Add removable drive plugin.

bramble-api/src/main/java/org/briarproject/bramble/api/plugin/RemovableDriveConstants.java

@@ -0,0 +1,6 @@
+package org.briarproject.bramble.api.plugin;
+
+public interface RemovableDriveConstants {
+
+	TransportId ID = new TransportId("org.briarproject.bramble.drive");
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDrivePlugin.java

@@ -0,0 +1,96 @@
+package org.briarproject.bramble.plugin.file;
+
+import org.briarproject.bramble.api.Pair;
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.ConnectionHandler;
+import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.properties.TransportProperties;
+
+import java.io.File;
+import java.util.Collection;
+import java.util.logging.Logger;
+
+import javax.annotation.concurrent.Immutable;
+
+import static java.util.logging.Level.INFO;
+import static java.util.logging.Logger.getLogger;
+import static org.briarproject.bramble.api.plugin.Plugin.State.ACTIVE;
+import static org.briarproject.bramble.api.plugin.RemovableDriveConstants.ID;
+
+@Immutable
+@NotNullByDefault
+class RemovableDrivePlugin extends FilePlugin {
+
+	private static final Logger LOG =
+			getLogger(RemovableDrivePlugin.class.getName());
+
+	RemovableDrivePlugin(PluginCallback callback, int maxLatency) {
+		super(callback, maxLatency);
+	}
+
+	@Override
+	protected void writerFinished(File f, boolean exception) {
+		if (LOG.isLoggable(INFO)) {
+			LOG.info("Writer finished, exception: " + exception);
+		}
+	}
+
+	@Override
+	protected void readerFinished(File f, boolean exception,
+			boolean recognised) {
+		if (LOG.isLoggable(INFO)) {
+			LOG.info("Reader finished, exception: " + exception
+					+ ", recognised: " + recognised);
+		}
+		// Try to delete the file if the read finished successfully
+		if (recognised && !exception && !f.delete()) {
+			LOG.info("Failed to delete recognised file");
+		}
+	}
+
+	@Override
+	public TransportId getId() {
+		return ID;
+	}
+
+	@Override
+	public void start() {
+	}
+
+	@Override
+	public void stop() {
+	}
+
+	@Override
+	public State getState() {
+		return ACTIVE;
+	}
+
+	@Override
+	public int getReasonsDisabled() {
+		return 0;
+	}
+
+	@Override
+	public int getMaxIdleTime() {
+		// Unused for simplex transports
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public boolean shouldPoll() {
+		return false;
+	}
+
+	@Override
+	public int getPollingInterval() {
+		throw new UnsupportedOperationException();
+	}
+
+	@Override
+	public void poll(
+			Collection<Pair<TransportProperties, ConnectionHandler>> properties) {
+		throw new UnsupportedOperationException();
+	}
+}

bramble-core/src/main/java/org/briarproject/bramble/plugin/file/RemovableDrivePluginFactory.java

@@ -0,0 +1,36 @@
+package org.briarproject.bramble.plugin.file;
+
+import org.briarproject.bramble.api.nullsafety.NotNullByDefault;
+import org.briarproject.bramble.api.plugin.PluginCallback;
+import org.briarproject.bramble.api.plugin.TransportId;
+import org.briarproject.bramble.api.plugin.simplex.SimplexPlugin;
+import org.briarproject.bramble.api.plugin.simplex.SimplexPluginFactory;
+
+import javax.annotation.Nullable;
+import javax.annotation.concurrent.Immutable;
+
+import static java.util.concurrent.TimeUnit.DAYS;
+import static org.briarproject.bramble.api.plugin.RemovableDriveConstants.ID;
+
+@Immutable
+@NotNullByDefault
+public class RemovableDrivePluginFactory implements SimplexPluginFactory {
+
+	private final int MAX_LATENCY = (int) DAYS.toMillis(14);
+
+	@Override
+	public TransportId getId() {
+		return ID;
+	}
+
+	@Override
+	public int getMaxLatency() {
+		return MAX_LATENCY;
+	}
+
+	@Nullable
+	@Override
+	public SimplexPlugin createPlugin(PluginCallback callback) {
+		return new RemovableDrivePlugin(callback, MAX_LATENCY);
+	}
+}