利用掩码进行权限管理代码,Java代码库,德仔网

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【Java】利用掩码进行权限管理

作者:瑞祺 / 发布于2014/10/14/ 226


	public class TestMask {
	 public static void main(String[] args) {
	 FileManager fm = new FileManager();
	
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	
	 fm.setCanRead(true);
	 System.out.println("can read....");
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	
	 fm.setCanWrite(true);
	 System.out.println("can read write....");
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	
	 fm.setCanRemove(true);
	 System.out.println("can read write remove....");
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	
	 fm.setCanRemove(false);
	 System.out.println("can read write....");
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	
	 fm.setCanWrite(false);
	 System.out.println("can read....");
	 System.out.println("read : " + fm.canRead());
	 System.out.println("write : " + fm.canWrite());
	 System.out.println("remove : " + fm.canRemove());
	 System.out.println("-----------------");
	 }
	}
	
	class FileManager {
	 private static final int CAN_READ_MASK = 0x00000001;
	 private static final int CAN_WRITE_MASK = 0x00000010;
	 private static final int CAN_REMOVE_MASK = 0x00000100;
	
	 private int mPrivateFlags;
	
	 public void setCanRead(boolean canRead) {
	 if(canRead) {
	 mPrivateFlags |= CAN_READ_MASK;
	 }else {
	 mPrivateFlags &= ~CAN_READ_MASK;
	 // or mPrivateFlags ^= CAN_READ_MASK;
	 }
	 }
	
	 public boolean canRead() {
	 return (mPrivateFlags & CAN_READ_MASK) == CAN_READ_MASK;
	 }
	
	 public void setCanWrite(boolean canWrite) {
	 if(canWrite) {
	 mPrivateFlags |= CAN_WRITE_MASK;
	 }else {
	 mPrivateFlags &= ~CAN_WRITE_MASK;
	 }
	 }
	
	 public boolean canWrite() {
	 return (mPrivateFlags & CAN_WRITE_MASK) == CAN_WRITE_MASK;
	 }
	
	 public void setCanRemove(boolean canRemove) {
	 if(canRemove) {
	 mPrivateFlags |= CAN_REMOVE_MASK;
	 }else {
	 mPrivateFlags &= ~CAN_REMOVE_MASK;
	 }
	 }
	
	 public boolean canRemove() {
	 return (mPrivateFlags & CAN_REMOVE_MASK) == CAN_REMOVE_MASK;
	 }
	}

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