Clean Code

Listing B-6 (continued)
RelativeDayOfWeekRule.java

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392
Appendix B: 
org.jfree.date.SerialDate
125 */
126 public void setDayOfWeek(final int dayOfWeek) {
127 this.dayOfWeek = dayOfWeek;
128 }
129 
130 /**
131 * Returns the 'relative' attribute, that determines *which*
132 * day-of-the-week we are interested in (SerialDate.PRECEDING,
133 * SerialDate.NEAREST or SerialDate.FOLLOWING).
134 *
135 * @return The 'relative' attribute.
136 */
137 public int getRelative() {
138 return this.relative;
139 }
140 
141 /**
142 * Sets the 'relative' attribute (SerialDate.PRECEDING, SerialDate.NEAREST,
143 * SerialDate.FOLLOWING).
144 *
145 * @param relative determines *which* day-of-the-week is selected by this
146 * rule.
147 */
148 public void setRelative(final int relative) {
149 this.relative = relative;
150 }
151 
152 /**
153 * Creates a clone of this rule.
154 *
155 * @return a clone of this rule.
156 *
157 * @throws CloneNotSupportedException this should never happen.
158 */
159 public Object clone() throws CloneNotSupportedException {
160 final RelativeDayOfWeekRule duplicate
161 = (RelativeDayOfWeekRule) super.clone();
162 duplicate.subrule = (AnnualDateRule) duplicate.getSubrule().clone();
163 return duplicate;
164 }
165 
166 /**
167 * Returns the date generated by this rule, for the specified year.
168 *
169 * @param year the year (1900 <= year <= 9999).
170 *
171 * @return The date generated by the rule for the given year (possibly
172 * null).
173 */
174 public SerialDate getDate(final int year) {
175 
176 // check argument...
177 if ((year < SerialDate.MINIMUM_YEAR_SUPPORTED)
178 || (year > SerialDate.MAXIMUM_YEAR_SUPPORTED)) {
179 throw new IllegalArgumentException(
180 "RelativeDayOfWeekRule.getDate(): year outside valid range.");
181 }
182 
183 // calculate the date...
184 SerialDate result = null;
185 final SerialDate base = this.subrule.getDate(year);
186