet.size()];
		Object value = null;
		for(int i=0;i<valueSet.size(); i++) {
			value = valueSet.get(i);
			m_ValueField[i] = value;
		}
	}
	
	/**
	 * 设置值域
	 * @param valueSet 值域
	 */
	public void setValueField(Object[] valueSet) {
		m_ValueField = new Object[valueSet.length];
		for(int i=0;i<valueSet.length; i++) {
			m_ValueField[i] = valueSet[i];
		}
	}
	
	/**
	 * 设置值域
	 * @param valueSet
	 */
	public void setValueField(Hashtable valueSet) {
		int i=0;
		m_ValueField = new Object[valueSet.size()];
		Enumeration hashEnum = valueSet.elements();
		while(hashEnum.hasMoreElements()) {
			m_ValueField[i++] = hashEnum.nextElement();
		}
	}
	
	/**
	 * 获取属性值域
	 * @return 
	 */
	public Object[] getValueField() {
		return m_ValueField;
	}
	
	/**
	 * 获取属性值域元素个数
	 * @return
	 */
	public int getValueFieldSize() {
		return m_ValueField.length;
	}
	
	/**
	 * 获取一个属性值域元素
	 * @param index 索引
	 * @return
	 */
	public Object getValueFieldElement(int index) {
		return m_ValueField[index];
	}
	
	/**
	 * 获取一个值在值域内的索引
	 * @param value 值
	 * @return 索引
	 */
	public int findValueIndex(Object value) {
		for(int i=0;i<m_ValueField.length;i++) {
			if(value.equals(m_ValueField[i])) {
				return i;
			}
		}
		return -1;
	}
	
	/**
	 * 复制一个新的属性对象
	 * @return
	 */
	public Attribute copyNew() {
		Attribute newAtt = new Attribute();
		newAtt.m_Name = m_Name;
		newAtt.m_Type = m_Type;
		if(m_ValueField != null) {
			newAtt.m_ValueField = new Object[m_ValueField.length];
			for(int i=0;i< m_ValueField.length; i++) {
				Object element = m_ValueField[i];
				newAtt.m_ValueField[i] = element;
			}
		}
		else
			newAtt.m_ValueField = null;
		return newAtt;
	}
}