Source Code Cross Referenced for JMLValueSetEnumerator.java in  » Testing » KeY » org » jmlspecs » models » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Testing » KeY » org.jmlspecs.models 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        // @(#)$Id: JMLValueSetEnumerator.java 1.1 Mon, 02 May 2005 14:31:03 +0200 engelc $
002:
003:        // Copyright (C) 1998, 1999, 2002 Iowa State University
004:
005:        // This file is part of JML
006:
007:        // JML is free software; you can redistribute it and/or modify
008:        // it under the terms of the GNU General Public License as published by
009:        // the Free Software Foundation; either version 2, or (at your option)
010:        // any later version.
011:
012:        // JML is distributed in the hope that it will be useful,
013:        // but WITHOUT ANY WARRANTY; without even the implied warranty of
014:        // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
015:        // GNU General Public License for more details.
016:
017:        // You should have received a copy of the GNU General Public License
018:        // along with JML; see the file COPYING.  If not, write to
019:        // the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
020:
021:        package org.jmlspecs.models;
022:
023:        import java.util.Enumeration;
024:
025:        /** An enumerator for sets of values.
026:         *
027:         * @version $Revision: 1.1 $
028:         * @author Gary T. Leavens, with help from Albert Baker, Clyde Ruby,
029:         * and others.
030:         * @see JMLEnumeration
031:         * @see JMLValueType
032:         * @see JMLValueSet
033:         * @see JMLEnumerationToIterator
034:         */
035:        //-@ immutable
036:        public class JMLValueSetEnumerator implements  JMLEnumeration,
037:                JMLValueType {
038:
039:            /** The elements that have not yet been returned by nextElement.
040:             */
041:            //@ public model JMLValueSet uniteratedElems;        in objectState;
042:            //@ public invariant uniteratedElems != null;
043:            /** The list representing the elements that have not yet been
044:             * returned by this enumerator.
045:             */
046:            protected JMLListValueNode currentNode;
047:
048:            //@                               in uniteratedElems;
049:
050:            //@ protected represents uniteratedElems <- new JMLValueSet(currentNode);
051:
052:            //@ protected invariant moreElements <==> currentNode != null;
053:
054:            //@ public invariant elementType <: \type(JMLType);
055:
056:            /*@ public invariant
057:              @       !uniteratedElems.isEmpty()
058:              @        ==> uniteratedElems.elementType <: elementType;
059:              @*/
060:
061:            //@ public constraint returnsNull == \old(returnsNull);
062:            /*@ public invariant
063:              @       !returnsNull
064:              @         ==> uniteratedElems.isEmpty() || !uniteratedElems.containsNull;
065:              @*/
066:
067:            /** Initialize this with the given set.
068:             */
069:            /*@ normal_behavior
070:              @   requires s != null;
071:              @   assignable uniteratedElems;
072:              @   modifies moreElements, elementType, returnsNull, owner;
073:              @   ensures uniteratedElems.equals(s);
074:              @   ensures owner == null;
075:              @   ensures elementType == s.elementType;
076:              @   ensures returnsNull == s.containsNull;
077:              @*/
078:            JMLValueSetEnumerator(/*@ non_null @*/JMLValueSet s) {
079:                //@ set owner = null;
080:                //@ set elementType = s.elementType;
081:                //@ set returnsNull = s.containsNull;
082:                currentNode = s.the_list;
083:            }
084:
085:            /** Tells whether this enumerator has more uniterated elements.
086:             */
087:            /*@ also
088:              @   public normal_behavior
089:              @     ensures \result == !uniteratedElems.isEmpty();
090:              @*/
091:            public/*@ pure @*/boolean hasMoreElements() {
092:                return currentNode != null;
093:            }
094:
095:            /** Return the next element in this, if there is one.
096:             *  @exception JMLNoSuchElementException when this is empty.
097:             */
098:            /*@ also
099:              @   public normal_behavior
100:              @     requires hasMoreElements();
101:              @     assignable uniteratedElems, moreElements;
102:              @     ensures
103:              @        (\result == null
104:              @           ==> \old(uniteratedElems).has(null)
105:              @               && uniteratedElems.equals(\old(uniteratedElems)
106:              @                                      .remove(null)))
107:              @       && (\result != null
108:              @           ==> \old(uniteratedElems).has((JMLType) \result)
109:              @               && uniteratedElems.equals(\old(uniteratedElems)
110:              @                                      .remove((JMLType) \result)));
111:              @ also
112:              @   public exceptional_behavior
113:              @     requires !hasMoreElements();
114:              @     assignable \nothing;
115:              @     signals (JMLNoSuchElementException);
116:              @*/
117:            public Object nextElement() throws JMLNoSuchElementException {
118:                if (currentNode != null) {
119:                    JMLType retValue = currentNode.val;
120:                    //@ assume retValue != null ==> \typeof(retValue) <: elementType;
121:                    //@ assume retValue == null ==> returnsNull;
122:                    currentNode = currentNode.next;
123:                    return retValue;
124:                } else {
125:                    throw new JMLNoSuchElementException(
126:                            "Tried to .nextElement() " + "with JMLValueSet "
127:                                    + "Enumerator `off the end'");
128:                }
129:            }
130:
131:            /** Return a clone of this enumerator.
132:             */
133:            public Object clone() {
134:                return new JMLValueSetEnumerator(new JMLValueSet(currentNode));
135:            } //@ nowarn Post;
136:
137:            /** Return true just when this enumerator has the same state as
138:             * the given argument.
139:             */
140:            public/*@ pure @*/boolean equals(Object oth) {
141:                if (oth == null || !(oth instanceof  JMLValueSetEnumerator)) {
142:                    return false;
143:                } else {
144:                    JMLValueSetEnumerator js = (JMLValueSetEnumerator) oth;
145:                    if (currentNode == null) {
146:                        return js.currentNode == null;
147:                    } else {
148:                        return currentNode.equals(js.currentNode);
149:                    }
150:                }
151:            }
152:
153:            /** Return a hash code for this enumerator.
154:             */
155:            public int hashCode() {
156:                return currentNode == null ? 0 : currentNode.hashCode();
157:            }
158:        }
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