Source Code Cross Referenced for JMLValueEqualsPair.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: JMLValueEqualsPair.java 1.1 Mon, 02 May 2005 14:31:03 +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 JMLType} and {@link Object}, used in the types
024:         * {@link JMLValueToEqualsRelation} and {@link JMLValueToEqualsMap}.
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: 1.1 $
030:         * @author Gary T. Leavens
031:         * @author Clyde Ruby
032:         * @see JMLValueToEqualsRelation
033:         * @see JMLValueToEqualsMap
034:         */
035:        //-@ immutable
036:        public/*@ pure @*/class JMLValueEqualsPair implements  JMLType {
037:
038:            /** The key of this pair.
039:             */
040:            public final/*@ non_null @*/JMLType 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 = (JMLType)dv.clone();
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 JMLValueEqualsPair(/*@ non_null @*/JMLType dv,
061:            /*@ non_null @*/Object rv) throws NullPointerException {
062:                if (dv == null) {
063:                    throw new NullPointerException("Attempt to create a"
064:                            + " JMLValueEqualsPair with null" + " key");
065:                }
066:                if (rv == null) {
067:                    throw new NullPointerException("Attempt to create a"
068:                            + " JMLValueEqualsPair with null" + " value");
069:                }
070:                //@ assume dv != null && rv != null;
071:                //@ set owner = null;
072:                key = (JMLType) dv.clone();
073:                value = rv;
074:            }
075:
076:            // inherit javadoc comment
077:            /*@ also
078:              @  public model_program {
079:              @    return new JMLValueEqualsPair(key, value);
080:              @  }
081:              @*/
082:            public Object clone() {
083:                return new JMLValueEqualsPair(key, value);
084:            } //@ nowarn Post;
085:
086:            /** Tell whether this object's key is equal to the given key.
087:             * @see #equals
088:             */
089:            /*@  public normal_behavior
090:              @    ensures \result == (key.equals(dv));
091:              @*/
092:            public boolean keyEquals(JMLType dv) {
093:                return key.equals(dv);
094:            }
095:
096:            /** Tell whether this object's key is equal to the given key.
097:             * @see #equals
098:             */
099:            /*@  public normal_behavior
100:              @    ensures \result == (value.equals(rv));
101:              @*/
102:            public boolean valueEquals(Object rv) {
103:                return value.equals(rv);
104:            }
105:
106:            /** Test whether this object's value is equal to the given argument.
107:             * @see #keyEquals
108:             */
109:            /*@ also
110:              @  public normal_behavior
111:              @    requires obj != null && obj instanceof JMLValueEqualsPair;
112:              @    ensures \result == 
113:              @            ( ((JMLValueEqualsPair)obj).key.equals(key) 
114:              @              && ((JMLValueEqualsPair)obj).value.equals(value) );
115:              @ also 
116:              @  public normal_behavior
117:              @    requires obj == null || !(obj instanceof JMLValueEqualsPair);
118:              @    ensures !\result;
119:              @*/
120:            public boolean equals(Object obj) {
121:                if (obj != null && obj instanceof  JMLValueEqualsPair) {
122:                    JMLValueEqualsPair pair = (JMLValueEqualsPair) obj;
123:                    return pair.key.equals(key) && pair.value.equals(value);
124:                } else {
125:                    return false;
126:                }
127:            }
128:
129:            /** Return a hash code for this object.
130:             */
131:            public int hashCode() {
132:                return key.hashCode() + value.hashCode();
133:            }
134:
135:            /** Return a string representation of this object.
136:             */
137:            /*@ also
138:              @  public normal_behavior
139:              @    ensures (* \result is a string that starts with a '(' followed by
140:              @                the strings representing key and value separated by
141:              @                a comma and ends with a ')' 
142:              @              *);
143:              @ for_example
144:              @   public normal_example
145:              @     requires (* key is 4 and value is 2 *);
146:              @     ensures (*  \result is the string "(4, 2)"  *);
147:              @*/
148:            public String toString() {
149:                return (new String("(") + key + new String(", ") + value + new String(
150:                        ")"));
151:            }
152:        };
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