Source Code Cross Referenced for JMLEqualsObjectPair.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: JMLEqualsObjectPair.java 1.2 Mon, 09 May 2005 15:27:50 +0200 engelc $
002:
003:        // Copyright (C) 1998, 1999 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:        /** Pairs of {@link Object} and {@link Object}, used in the types
024:         * {@link JMLEqualsToObjectRelation} and {@link JMLEqualsToObjectMap}.
025:         *
026:         * <p> In a pair the first element is called the "key" and the second
027:         * the "value". Both the key and the value in a pair must be non-null.
028:         *
029:         * @version $Revision: 1.2 $
030:         * @author Gary T. Leavens
031:         * @author Clyde Ruby
032:         * @see JMLEqualsToObjectRelation
033:         * @see JMLEqualsToObjectMap
034:         */
035:        //-@ immutable
036:        public/*@ pure @*/class JMLEqualsObjectPair implements  JMLType {
037:
038:            /** The key of this pair.
039:             */
040:            public final/*@ non_null @*/Object key;
041:
042:            /** The value of this pair.
043:             */
044:            public final/*@ non_null @*/Object value;
045:
046:            //@ public invariant owner == null;
047:
048:            /*@  public model_program {
049:              @    assume dv != null && rv != null;
050:              @    set owner = null;
051:              @    key = dv;
052:              @    value = rv;
053:              @  }
054:              @ also
055:              @    ensures dv != null && rv != null;
056:              @    signals (NullPointerException) dv == null || rv == null;
057:              @*/
058:            /** Initialize the key and value of this pair.
059:             */
060:            public JMLEqualsObjectPair(/*@ non_null @*/Object dv,
061:            /*@ non_null @*/Object rv) throws NullPointerException {
062:                if (dv == null) {
063:                    throw new NullPointerException("Attempt to create a"
064:                            + " JMLEqualsObjectPair with null" + " key");
065:                }
066:                if (rv == null) {
067:                    throw new NullPointerException("Attempt to create a"
068:                            + " JMLEqualsObjectPair with null" + " value");
069:                }
070:                key = dv;
071:                value = rv;
072:            }
073:
074:            // inherit javadoc comment
075:            /*@ also
076:              @  public model_program {
077:              @    return new JMLEqualsObjectPair(key, value);
078:              @  }
079:              @*/
080:            public Object clone() {
081:                return new JMLEqualsObjectPair(key, value);
082:            }
083:
084:            /** Tell whether this object's key is equal to the given key.
085:             * @see #equals
086:             */
087:            /*@  public normal_behavior
088:              @    ensures \result == (key.equals(dv));
089:              @*/
090:            public boolean keyEquals(Object dv) {
091:                return key.equals(dv);
092:            }
093:
094:            /** Tell whether this object's key is equal to the given key.
095:             * @see #equals
096:             */
097:            /*@  public normal_behavior
098:              @    ensures \result == (value == rv);
099:              @*/
100:            public boolean valueEquals(Object rv) {
101:                return value == rv;
102:            }
103:
104:            /** Test whether this object's value is equal to the given argument.
105:             * @see #keyEquals
106:             */
107:            /*@ also
108:              @  public normal_behavior
109:              @    requires obj != null && obj instanceof JMLEqualsObjectPair;
110:              @    ensures \result == 
111:              @            ( ((JMLEqualsObjectPair)obj).key.equals(key) 
112:              @              && ((JMLEqualsObjectPair)obj).value == value );
113:              @ also 
114:              @  public normal_behavior
115:              @    requires obj == null || !(obj instanceof JMLEqualsObjectPair);
116:              @    ensures !\result;
117:              @*/
118:            public boolean equals(Object obj) {
119:                if (obj != null && obj instanceof  JMLEqualsObjectPair) {
120:                    JMLEqualsObjectPair pair = (JMLEqualsObjectPair) obj;
121:                    return pair.key.equals(key) && pair.value == value;
122:                } else {
123:                    return false;
124:                }
125:            }
126:
127:            /** Return a hash code for this object.
128:             */
129:            public int hashCode() {
130:                return key.hashCode() + value.hashCode();
131:            }
132:
133:            /** Return a string representation of this object.
134:             */
135:            public String toString() {
136:                return (new String("(") + key + new String(", ") + value + new String(
137:                        ")"));
138:            }
139:        };
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