bundles/org.simantics.scl.commands/src/org/simantics/scl/commands/Commands.java

   1 package org.simantics.scl.commands;
   2
   3 import java.util.concurrent.ConcurrentHashMap;
   4
   5 import org.simantics.db.ReadGraph;
   6 import org.simantics.scl.commands.internal.CommandImpl;
   7
   8
   9 public class Commands {
  10     private static final ConcurrentHashMap<String, Command> COMMAND_CACHE =
  11             new ConcurrentHashMap<String, Command>();
  12
  13     /**
  14      * Returns a command object of given type. This method always succeeds,
  15      * but may return a command object whose check-method always returns fail
  16      * and commit will throw an exception.
  17      */
  18     public static Command get(ReadGraph graph, String name) {
  19         Command command = COMMAND_CACHE.get(name);
  20         if(command == null) {
  21             command = CommandImpl.create(graph, name);
  22             COMMAND_CACHE.put(name, command);
  23         }
  24         return command;
  25     }
  26 }