[Settings] Add ImsQueryProvisioningStat for VT

1. Code refactor
2. Add ImsQueryProvisioningStat class for VT's use case

Bug: 140542283
Test: m RunSettingsRoboTests -j ROBOTEST_FILTER=VideoCallingPreferenceControllerTest
Change-Id: I40ec5df00d02e71cb8ae78d4f81c71c5e354515a

src/com/android/settings/network/ims/ImsQueryProvisioningStat.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2020 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.settings.network.ims;
+
+import android.telephony.ims.ProvisioningManager;
+import android.telephony.ims.feature.MmTelFeature;
+import android.telephony.ims.stub.ImsRegistrationImplBase;
+
+
+/**
+ * An {@code ImsQuery} for accessing IMS provision stat
+ */
+public class ImsQueryProvisioningStat implements ImsQuery {
+
+    private volatile int mSubId;
+    private volatile int mCapability;
+    private volatile int mTech;
+
+    /**
+     * Constructor
+     * @param subId subscription id
+     * @param capability {@code MmTelFeature.MmTelCapabilities.MmTelCapability}
+     * @param tech {@code @ImsRegistrationImplBase.ImsRegistrationTech}
+     */
+    public ImsQueryProvisioningStat(int subId,
+            @MmTelFeature.MmTelCapabilities.MmTelCapability int capability,
+            @ImsRegistrationImplBase.ImsRegistrationTech int tech) {
+        mSubId = subId;
+        mCapability = capability;
+        mTech = tech;
+    }
+
+    /**
+     * Implementation of interface {@code ImsQuery}
+     *
+     * @return result of query
+     */
+    public boolean query() {
+        final ProvisioningManager privisionManager =
+                ProvisioningManager.createForSubscriptionId(mSubId);
+        return privisionManager.getProvisioningStatusForCapability(mCapability, mTech);
+    }
+}