source: fedd/abac-src/rtml/src/edu/stanford/rt/credential/Role.java @ af51a97

package edu.stanford.rt.credential;
/**
 * @author Ninghui Li, Sandra Qiu<br>
 * 
 * Implementation of <code>Role</code> object in RTML.
 * A role consists of 2 parts: a principal and a role term. 
 */
public class Role implements PrincipalExpression
{
        private Principal principal; // required element.
        private RoleTerm roleTerm; // required element.
        /**
         * Constructor for Role.
         */
        public Role(Principal principal, RoleTerm roleTerm)
        {
                this.principal = principal;
                this.roleTerm = roleTerm;
        }
        /* (non-Javadoc)
         * @see java.lang.Object#hashCode()
         */
        public int hashCode()
        {
                return getPrincipal().hashCode() * 2 + getName().hashCode();
        }
        /**
         * Two roles are equal if both their principals are equal and 
         * the role names are equal.
         * 
         */
        public boolean equals(Object o)
        {
                return (o instanceof Role)
                        && getPrincipal().equals(((Role) o).getPrincipal())
                        && getName().equals(((Role) o).getName());
        }
        /**
         * Returns the principal.
         * @return Principal
         */
        public Principal getPrincipal()
        {
                return principal;
        }
        /**
         * Returns the roleTerm.
         * @return RoleTerm
         */
        public RoleTerm getRoleTerm()
        {
                return roleTerm;
        }
        /**
         * Method getRoleDeclaration.
         * @return RoleDeclaration
         *              The corresponding role declaration.
         */
        public RoleDeclaration getRoleDeclaration()
        {
                return roleTerm.getRoleDeclaration();
        }
        /**
         * Method getName.
         * @return String
         *              The role name.
         */
        public String getName()
        {
                return roleTerm.getRoleDeclaration().getName();
        }
        /* (non-Javadoc)
         * @see edu.stanford.rt.credential.PrincipalExpression#toString(String)
         */
        public String toString(String indent)
        {
                String thisIndent = indent + "  ";

                StringBuffer sb = new StringBuffer();
                sb.append(thisIndent).append("Role: \n");
                if (principal != null)
                        sb.append(principal.toString(thisIndent + "  ")).append(
                                "\n");
                sb.append(roleTerm.toString(thisIndent + "  ")).append("\n");
                return sb.toString();
        }
}