package com.bjsxt.oa.model;

/**
 * 訪問控制列表
 * @author Administrator
 * @hibernate.class table="T_ACL"
 */
public class ACL {
	
	/**
	 * 主體類型：角色
	 */
	public static final String TYPE_ROLE = "Role";
	
	/**
	 * 主體類型：用戶
	 */
	public static final String TYPE_USER = "User";
	
	/**
	 * 授權允許
	 */
	public static final int ACL_YES = 1;
	
	/**
	 * 授權不允許
	 */
	public static final int ACL_NO = 0;
	
	/**
	 * 授權不確定
	 */
	public static final int ACL_NEUTRAL = -1;
	
	/**
	 * @hibernate.id
	 * 		generator-class="native"
	 */
	private int id;
	
	/**
	 * 主體類型：角色或用戶
	 * @hibernate.property
	 * 		not-null="true"
	 */
	private String principalType;
	
	/**
	 * 主體標識：角色標識或用戶標識
	 * @hibernate.property
	 * 		not-null="true"
	 */
	private int principalSn;
	
	/**
	 * 資源標識
	 * @hibernate.property
	 * 		not-null="true"
	 */
	private int resourceSn;
	
	/**
	 * 授權狀態，用其后四位（bit）來表示CRUD操作
	 * @hibernate.property
	 * 		not-null="true"
	 */
	private int aclState;
	
	/**
	 * 表示是否繼承，0表示不繼承，-1表示表示繼承
	 * @hibernate.property
	 * 		not-null="true"
	 */
	private int aclTriState;

	public int getAclState() {
		return aclState;
	}

	public void setAclState(int aclState) {
		this.aclState = aclState;
	}

	public int getAclTriState() {
		return aclTriState;
	}

	public void setAclTriState(int aclTriState) {
		this.aclTriState = aclTriState;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public int getPrincipalSn() {
		return principalSn;
	}

	public void setPrincipalSn(int principalSn) {
		this.principalSn = principalSn;
	}

	public String getPrincipalType() {
		return principalType;
	}

	public void setPrincipalType(String principalType) {
		this.principalType = principalType;
	}

	public int getResourceSn() {
		return resourceSn;
	}

	public void setResourceSn(int resourceSn) {
		this.resourceSn = resourceSn;
	}
	
	/**
	 * acl實例跟主體和資源關聯
	 * 針對此實例進行授權：某種操作是否允許
	 * @param permission 只可以取值0,1,2,3
	 * @param yes true表示允許，false表示不允許
	 */
	public void setPermission(int permission,boolean yes){
		int tmp = 1;
		tmp = tmp << permission;
		if(yes){
			aclState |= tmp;
		}else{
			aclState &= ~tmp;
		}
	}
	
	/**
	 * 獲得ACL授權
	 * @param permission C/R/U/D權限
	 * @return 授權標識：允許/不允許/不確定
	 */
	public int getPermission(int permission){
		
		//如果繼承，則返回未定的授權信息
		if(aclTriState == 0xFFFFFFFF){
			return ACL_NEUTRAL;
		}
		
		int tmp = 1;
		
		tmp = tmp << permission;
		
		tmp &= aclState;
		
		if(tmp != 0){
			return ACL_YES;
		}
		
		return ACL_NO;
	}
	
	/**
	 * 設置本授權是否是繼承的
	 * @param yes true表示繼承，false表示不繼承
	 */
	public void setExtends(boolean yes){
		if(yes){
			aclTriState = 0xFFFFFFFF;
		}else{
			aclTriState = 0;
		}
	}
}