Source Code Cross Referenced for JMLValueToValueRelationEnumerator.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: JMLValueToValueRelationEnumerator.java 1.2 Mon, 09 May 2005 15:27:50 +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:        /** Enumerator for pairs of keys of type {@link JMLType} to
026:         * values of type {@link JMLType} that form the associations in a
027:         * relation.
028:         *
029:         * @version $Revision: 1.2 $
030:         * @author Gary T. Leavens
031:         * @see JMLEnumeration
032:         * @see JMLValueType
033:         * @see JMLValueToValueRelationImageEnumerator
034:         * @see JMLValueToValueRelation
035:         * @see JMLValueToValueMap
036:         * @see JMLEnumerationToIterator
037:         * @see JMLValueSet
038:         */
039:        //-@ immutable
040:        public class JMLValueToValueRelationEnumerator implements 
041:                JMLEnumeration, JMLValueType {
042:
043:            //@ public model JMLValueSet uniteratedPairs;      in objectState;
044:
045:            /** An enumerator for the image pairs in this relation.
046:             */
047:            protected/*@ non_null @*/
048:            JMLValueToValueRelationImageEnumerator imagePairEnum;
049:            //@                                                in uniteratedPairs;
050:
051:            /** The current key for pairs being enumerated.
052:             */
053:            protected JMLType key;
054:            //@                     in uniteratedPairs;
055:
056:            /** An enumerator for the range elements that are related to the
057:             *  key that have not yet been returned.
058:             */
059:            protected/*@ non_null @*/JMLValueSetEnumerator imageEnum;
060:
061:            //@                                                   in uniteratedPairs;
062:
063:            /*@ protected represents uniteratedPairs <- abstractValue();
064:              @*/
065:
066:            /*@ protected invariant moreElements
067:              @             <==> imageEnum.moreElements|| imagePairEnum.moreElements;
068:              @*/
069:
070:            /*@ protected invariant moreElements ==> key != null;
071:              @*/
072:
073:            //@ public invariant elementType == \type(JMLValueValuePair);
074:            //@ public invariant !returnsNull;
075:            /** Initialize this with the given relation.
076:             */
077:            /*@ normal_behavior
078:              @   requires rel != null;
079:              @   assignable uniteratedPairs;
080:              @   assignable moreElements, elementType, returnsNull, owner;
081:              @   ensures uniteratedPairs.equals(rel.theRelation);
082:              @    ensures owner == null;
083:              @*/
084:            JMLValueToValueRelationEnumerator(/*@ non_null @*/
085:            JMLValueToValueRelation rel) {
086:                imagePairEnum = rel.imagePairs();
087:                if (imagePairEnum.hasMoreElements()) {
088:                    JMLValueValuePair p = imagePairEnum.nextImagePair();
089:                    key = p.key;
090:                    imageEnum = ((JMLValueSet) p.value).elements();
091:                } else {
092:                    key = null;
093:                    imageEnum = (new JMLValueSet()).elements();
094:                }
095:            }
096:
097:            //@ requires ipEnum != null;
098:            //@ requires iEnum != null;
099:            //@ requires (ipEnum.moreElements || iEnum.moreElements) ==> k != null;
100:            protected JMLValueToValueRelationEnumerator(
101:                    JMLValueToValueRelationImageEnumerator ipEnum,
102:                    JMLValueSetEnumerator iEnum, JMLType k) {
103:                imagePairEnum = (JMLValueToValueRelationImageEnumerator) ipEnum
104:                        .clone();
105:                imageEnum = (JMLValueSetEnumerator) iEnum.clone();
106:                key = k;
107:            }
108:
109:            /** Tells whether this enumerator has more uniterated elements.
110:             *  @see #nextElement
111:             *  @see #nextPair
112:             */
113:            /*@ also
114:              @  public normal_behavior
115:              @    assignable \nothing;
116:              @    ensures \result == !uniteratedPairs.isEmpty();
117:              @*/
118:            public/*@ pure @*/boolean hasMoreElements() {
119:                return (imagePairEnum.hasMoreElements() || imageEnum
120:                        .hasMoreElements());
121:            }
122:
123:            /** Return the next image pair in this, if there is one.
124:             *  @exception JMLNoSuchElementException when this is empty.
