X-Git-Url: https://mograsim.net/gitweb/?a=blobdiff_plain;f=plugins%2Fnet.mograsim.plugin.core%2Fsrc%2Fnet%2Fmograsim%2Fplugin%2Fnature%2FMachineContext.java;fp=plugins%2Fnet.mograsim.plugin.core%2Fsrc%2Fnet%2Fmograsim%2Fplugin%2Fnature%2FMachineContext.java;h=b434ec9786505fa6bed9c30d92e937092dc1841d;hb=f919efc362c3de5c94d894dc8fc7fe22c03fc865;hp=0000000000000000000000000000000000000000;hpb=76c2b3eab6cec47490bb75713356152deb5d07ed;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
new file mode 100644
index 00000000..b434ec97
--- /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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