Profile: Add minimal implementation

This represents a wg-quick profile as two strings: the file name and
the file contents.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

app/src/main/java/com/wireguard/config/Profile.java

@@ -0,0 +1,56 @@
+package com.wireguard.config;
+
+import android.databinding.BaseObservable;
+import android.databinding.Bindable;
+import android.databinding.Observable;
+
+import com.wireguard.android.BR;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+
+/**
+ * Represents a wg-quick profile.
+ */
+
+public class Profile extends BaseObservable implements Observable {
+    private String config;
+    private final String name;
+
+    public Profile(String name) {
+        this.name = name;
+    }
+
+    public void fromStream(InputStream stream)
+            throws IOException {
+        final StringBuilder sb = new StringBuilder(stream.available());
+        String line;
+        try (BufferedReader reader = new BufferedReader(new InputStreamReader(stream))) {
+            while ((line = reader.readLine()) != null)
+                sb.append(line).append('\n');
+        }
+        setConfig(sb.toString());
+    }
+
+    @Bindable
+    public String getConfig() {
+        return config;
+    }
+
+    @Bindable
+    public String getName() {
+        return name;
+    }
+
+    public void setConfig(String config) {
+        this.config = config;
+        notifyPropertyChanged(BR.config);
+    }
+
+    @Override
+    public String toString() {
+        return getConfig();
+    }
+}