source: fedd/abac-src/rtml/src/edu/stanford/rt/credential/LinkedRole.java @ e794984

package edu.stanford.rt.credential;


/**
 * @author Ninghui Li, Sandra Qiu<br>
 * 
 * Implementation of <code>LinkedRole</code> element.
 */
public class LinkedRole implements PrincipalExpression
{
        private RoleTerm roleTerm1; // required element.
        private RoleTerm roleTerm2; // required element.

    /**
     * Constructor for LinkedRole.
     */
        public LinkedRole(RoleTerm term1, RoleTerm term2)
        {
                roleTerm1 = term1;
                roleTerm2 = term2;
        }

    /**
     * Accessor method for the role terms. 
     */
    public RoleTerm getRoleTermAt(int index) {
        switch(index) {
        case 0: 
            return roleTerm1;
        case 1: 
            return roleTerm2;
        default: 
            return null;
        }
    } 

    /**
         * @see edu.stanford.rt.credential.PrincipalExpression#toString(String)
         */
        public String toString(String indent)
        {
                String thisIndent = indent + "  ";

                StringBuffer sb = new StringBuffer();
                sb.append(thisIndent).append("Linked Role: \n");
                sb
                        .append(thisIndent + "  ")
                        .append(roleTerm1.toString(thisIndent + "  "))
                        .append("\n");
                sb
                        .append(thisIndent + "  ")
                        .append(roleTerm2.toString(thisIndent + "  "))
                        .append("\n");
                return sb.toString();
        }

}