Move generatePreferenceKey to AccessPointPreference.

This allows it to be reused in the SavedAccessPointsWifiSettings.

Bug: b/62374459
Test: make -j40 RunSettingsLibRoboTests
Change-Id: Id137f56ceafe461d217c0eee6b571ccfa4eaff1f

packages/SettingsLib/src/com/android/settingslib/wifi/AccessPointPreference.java

@@ -70,6 +70,19 @@ public class AccessPointPreference extends Preference {
             R.string.accessibility_wifi_signal_full
     };
 
+    public static String generatePreferenceKey(AccessPoint accessPoint) {
+        StringBuilder builder = new StringBuilder();
+
+        if (TextUtils.isEmpty(accessPoint.getBssid())) {
+            builder.append(accessPoint.getSsidStr());
+        } else {
+            builder.append(accessPoint.getBssid());
+        }
+
+        builder.append(',').append(accessPoint.getSecurity());
+        return builder.toString();
+    }
+
     // Used for dummy pref.
     public AccessPointPreference(Context context, AttributeSet attrs) {
         super(context, attrs);

packages/SettingsLib/src/com/android/settingslib/wifi/TestAccessPointBuilder.java

@@ -36,6 +36,7 @@ public class TestAccessPointBuilder {
     private static final int MAX_RSSI = -55;
 
     // set some sensible defaults
+    private String mBssid = null;
     private int mRssi = AccessPoint.UNREACHABLE_RSSI;
     private int mNetworkId = WifiConfiguration.INVALID_NETWORK_ID;
     private String ssid = "TestSsid";
@@ -57,6 +58,7 @@ public class TestAccessPointBuilder {
 
         WifiConfiguration wifiConfig = new WifiConfiguration();
         wifiConfig.networkId = mNetworkId;
+        wifiConfig.BSSID = mBssid;
 
         bundle.putString(AccessPoint.KEY_SSID, ssid);
         bundle.putParcelable(AccessPoint.KEY_CONFIG, wifiConfig);
@@ -179,4 +181,9 @@ public class TestAccessPointBuilder {
         mNetworkId = networkId;
         return this;
     }
+
+    public TestAccessPointBuilder setBssid(String bssid) {
+        mBssid = bssid;
+        return this;
+    }
 }

packages/SettingsLib/tests/robotests/src/com/android/settingslib/wifi/AccessPointPreferenceTest.java

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settingslib.wifi;
+
+import static com.google.common.truth.Truth.assertThat;
+
+import android.content.Context;
+
+import com.android.settingslib.SettingLibRobolectricTestRunner;
+import com.android.settingslib.TestConfig;
+
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.robolectric.RuntimeEnvironment;
+import org.robolectric.annotation.Config;
+
+@RunWith(SettingLibRobolectricTestRunner.class)
+@Config(manifest = TestConfig.MANIFEST_PATH, sdk = TestConfig.SDK_VERSION)
+public class AccessPointPreferenceTest {
+
+    private Context mContext = RuntimeEnvironment.application;
+
+    @Test
+    public void generatePreferenceKey_shouldReturnSsidPlusSecurity() {
+        String ssid = "ssid";
+        int security = AccessPoint.SECURITY_WEP;
+        String expectedKey = ssid + ',' + security;
+
+        TestAccessPointBuilder builder = new TestAccessPointBuilder(mContext);
+        builder.setSsid(ssid).setSecurity(security);
+
+        assertThat(AccessPointPreference.generatePreferenceKey(builder.build()))
+                .isEqualTo(expectedKey);
+    }
+
+    @Test
+    public void generatePreferenceKey_shouldReturnBssidPlusSecurity() {
+        String bssid = "bssid";
+        int security = AccessPoint.SECURITY_WEP;
+        String expectedKey = bssid + ',' + security;
+
+        TestAccessPointBuilder builder = new TestAccessPointBuilder(mContext);
+        builder.setBssid(bssid).setSecurity(security);
+
+        assertThat(AccessPointPreference.generatePreferenceKey(builder.build()))
+                .isEqualTo(expectedKey);
+    }
+}