Restructured Mograsim project nature and introduced project context

[Mograsim.git] / plugins / net.mograsim.plugin.core / src / net / mograsim / plugin / nature / MachineContext.java

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
new file mode 100644 (file)
index 0000000..b434ec9
--- /dev/null
+++ b/plugins/net.mograsim.plugin.core/src/net/mograsim/plugin/nature/MachineContext.java
@@ -0,0 +1,120 @@
+package net.mograsim.plugin.nature;
+
+import java.io.IOException;
+import java.util.Objects;
+import java.util.Optional;
+
+import org.eclipse.core.resources.IProject;
+import org.eclipse.jface.util.PropertyChangeEvent;
+import org.eclipse.ui.preferences.ScopedPreferenceStore;
+
+import net.mograsim.machine.Machine;
+import net.mograsim.machine.MachineDefinition;
+import net.mograsim.machine.MachineRegistry;
+
+public class MachineContext
+{
+       IProject owner;
+       ScopedPreferenceStore prefs;
+       Optional<String> machineId;
+       Optional<MachineDefinition> machineDefinition;
+       Optional<Machine> activeMachine;
+
+       public MachineContext(IProject owner)
+       {
+               this.owner = Objects.requireNonNull(owner);
+               prefs = ProjectMachineContext.getProjectPrefs(owner);
+               prefs.addPropertyChangeListener(this::preferenceListener);
+               machineId = ProjectMachineContext.getMachineIdFrom(prefs);
+               updateDefinition();
+       }
+
+       public final IProject getProject()
+       {
+               return owner;
+       }
+
+       public final ScopedPreferenceStore getPreferences()
+       {
+               return prefs;
+       }
+
+       /**
+        * Returns true if the project configuration is valid in the current environment
+        */
+       public final boolean isCurrentyValid()
+       {
+               return machineDefinition.isPresent();
+       }
+
+       /**
+        * Returns true if the persisted project configuration itself is intact
+        */
+       public final boolean isIntact()
+       {
+               return machineId.isPresent();
+       }
+
+       /**
+        * Returns true if a machine is instantiated and (possibly) running
+        */
+       public final boolean isActive()
+       {
+               return activeMachine.isPresent();
+       }
+
+       /**
+        * Sets the projects machineId. Will likely break things, if the {@link MachineContext} {@link #isActive()}.
+        */
+       public final boolean setMachineId(String machineId)
+       {
+               prefs.setValue(ProjectMachineContext.MACHINE_PROPERTY, machineId);
+               try
+               {
+                       prefs.save();
+               }
+               catch (IOException e)
+               {
+                       e.printStackTrace();
+                       return false;
+               }
+               return true;
+       }
+
+       /**
+        * Sets the active machine in the {@link MachineContext}'s project scope.
+        */
+       public final void setActiveMachine(Machine machine)
+       {
+               activeMachine = Optional.ofNullable(machine);
+       }
+
+       public final Optional<String> getMachineId()
+       {
+               return machineId;
+       }
+
+       public final Optional<MachineDefinition> getMachineDefinition()
+       {
+               return machineDefinition;
+       }
+
+       public final Optional<Machine> getActiveMachine()
+       {
+               return activeMachine;
+       }
+
+       final void updateDefinition()
+       {
+               machineDefinition = machineId.map(MachineRegistry::getMachine);
+       }
+
+       private void preferenceListener(PropertyChangeEvent changeEvent)
+       {
+               if (changeEvent.getProperty().equals(ProjectMachineContext.MACHINE_PROPERTY))
+               {
+                       machineId = Optional.ofNullable((String) changeEvent.getNewValue());
+                       updateDefinition();
+               }
+       }
+}
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