17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.lang.model.util; 27 28 import javax.lang.model.element.*; 29 import javax.annotation.processing.SupportedSourceVersion; 30 import javax.lang.model.SourceVersion; 31 import static javax.lang.model.SourceVersion.*; 32 33 34 /** 35 * A scanning visitor of program elements with default behavior 36 * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7} 37 * source version. The <code>visit<i>XYZ</i></code> methods in this 38 * class scan their component elements by calling {@code scan} on 39 * their {@linkplain Element#getEnclosedElements enclosed elements}, 40 * {@linkplain ExecutableElement#getParameters parameters}, etc., as 41 * indicated in the individual method specifications. A subclass can 42 * control the order elements are visited by overriding the 43 * <code>visit<i>XYZ</i></code> methods. Note that clients of a scanner 44 * may get the desired behavior be invoking {@code v.scan(e, p)} rather 45 * than {@code v.visit(e, p)} on the root objects of interest. 46 * 47 * <p>When a subclass overrides a <code>visit<i>XYZ</i></code> method, the 48 * new method can cause the enclosed elements to be scanned in the 49 * default way by calling <code>super.visit<i>XYZ</i></code>. In this 50 * fashion, the concrete visitor can control the ordering of traversal 51 * over the component elements with respect to the additional 52 * processing; for example, consistently calling 53 * <code>super.visit<i>XYZ</i></code> at the start of the overridden 54 * methods will yield a preorder traversal, etc. If the component 55 * elements should be traversed in some other order, instead of 56 * calling <code>super.visit<i>XYZ</i></code>, an overriding visit method 57 * should call {@code scan} with the elements in the desired order. 58 * 59 * <p> Methods in this class may be overridden subject to their 60 * general contract. Note that annotating methods in concrete 61 * subclasses with {@link java.lang.Override @Override} will help 62 * ensure that methods are overridden as intended. 63 * 64 * <p> <b>WARNING:</b> The {@code ElementVisitor} interface 65 * implemented by this class may have methods added to it in the 66 * future to accommodate new, currently unknown, language structures 67 * added to future versions of the Java™ programming language. 68 * Therefore, methods whose names begin with {@code "visit"} may be 69 * added to this class in the future; to avoid incompatibilities, 70 * classes which extend this class should not declare any instance 71 * methods with names beginning with {@code "visit"}. 72 * 73 * <p>When such a new visit method is added, the default 74 * implementation in this class will be to call the {@link 75 * #visitUnknown visitUnknown} method. A new element scanner visitor 76 * class will also be introduced to correspond to the new language | 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package javax.lang.model.util; 27 28 import javax.lang.model.element.*; 29 import javax.annotation.processing.SupportedSourceVersion; 30 import javax.lang.model.SourceVersion; 31 import static javax.lang.model.SourceVersion.*; 32 33 34 /** 35 * A scanning visitor of program elements with default behavior 36 * appropriate for the {@link SourceVersion#RELEASE_7 RELEASE_7} 37 * source version. The <code>visit<i>Xyz</i></code> methods in this 38 * class scan their component elements by calling {@code scan} on 39 * their {@linkplain Element#getEnclosedElements enclosed elements}, 40 * {@linkplain ExecutableElement#getParameters parameters}, etc., as 41 * indicated in the individual method specifications. A subclass can 42 * control the order elements are visited by overriding the 43 * <code>visit<i>Xyz</i></code> methods. Note that clients of a scanner 44 * may get the desired behavior be invoking {@code v.scan(e, p)} rather 45 * than {@code v.visit(e, p)} on the root objects of interest. 46 * 47 * <p>When a subclass overrides a <code>visit<i>Xyz</i></code> method, the 48 * new method can cause the enclosed elements to be scanned in the 49 * default way by calling <code>super.visit<i>Xyz</i></code>. In this 50 * fashion, the concrete visitor can control the ordering of traversal 51 * over the component elements with respect to the additional 52 * processing; for example, consistently calling 53 * <code>super.visit<i>Xyz</i></code> at the start of the overridden 54 * methods will yield a preorder traversal, etc. If the component 55 * elements should be traversed in some other order, instead of 56 * calling <code>super.visit<i>Xyz</i></code>, an overriding visit method 57 * should call {@code scan} with the elements in the desired order. 58 * 59 * <p> Methods in this class may be overridden subject to their 60 * general contract. Note that annotating methods in concrete 61 * subclasses with {@link java.lang.Override @Override} will help 62 * ensure that methods are overridden as intended. 63 * 64 * <p> <b>WARNING:</b> The {@code ElementVisitor} interface 65 * implemented by this class may have methods added to it in the 66 * future to accommodate new, currently unknown, language structures 67 * added to future versions of the Java™ programming language. 68 * Therefore, methods whose names begin with {@code "visit"} may be 69 * added to this class in the future; to avoid incompatibilities, 70 * classes which extend this class should not declare any instance 71 * methods with names beginning with {@code "visit"}. 72 * 73 * <p>When such a new visit method is added, the default 74 * implementation in this class will be to call the {@link 75 * #visitUnknown visitUnknown} method. A new element scanner visitor 76 * class will also be introduced to correspond to the new language |