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java Programming Glossary: visitorConstruct a tree structure from list of string paths http://stackoverflow.com/questions/1005551/construct-a-tree-structure-from-list-of-string-paths T data Tree T data this.data data void accept Visitor T visitor visitor.visitData this data for Tree child children Visitor.. Tree T data this.data data void accept Visitor T visitor visitor.visitData this data for Tree child children Visitor T childVisitor.. this data for Tree child children Visitor T childVisitor visitor.visitTree child child.accept childVisitor Tree child T data..
If/else statements in ANTLR using listeners http://stackoverflow.com/questions/15610183/if-else-statements-in-antlr-using-listeners statements using ANTLR or if I will have to implement the visitor pattern myself Also can anyone give an extremely simple example.. if you give org.antlr.v4.Tool the command line parameter visitor ANTLR generates visitor classes for you. These work much like.. the command line parameter visitor ANTLR generates visitor classes for you. These work much like listeners but give you..
http://stackoverflow.com/questions/2186931/java-pass-method-as-parameter there's another way of doing this using a Visitor . The visitor approach is a little more involved your nodes all need to be.. is a little more involved your nodes all need to be visitor aware with an acceptVisitor method but if you need to traverse..
Using Regex to generate Strings rather than match them http://stackoverflow.com/questions/22115/using-regex-to-generate-strings-rather-than-match-them These Nodes are organised into a tree. By producing a visitor that traverses this tree you should be able to call an overloaded..
Could someone in simple terms explain to me the visitor pattern's purpose with examples if possible http://stackoverflow.com/questions/2604169/could-someone-in-simple-terms-explain-to-me-the-visitor-patterns-purpose-with-e someone in simple terms explain to me the visitor pattern's purpose with examples if possible I'm really confused.. with examples if possible I'm really confused about the visitor pattern and its uses. I can't really seem to visualize the benefits.. would be great. Thanks in advance java design patterns visitor share improve this question Once upon a time... class MusicLibrary..
http://stackoverflow.com/questions/2750714/is-instanceof-considered-bad-practice-if-so-under-what-circumstances-is-instan instanceof whenever possible. Using polymorphism or the visitor pattern where applicable. I suppose it simply eases maintenance..
How to avoid large if-statements and instanceof http://stackoverflow.com/questions/3930808/how-to-avoid-large-if-statements-and-instanceof as performAction or doWhatYouAreSupposedToDo is to use the visitor pattern . Here is an example Animal import java.util. abstract.. public abstract void accept AnimalVisitor av Open up for visitors. Lion and Deer class Lion extends Animal public Lion String..
Generating XML using SAX and Java http://stackoverflow.com/questions/4898590/generating-xml-using-sax-and-java an XSLT engine. Its really just taking advantage of the visitor pattern established by the SAX framework we separate traversing..
How can I find all the methods that call a given method in Java? http://stackoverflow.com/questions/930289/how-can-i-find-all-the-methods-that-call-a-given-method-in-java would recommend ASM . Given a list of Classes to analyze a visitor can be made which finds the method calls you're interested in...
Construct a tree structure from list of string paths http://stackoverflow.com/questions/1005551/construct-a-tree-structure-from-list-of-string-paths final T data Tree T data this.data data void accept Visitor T visitor visitor.visitData this data for Tree child children.. visitor.visitData this data for Tree child children Visitor T childVisitor visitor.visitTree child child.accept childVisitor.. this data for Tree child children Visitor T childVisitor visitor.visitTree child child.accept childVisitor Tree child..
If/else statements in ANTLR using listeners http://stackoverflow.com/questions/15610183/if-else-statements-in-antlr-using-listeners b else if a b log 2 a a b b else log 3 a a b b log Done 2. Visitor I Start by generating the parser and visitor classes java cp.. above would have generated among others the file MuBaseVisitor T . This is the class we're going to extend with out own logic.. is the class we're going to extend with out own logic EvalVisitor.java public class EvalVisitor extends MuBaseVisitor Value .....
http://stackoverflow.com/questions/2186931/java-pass-method-as-parameter points out there's another way of doing this using a Visitor . The visitor approach is a little more involved your nodes.. your nodes all need to be visitor aware with an acceptVisitor method but if you need to traverse a more complex object graph..
Could someone in simple terms explain to me the visitor pattern's purpose with examples if possible http://stackoverflow.com/questions/2604169/could-someone-in-simple-terms-explain-to-me-the-visitor-patterns-purpose-with-e You could keep adding new getter methods. Or you could use Visitors. interface Visitor T visit Set T items interface MusicVisitor.. new getter methods. Or you could use Visitors. interface Visitor T visit Set T items interface MusicVisitor extends Visitor Music.. interface Visitor T visit Set T items interface MusicVisitor extends Visitor Music class MusicLibrary private Set Music collection..
How to avoid large if-statements and instanceof http://stackoverflow.com/questions/3930808/how-to-avoid-large-if-statements-and-instanceof name this.name name public abstract void accept AnimalVisitor av Open up for visitors. Lion and Deer class Lion extends Animal.. void roar System.out.println Roar public void accept AnimalVisitor av av.visit this Accept and call visit. class Deer extends.. System.out.println Running... public void accept AnimalVisitor av av.visit this Accept and call visit. Visitor interface..
http://stackoverflow.com/questions/443708/callback-functions-in-java can be used as well. public class Main public interface Visitor int doJob int a int b public static void main String args Visitor.. int doJob int a int b public static void main String args Visitor adder new Visitor public int doJob int a int b return a b.. b public static void main String args Visitor adder new Visitor public int doJob int a int b return a b Visitor multiplier..
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