Source Code Cross Referenced for JMLByte.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: JMLByte.java 1.3 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:        /** A reflection of {@link java.lang.Byte} that implements {@link JMLType}.
024:         *
025:         * @version $Revision: 1.3 $
026:         * @author Gary T. Leavens
027:         * @author Brandon Shilling
028:         * @see java.lang.Byte
029:         * @see JMLType
030:         * @see JMLChar
031:         * @see JMLInteger
032:         * @see JMLShort
033:         * @see JMLLong
034:         */
035:        //-@ immutable
036:        public/*@ pure @*/class JMLByte implements  JMLComparable {
037:
038:            /** The byte value of this object.
039:             */
040:            //@ public model byte theByte;
041:            //@ public constraint theByte == \old(theByte);
042:            private byte byteValue;
043:
044:            //@             in theByte;
045:            //@ private represents theByte <- byteValue;
046:
047:            //@ public invariant owner == null;
048:
049:            /** Initialize this object to 0.
050:             */
051:            /*@  public normal_behavior
052:              @    assignable theByte, owner;
053:              @    ensures theByte == 0;
054:              @*/
055:            public JMLByte() {
056:                byteValue = 0;
057:            }
058:
059:            /** Initialize this object to the given byte.
060:             */
061:            /*@  public normal_behavior
062:              @    assignable theByte, owner;
063:              @    ensures theByte == inByte;
064:              @*/
065:            public JMLByte(byte inByte) {
066:                byteValue = inByte;
067:            }
068:
069:            /** Initialize this object to the given byte.
070:             *  @param inByte an object containing the value to use.
071:             */
072:            /*@  public normal_behavior
073:              @    requires inByte != null;
074:              @    assignable theByte, owner;
075:              @    ensures theByte == inByte.byteValue();
076:              @*/
077:            public JMLByte(/*@ non_null */Byte inByte) {
078:                byteValue = inByte.byteValue();
079:            }
080:
081:            /** Initialize this object to the given byte.
082:             *  @param s a string that contains the decimal representation of
083:             *  the desired value.
084:             */
085:            /*@  public behavior
086:              @    requires s != null
087:              @          && (* s is a properly formatted byte literal *);
088:              @    assignable theByte, owner;
089:              @    ensures theByte == (new Byte(s)).byteValue();
090:              @*/
091:            public JMLByte(/*@ non_null @*/String s) throws JMLTypeException {
092:                try {
093:                    byteValue = Byte.valueOf(s).byteValue();
094:                } catch (RuntimeException re) {
095:                    throw new JMLTypeException("Bad format string passed to "
096:                            + "JMLByte(String): \"" + s + "\"");
097:                }
098:            }
099:
100:            /** The JMLByte that represents zero.
101:             */
102:            public static final JMLByte ZERO = new JMLByte();
103:
104:            /** The JMLByte that represents one.
105:             */
106:            public static final JMLByte ONE = new JMLByte((byte) 1);
107:
108:            /** Return a clone of this object.
109:             */
110:            /*@ also
111:              @   public normal_behavior
112:              @     ensures \result instanceof JMLByte
113:              @     	  && ((JMLByte)\result).theByte == theByte;
114:              @*/
115:            public Object clone() {
116:                return this ;
117:            }
118:
119:            /** Compare this to op2, returning a comparison code.
120:             *  @param op2 the object this is compared to.
121:             *  @exception ClassCastException when o is not a JMLByte.
122:             */
123:            /*@ also
124:              @   public normal_behavior
125:              @    requires op2 instanceof JMLByte;
126:              @    ensures (theByte < ((JMLByte)op2).theByte ==> \result == -1)
127:              @         && (theByte == ((JMLByte)op2).theByte ==> \result == 0)
128:              @         && (theByte > ((JMLByte)op2).theByte ==> \result == +1);
129:              @ also
130:              @   public exceptional_behavior
131:              @    requires !(op2 instanceof JMLByte);
132:              @    signals (ClassCastException);
133:              @*/
134:            public int compareTo(Object op2) throws ClassCastException {
135:                if (op2 instanceof  JMLByte) {
136:                    byte bv2 = ((JMLByte) op2).byteValue;
137:                    if (byteValue < bv2) {
138:                        return -1;
139:                    } else if (byteValue == bv2) {
140:                        return 0;
141:                    } else {
142:                        return +1;
143:                    }
144:                } else {
145:                    throw new ClassCastException();
146:                }
147:            }
148:
149:            /** Test whether this object's value is equal to the given argument.
150:             */
151:            /*@ also
152:              @   public normal_behavior
153:              @     ensures \result <==> op2 != null && op2 instanceof JMLByte 
154:              @                          && theByte == ((JMLByte)op2).theByte;
155:              @*/
156:            public boolean equals(Object op2) {
157:                return op2 != null && op2 instanceof  JMLByte
158:                        && byteValue == ((JMLByte) op2).byteValue;
159:            }
160:
161:            /** Return a hash code for this object.
162:             */
163:            public/*@ pure @*/int hashCode() {
164:                return byteValue;
165:            }
166:
167:            /** Return the byte value in this object.
168:             */
169:            /*@  public normal_behavior
170:              @    ensures \result == theByte;
171:              @*/
172:            public byte byteValue() {
173:                return byteValue;
174:            }
175:
176:            /** Return an Byte object containing the byte value in this
177:             * object.
