org.javagen.agile.db.visitor
Class DatabaseWalker

java.lang.Object
  org.javagen.agile.db.visitor.DatabaseWalker

public class DatabaseWalker
extends Object

Traversal part of visitor pattern as applied to database hierarchy.

CAUTION: For some applications it may be necessary to walks the tree twice to avoid null references. Once to visit tables and columns and a second pass to visit the foreign keys and their references after all tables/columns have been processed.

In these situations implement the Generator interface like so:

 public void gen(Model database) {
   DatabaseWalker.walk(database, visitor, DatabaseVisitor.NON_FK_MODEL_TYPES);
   DatabaseWalker.walk(database, visitor, DatabaseVisitor.FK_ONLY_MODEL_TYPES);
   return database;
 }
 

Author:

Richard Easterling

Constructor Summary

DatabaseWalker()

Method Summary

static void	walk(Database database, DatabaseVisitor visitor) Walk the database model tree using the visitor's itinerary.
static void	walk(Model model, DatabaseVisitor visitor, Set<String> itinerary)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DatabaseWalker

public DatabaseWalker()

Method Detail

walk

public static void walk(Database database,
                        DatabaseVisitor visitor)

Walk the database model tree using the visitor's itinerary.

Parameters:

database - root node of the tree

visitor - implementation to apply to the tree

walk

public static void walk(Model model,
                        DatabaseVisitor visitor,
                        Set<String> itinerary)