From: Christian Femers <femers@in.tum.de>
Date: Tue, 24 Sep 2019 03:18:06 +0000 (+0200)
Subject: Added listener and event structure to ProjectMachineContexts
X-Git-Url: https://mograsim.net/gitweb/?p=Mograsim.git;a=commitdiff_plain;h=15020b7263b6edd100d4b0a5de317e9eaff05c27

Added listener and event structure to ProjectMachineContexts
---

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 c65a95e1..2e02e31d 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
@@ -13,6 +13,7 @@ import org.eclipse.ui.preferences.ScopedPreferenceStore;
 import net.mograsim.machine.Machine;
 import net.mograsim.machine.MachineDefinition;
 import net.mograsim.machine.MachineRegistry;
+import net.mograsim.plugin.nature.ProjectContextEvent.ProjectContextEventType;
 
 public class MachineContext
 {
@@ -113,6 +114,7 @@ public class MachineContext
 	{
 		machineDefinition = machineId.map(MachineRegistry::getMachine);
 		machineDefinition.ifPresent(md -> setActiveMachine(md.createNew()));
+		ProjectMachineContext.notifyListeners(new ProjectContextEvent(this, ProjectContextEventType.MACHINE_DEFINITION_CHANGE));
 	}
 
 	private void preferenceListener(PropertyChangeEvent changeEvent)
diff --git a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextEvent.java b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextEvent.java
new file mode 100644
index 00000000..059b3eae
--- /dev/null
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextEvent.java
@@ -0,0 +1,53 @@
+package net.mograsim.plugin.nature;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResourceChangeEvent;
+
+public class ProjectContextEvent
+{
+	private final MachineContext machineContext;
+	private final ProjectContextEventType eventType;
+
+	public ProjectContextEvent(MachineContext machineContext, ProjectContextEventType eventType)
+	{
+		this.machineContext = machineContext;
+		this.eventType = eventType;
+	}
+
+	public final MachineContext getMachineContext()
+	{
+		return machineContext;
+	}
+
+	public final ProjectContextEventType getEventType()
+	{
+		return eventType;
+	}
+
+	public final IProject getProject()
+	{
+		return machineContext.getProject();
+	}
+
+	public enum ProjectContextEventType
+	{
+		NEW, MACHINE_DEFINITION_CHANGE, OTHER_CHANGE, REFRESH, CLOSE, DELETE;
+
+		static ProjectContextEventType ofResourceChangeEvent(int id)
+		{
+			switch (id)
+			{
+			case IResourceChangeEvent.POST_CHANGE:
+				return OTHER_CHANGE;
+			case IResourceChangeEvent.PRE_CLOSE:
+				return CLOSE;
+			case IResourceChangeEvent.PRE_DELETE:
+				return DELETE;
+			case IResourceChangeEvent.PRE_REFRESH:
+				return REFRESH;
+			default:
+				return null;
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextListener.java b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextListener.java
new file mode 100644
index 00000000..f7366bc3
--- /dev/null
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectContextListener.java
@@ -0,0 +1,7 @@
+package net.mograsim.plugin.nature;
+
+@FunctionalInterface
+public interface ProjectContextListener
+{
+	void onProjectContextChange(ProjectContextEvent projectContextEvent);
+}
\ No newline at end of file
diff --git a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectMachineContext.java b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectMachineContext.java
index 0e6185c4..cf727af2 100644
--- a/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectMachineContext.java
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/ProjectMachineContext.java
@@ -2,20 +2,27 @@ package net.mograsim.plugin.nature;
 
 import java.util.Collections;
 import java.util.HashMap;
+import java.util.HashSet;
 import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Set;
 
 import org.eclipse.core.resources.IProject;
+import org.eclipse.core.resources.IResourceChangeEvent;
 import org.eclipse.core.resources.ProjectScope;
+import org.eclipse.core.resources.ResourcesPlugin;
 import org.eclipse.core.runtime.Adapters;
 import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IAdaptable;
 import org.eclipse.ui.preferences.ScopedPreferenceStore;
 
+import net.mograsim.plugin.nature.ProjectContextEvent.ProjectContextEventType;
+
 public class ProjectMachineContext
 {
 	private static Map<IProject, MachineContext> projectMachineContexts = Collections.synchronizedMap(new HashMap<>());
+	private static final Set<ProjectContextListener> listeners = Collections.synchronizedSet(new HashSet<>());
 
 	public static final String MOGRASIM_PROJECT_PREFS_NODE = "net.mograsim";
 	public static final String MACHINE_PROPERTY = "net.mograsim.projectMachineId";
@@ -28,6 +35,7 @@ public class ProjectMachineContext
 		validateMograsimNatureProject(project);
 		mc = new MachineContext(project);
 		projectMachineContexts.put(project, mc);
+		notifyListeners(new ProjectContextEvent(mc, ProjectContextEventType.NEW));
 		return mc;
 	}
 
@@ -38,6 +46,11 @@ public class ProjectMachineContext
 		return getMachineContextOf(project);
 	}
 
+	public static Map<IProject, MachineContext> getAllProjectMachineContexts()
+	{
+		return Collections.unmodifiableMap(projectMachineContexts);
+	}
+
 	static ScopedPreferenceStore getProjectPrefs(IProject mograsimProject)
 	{
 		return new ScopedPreferenceStore(new ProjectScope(mograsimProject), MOGRASIM_PROJECT_PREFS_NODE);
@@ -88,4 +101,38 @@ public class ProjectMachineContext
 			return Optional.of(preferenceStore.getString(MACHINE_PROPERTY));
 		return Optional.empty();
 	}
+
+	static void notifyListeners(ProjectContextEvent projectContextEvent)
+	{
+		listeners.forEach(l -> l.onProjectContextChange(projectContextEvent));
+	}
+
+	public static void addProjectContextListener(ProjectContextListener listener)
+	{
+		listeners.add(listener);
+	}
+
+	public static void removeProjectContextListener(ProjectContextListener listener)
+	{
+		listeners.remove(listener);
+	}
+
+	static
+	{
+		ResourcesPlugin.getWorkspace().addResourceChangeListener(ProjectMachineContext::resourceChanged);
+	}
+
+	private static void resourceChanged(IResourceChangeEvent event)
+	{
+		ProjectContextEventType eventType = ProjectContextEventType.ofResourceChangeEvent(event.getType());
+		if (eventType == null)
+			return;
+		IProject p = event.getResource().getProject();
+		if (p == null)
+			return;
+		MachineContext mc = projectMachineContexts.get(p);
+		if (mc == null)
+			return;
+		notifyListeners(new ProjectContextEvent(mc, eventType));
+	}
 }