178:             */
179:            /*@  public normal_behavior
180:              @    ensures \result != null && \result.equals(new Byte(theByte));
181:              @*/
182:            public/*@ non_null @*/Byte getByte() {
183:                return new Byte(byteValue);
184:            }
185:
186:            /** Return a new object containing the negation of this object's
187:             * byte value.
188:             */
189:            /*@  public normal_behavior
190:              @    ensures \result != null && 
191:              @      \result.theByte == \nowarn_op((byte)- theByte);
192:              @*/
193:            public/*@ non_null @*/JMLByte negated() {
194:                return new JMLByte((byte) -byteValue);
195:            }
196:
197:            /** Return a new object containing the sum of this object's
198:             *  byte value and that of the given argument.
199:             */
200:            /*@  public normal_behavior
201:              @    requires i2 != null;
202:              @    ensures \result != null
203:              @         && \result.theByte == \nowarn_op((byte)(theByte + i2.theByte));
204:              @*/
205:            public/*@ non_null @*/JMLByte plus(/*@ non_null @*/JMLByte i2) {
206:                return new JMLByte((byte) (byteValue + i2.byteValue));
207:            }
208:
209:            /** Return a new object containing the difference between this object's
210:             *  byte value and that of the given argument.
211:             */
212:            /*@  public normal_behavior
213:              @    requires i2 != null;
214:              @    ensures \result != null
215:              @         && \result.theByte == \nowarn_op((byte)(theByte - i2.theByte));
216:              @*/
217:            public/*@ non_null @*/JMLByte minus(/*@ non_null @*/JMLByte i2) {
218:                return new JMLByte((byte) (byteValue - i2.byteValue));
219:            }
220:
221:            /** Return a new object containing the product of this object's
222:             * byte value and that of the given argument.
223:             */
224:            /*@  public normal_behavior
225:              @    requires i2 != null;
226:              @    ensures \result != null
227:              @         && \result.theByte == \nowarn_op((byte)(theByte * i2.theByte));
228:              @*/
229:            public/*@ non_null @*/JMLByte times(/*@ non_null @*/JMLByte i2) {
230:                return new JMLByte((byte) (byteValue * i2.byteValue));
231:            }
232:
233:            /** Return a new object containing the quotient of this object's
234:             *  byte value divided by that of the given argument.
235:             */
236:            /*@  public normal_behavior
237:              @    requires i2 != null && !i2.equals(new JMLByte((byte)0));
238:              @    ensures \result != null
239:              @         && \result.theByte == \nowarn_op((byte)(theByte / i2.theByte));
240:              @*/
241:            public/*@ non_null @*/JMLByte dividedBy(/*@ non_null @*/JMLByte i2) {
242:                return new JMLByte((byte) (byteValue / i2.byteValue));
243:            }
244:
245:            /** Return a new object containing the remainder of this object's
246:             *  byte value divided by that of the given argument.
247:             */
248:            /*@  public normal_behavior
249:              @    requires i2 != null && !i2.equals(new JMLByte((byte)0));
250:              @    ensures \result != null
251:              @         && \result.theByte == theByte % i2.theByte;
252:              @    // theByte % i2.theByte will always fit within a byte.
253:              @*/
254:            public/*@ non_null @*/
255:            JMLByte remainderBy(/*@ non_null @*/JMLByte i2) {
256:                return new JMLByte((byte) (byteValue % i2.byteValue));
257:            }
258:
259:            /** Tell whether this object's byte value is strictly greater
260:             *  than that of the given argument.
261:             */
262:            /*@  public normal_behavior
263:              @    requires i2 != null;
264:              @    ensures \result <==> theByte > i2.theByte;
265:              @*/
266:            public boolean greaterThan(/*@ non_null */JMLByte i2) {
267:                return byteValue > i2.byteValue;
268:            }
269:
270:            /** Tell whether this object's byte value is strictly less
271:             *  than that of the given argument.
272:             */
273:            /*@  public normal_behavior
274:              @    requires i2 != null;
275:              @    ensures \result <==> theByte < i2.theByte;
276:              @*/
277:            public boolean lessThan(/*@ non_null */JMLByte i2) {
278:                return byteValue < i2.byteValue;
279:            }
280:
281:            /** Tell whether this object's byte value is greater than or equal
282:             *  to that of the given argument.
283:             */
284:            /*@  public normal_behavior
285:              @    requires i2 != null;
286:              @    ensures \result <==> theByte >= i2.theByte;
287:              @*/
288:            public boolean greaterThanOrEqualTo(/*@ non_null */JMLByte i2) {
289:                return byteValue >= i2.byteValue;
290:            }
291:
292:            /** Tell whether this object's byte value is less than or equal
293:             *  to that of the given argument.
294:             */
295:            /*@  public normal_behavior
296:              @    requires i2 != null;
297:              @    ensures \result <==> theByte <= i2.theByte;
298:              @*/
299:            public boolean lessThanOrEqualTo(/*@ non_null */JMLByte i2) {
300:                return byteValue <= i2.byteValue;
301:            }
302:
303:            /** Return a string representation of this object.
304:             */
305:            /*@ also
306:              @   public normal_behavior
307:              @     ensures \result != null && \result.equals(getByte().toString());
308:              @*/
309:            public String toString() {
310:                return String.valueOf(byteValue);
311:            }
312:
313:        }
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