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package com.sun.enterprise.security;

import java.security.Permission;

/**
 * This class is 
 * @author Ron Monzillo
 */

public class CachedPermissionImpl extends Object implements CachedPermission {

    PermissionCache permissionCache;
    Permission permission;
    boolean granted;
    Epoch epoch;

    public CachedPermissionImpl(PermissionCache c, Permission p) {
	this.permissionCache = c;
	this.permission = p;
	epoch = new Epoch();
    }

    public Permission getPermission() {
	return this.permission;
    }

    public PermissionCache getPermissionCache() {
	return this.permissionCache;
    }

    //synchronization done in PermissionCache
    public boolean checkPermission() {
	boolean granted = false;
	if (permissionCache != null) {
	    granted = permissionCache.checkPermission(this.permission,this.epoch);
	}
	return granted;
    }

    // used to hold last result obtained from cache and cache epoch.
    // epoch is used by PermissionCache to determine when result is out of date.
    class Epoch {

	int epoch;
	boolean granted;

	Epoch() {
	    this.epoch = 0;
	    this.granted = false;
	}
    }

}