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

package edu.stanford.rt.credential;
/**
 * @author Ninghui Li, Sandra Qiu<br>
 *
 * Implementation of role definition in RTML, which is represented by 
 * <code>Definition</code> group element.
 * 
 * A role definition has a head and a body.
 */
public class RoleDefinition
{
        /**
         * Role head.
         */
        private Role head; // always a local role
        /**
         * Role body.
         */
        private PrincipalExpression body;
        /**
         * role definition context
         */
        private CredentialDomain context;

        /**
         * Constructor for RoleDefinition.
         */
        public RoleDefinition(
                CredentialDomain context,
                Role head,
                PrincipalExpression body)
        {
                this.context = context;
                this.head = head;
                this.body = body;
        }
        /**
         * Returns the body.
         * @return PrincipalExpression
         */
        public PrincipalExpression getBody()
        {
                return body;
        }
        /**
         * Returns the head.
         * @return Role
         */
        public Role getHead()
        {
                return head;
        }

        /**
         * Method getContext.
         * @return CredentialDomain
         */
        public CredentialDomain getContext() throws DomainSpecException
        {
                if (!context.isComplete())
                        throw new DomainSpecException("Incomplete CredentialDomain");
                return context;
        }

        /**
         * Method toString.
         * @param indent
         * @return String
         */
        public String toString(String indent)
        {
                String thisIndent = indent + "  ";
                StringBuffer sb = new StringBuffer();
                sb.append(thisIndent).append("Role Definition: \n");
                sb.append(thisIndent + "  ").append("Head: \n");
                sb.append(head.toString(thisIndent + "  ")).append("\n");
                sb.append(thisIndent + "  ").append("Body: \n");
                sb.append(body.toString(thisIndent + "  ")).append("\n");
                return sb.toString();
        }

}