125:             *  @see #hasMoreElements
126:             *  @see #nextPair
127:             */
128:            /*@ also
129:              @  public normal_behavior
130:              @    requires !uniteratedPairs.isEmpty();
131:              @    assignable uniteratedPairs;
132:              @    ensures \old(uniteratedPairs).has((JMLType)\result)
133:              @         && uniteratedPairs.
134:              @                equals(\old(uniteratedPairs).remove((JMLType)\result));
135:              @ also
136:              @  public exceptional_behavior
137:              @    requires uniteratedPairs.isEmpty();
138:              @    assignable \nothing;
139:              @    signals (JMLNoSuchElementException);
140:              @*/
141:            public Object nextElement() throws JMLNoSuchElementException {
142:                if (imageEnum.hasMoreElements()) {
143:                    Object v = imageEnum.nextElement();
144:                    return new JMLValueValuePair(key, (JMLType) v);
145:                } else if (imagePairEnum.hasMoreElements()) {
146:                    Object p = imagePairEnum.nextElement();
147:                    JMLValueValuePair imagePair = (JMLValueValuePair) p;
148:                    key = imagePair.key;
149:                    imageEnum = ((JMLValueSet) imagePair.value).elements();
150:                    Object v = imageEnum.nextElement();
151:                    return new JMLValueValuePair(key, (JMLType) v);
152:                } else {
153:                    throw new JMLNoSuchElementException();
154:                }
155:            }
156:
157:            /** Return the next pair in this, if there is one.
158:             *  @exception JMLNoSuchElementException when this is empty.
159:             *  @see #hasMoreElements
160:             *  @see #nextElement
161:             */
162:            /*@ public normal_behavior
163:              @    requires !uniteratedPairs.isEmpty();
164:              @    assignable uniteratedPairs, moreElements;
165:              @    ensures \old(uniteratedPairs).has(\result)
166:              @         && uniteratedPairs
167:              @            .equals(\old(uniteratedPairs).remove(\result));
168:              @ also
169:              @  public exceptional_behavior
170:              @    requires uniteratedPairs.isEmpty();
171:              @    assignable \nothing;
172:              @    signals (JMLNoSuchElementException);
173:              @
174:              @ also
175:              @   modifies uniteratedPairs;
176:              @   modifies moreElements;
177:              @   ensures \old(moreElements);
178:              @   signals (JMLNoSuchElementException) \old(!moreElements);
179:              @*/
180:            public/*@ non_null @*/JMLValueValuePair nextPair()
181:                    throws JMLNoSuchElementException {
182:                Object p = nextElement();
183:                JMLValueValuePair aPair = (JMLValueValuePair) p;
184:                return aPair;
185:            }
186:
187:            /** Return a clone of this enumerator.
188:             */
189:            public Object clone() {
190:                return new JMLValueToValueRelationEnumerator(imagePairEnum,
191:                        imageEnum, key);
192:            }
193:
194:            /** Return true just when this enumerator has the same state as
195:             *  the given argument.
196:             */
197:            public/*@ pure @*/boolean equals(Object oth) {
198:                if (oth == null
199:                        || !(oth instanceof  JMLValueToValueRelationEnumerator)) {
200:                    return false;
201:                } else {
202:                    JMLValueToValueRelationEnumerator js = (JMLValueToValueRelationEnumerator) oth;
203:                    return abstractValue().equals(js.abstractValue());
204:                }
205:            }
206:
207:            /** Return a hash code for this enumerator.
208:             */
209:            public/*@ pure @*/int hashCode() {
210:                return abstractValue().hashCode();
211:            }
212:
213:            /** Return the set of uniterated pairs from this enumerator.
214:             */
215:            protected/*@ spec_public pure @*//*@ non_null @*/
216:            JMLValueSet abstractValue() {
217:                JMLValueSet ret = new JMLValueSet();
218:                JMLValueToValueRelationEnumerator enum2 = (JMLValueToValueRelationEnumerator) clone();
219:                while (enum2.hasMoreElements()) {
220:                    JMLValueValuePair aPair = enum2.nextPair();
221:                    ret = ret.insert(aPair);
222:                }
223:                return ret;
224:            }
225:        }
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