X-Git-Url: https://mograsim.net/gitweb/?a=blobdiff_plain;f=plugins%2Fnet.mograsim.plugin.core%2Fsrc%2Fnet%2Fmograsim%2Fplugin%2Fnature%2FMachineContext.java;h=b1708482514def0ded98bbacd3b584d979c709aa;hb=59afdc935cc4455d8ade9264b81b3cf7a8223eda;hp=b434ec9786505fa6bed9c30d92e937092dc1841d;hpb=51a65b109c1c7e9d0be14556c39c81a9f71c4e0c;p=Mograsim.git

diff --git a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/MachineContext.java b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/MachineContext.java
index b434ec97..b1708482 100644
--- a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/MachineContext.java
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/MachineContext.java
@@ -1,8 +1,10 @@
 package net.mograsim.plugin.nature;
 
 import java.io.IOException;
+import java.util.HashSet;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
 
 import org.eclipse.core.resources.IProject;
 import org.eclipse.jface.util.PropertyChangeEvent;
@@ -20,6 +22,8 @@ public class MachineContext
 	Optional<MachineDefinition> machineDefinition;
 	Optional<Machine> activeMachine;
 
+	private final Set<ActiveMachineListener> observers = new HashSet<>();
+
 	public MachineContext(IProject owner)
 	{
 		this.owner = Objects.requireNonNull(owner);
@@ -87,6 +91,7 @@ public class MachineContext
 	public final void setActiveMachine(Machine machine)
 	{
 		activeMachine = Optional.ofNullable(machine);
+		notifyObservers();
 	}
 
 	public final Optional<String> getMachineId()
@@ -117,4 +122,26 @@ public class MachineContext
 			updateDefinition();
 		}
 	}
+
+	public void registerObserver(ActiveMachineListener ob)
+	{
+		observers.add(ob);
+		ob.setMachine(activeMachine);
+	}
+
+	public void deregisterObserver(ActiveMachineListener ob)
+	{
+		observers.remove(ob);
+	}
+
+	private void notifyObservers()
+	{
+		observers.forEach(ob -> ob.setMachine(activeMachine));
+	}
+
+	@FunctionalInterface
+	public static interface ActiveMachineListener
+	{
+		void setMachine(Optional<Machine> machine);
+	}
 }
\ No newline at end of file