ToolsInstaller: Extract to its own classes

Signed-off-by: Samuel Holland <samuel@sholland.org>

1 files changed, 91 insertions, 0 deletions

diff --git a/app/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.java b/app/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.java
new file mode 100644
index 00000000..c9dfa7b7
--- /dev/null
+++ b/app/src/main/java/com/wireguard/android/preference/ToolsInstallerPreference.java
@@ -0,0 +1,91 @@
+package com.wireguard.android.preference;
+
+import android.content.Context;
+import android.preference.Preference;
+import android.system.OsConstants;
+import android.util.AttributeSet;
+
+import com.wireguard.android.Application;
+import com.wireguard.android.Application.ApplicationComponent;
+import com.wireguard.android.R;
+import com.wireguard.android.util.AsyncWorker;
+import com.wireguard.android.util.ToolsInstaller;
+
+/**
+ * Preference implementing a button that asynchronously runs {@code ToolsInstaller} and displays the
+ * result as the preference summary.
+ */
+
+public class ToolsInstallerPreference extends Preference {
+    private final AsyncWorker asyncWorker;
+    private final ToolsInstaller toolsInstaller;
+    private State state = State.INITIAL;
+
+    public ToolsInstallerPreference(final Context context, final AttributeSet attrs) {
+        super(context, attrs);
+        final ApplicationComponent applicationComponent = Application.getComponent();
+        asyncWorker = applicationComponent.getAsyncWorker();
+        toolsInstaller = applicationComponent.getToolsInstaller();
+    }
+
+    public ToolsInstallerPreference(final Context context) {
+        this(context, null);
+    }
+
+    private static State mapResultToState(final int scriptResult) {
+        if (scriptResult == OsConstants.EXIT_SUCCESS)
+            return State.SUCCESS;
+        else if (scriptResult == OsConstants.EALREADY)
+            return State.ALREADY;
+        else
+            return State.FAILURE;
+    }
+
+    @Override
+    public CharSequence getSummary() {
+        return getContext().getString(state.messageResourceId);
+    }
+
+    @Override
+    public CharSequence getTitle() {
+        return getContext().getString(getTitleRes());
+    }
+
+    @Override
+    public int getTitleRes() {
+        return R.string.tools_installer_title;
+    }
+
+    @Override
+    protected void onClick() {
+        setState(State.WORKING);
+        asyncWorker.supplyAsync(toolsInstaller::install)
+                .thenApply(ToolsInstallerPreference::mapResultToState)
+                .thenAccept(this::setState);
+    }
+
+    private void setState(final State state) {
+        if (this.state == state)
+            return;
+        this.state = state;
+        if (isEnabled() != state.shouldEnableView)
+            setEnabled(state.shouldEnableView);
+        notifyChanged();
+    }
+
+    private enum State {
+        ALREADY(R.string.tools_installer_already, false),
+        FAILURE(R.string.tools_installer_failure, true),
+        INITIAL(R.string.tools_installer_initial, true),
+        SUCCESS(R.string.tools_installer_success, false),
+        WORKING(R.string.tools_installer_working, false);
+
+        private final int messageResourceId;
+        private final boolean shouldEnableView;
+
+        State(final int messageResourceId, final boolean shouldEnableView) {
+            this.messageResourceId = messageResourceId;
+            this.shouldEnableView = shouldEnableView;
+        }
+    }
+}