[8780cbec] | 1 | package edu.stanford.rt.credential; |
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| 2 | |
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| 3 | import java.util.*; |
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| 4 | |
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| 5 | /** |
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| 6 | * @author Ninghui Li, Sandra Qiu<br> |
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| 7 | * |
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| 8 | * Implementation of <code>IntersectionContainment</code> element. |
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| 9 | * |
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| 10 | */ |
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| 11 | public class RoleIntersection implements PrincipalExpression |
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| 12 | { |
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| 13 | /** |
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| 14 | * list of members in this intersection. |
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| 15 | */ |
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| 16 | private ArrayList parts; // required element. |
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| 17 | |
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| 18 | /** |
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| 19 | * Constuctor for an empty RoleIntersection. |
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| 20 | */ |
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| 21 | public RoleIntersection() |
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| 22 | { |
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| 23 | parts = new ArrayList(); |
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| 24 | } |
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| 25 | |
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| 26 | /** |
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| 27 | * Constructor for RoleIntersection |
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| 28 | */ |
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| 29 | public RoleIntersection(List p) |
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| 30 | { |
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| 31 | if (p == null || p.size() == 0) |
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| 32 | throw new IllegalArgumentException("RoleIntersection: empty parts."); |
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| 33 | // copy over |
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| 34 | parts = new ArrayList(); |
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| 35 | Iterator it = p.iterator(); |
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| 36 | while (it.hasNext()) |
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| 37 | { |
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| 38 | Object pr = it.next(); |
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| 39 | if (!(pr instanceof RoleTerm) && !(pr instanceof Role)) |
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| 40 | throw new IllegalArgumentException("RoleIntersection: wrong element type"); |
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| 41 | parts.add(pr); |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | /** |
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| 46 | * Method getParts. |
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| 47 | * returns an unmodifiable view of the members. |
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| 48 | * @return List |
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| 49 | */ |
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| 50 | public List getParts() |
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| 51 | { |
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| 52 | return Collections.unmodifiableList(parts); |
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| 53 | } |
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| 54 | |
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| 55 | /** |
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| 56 | * Method and. |
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| 57 | * AND operation. |
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| 58 | * @param part |
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| 59 | * @throws CredException |
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| 60 | */ |
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| 61 | public void and(Object part) throws CredException |
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| 62 | { |
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| 63 | if (!(part instanceof RoleTerm) && !(part instanceof Role)) |
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| 64 | throw new CredException("Illegal part type"); |
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| 65 | |
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| 66 | // add this new part to the set. |
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| 67 | if (!parts.contains(part)) |
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| 68 | parts.add(part); |
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| 69 | |
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| 70 | } |
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| 71 | |
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| 72 | /* (non-Javadoc) |
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| 73 | * @see edu.stanford.rt.credential.PrincipalExpression#toString(String) |
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| 74 | */ |
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| 75 | public String toString(String indent) |
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| 76 | { |
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| 77 | String thisIndent = indent + " "; |
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| 78 | StringBuffer sb = new StringBuffer(); |
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| 79 | sb.append(thisIndent).append("Role Intersection: \n"); |
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| 80 | for (int i = 0; i < parts.size(); i++) |
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| 81 | { |
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| 82 | if ((parts.get(i)) instanceof Role) |
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| 83 | { |
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| 84 | sb.append( |
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| 85 | ((Role) parts.get(i)).toString( |
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| 86 | thisIndent + " ")); |
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| 87 | } |
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| 88 | else if ((parts.get(i)) instanceof RoleTerm) |
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| 89 | { |
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| 90 | sb.append( |
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| 91 | ((RoleTerm) parts.get(i)).toString( |
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| 92 | thisIndent + " ")); |
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| 93 | } |
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| 94 | sb.append("\n"); |
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| 95 | } |
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| 96 | return sb.toString(); |
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| 97 | } |
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| 98 | |
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| 99 | } |
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