Created typed class pin result in keyguard

* The initial goal was to remove PhoneConstants.
But in doing so, it made sense to replace an int[] array as a
return type with a strongly typed class called PinResult.
* In this push, the @SystemAPI is being defined.
The modification to keyguard will come in a following commit.

Bug: 147854704
Test: make
Change-Id: I0d1354fadda4143260f377ff8ff868b99b9c53d8
diff --git a/api/system-current.txt b/api/system-current.txt
index 4c19888..82f6ac5 100755
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -10317,6 +10317,19 @@
     field public static final int LISTEN_VOICE_ACTIVATION_STATE = 131072; // 0x20000
   }
 
+  public final class PinResult implements android.os.Parcelable {
+    ctor public PinResult(int, int);
+    method public int describeContents();
+    method public int getAttemptsRemaining();
+    method @NonNull public static android.telephony.PinResult getDefaultFailedResult();
+    method public int getType();
+    method public void writeToParcel(@NonNull android.os.Parcel, int);
+    field @NonNull public static final android.os.Parcelable.Creator<android.telephony.PinResult> CREATOR;
+    field public static final int PIN_RESULT_TYPE_FAILURE = 2; // 0x2
+    field public static final int PIN_RESULT_TYPE_INCORRECT = 1; // 0x1
+    field public static final int PIN_RESULT_TYPE_SUCCESS = 0; // 0x0
+  }
+
   public final class PreciseCallState implements android.os.Parcelable {
     ctor public PreciseCallState(int, int, int, int, int);
     method public int describeContents();
@@ -10799,9 +10812,11 @@
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setVoiceActivationState(int);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void shutdownAllRadios();
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean supplyPin(String);
-    method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int[] supplyPinReportResult(String);
+    method @Nullable @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public android.telephony.PinResult supplyPinReportPinResult(@NonNull String);
+    method @Deprecated @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int[] supplyPinReportResult(String);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean supplyPuk(String, String);
-    method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int[] supplyPukReportResult(String, String);
+    method @Nullable @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public android.telephony.PinResult supplyPukReportPinResult(@NonNull String, @NonNull String);
+    method @Deprecated @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int[] supplyPukReportResult(String, String);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean switchSlots(int[]);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void toggleRadioOnOff();
     method public void updateServiceLocation();
diff --git a/telephony/java/android/telephony/PinResult.java b/telephony/java/android/telephony/PinResult.java
new file mode 100644
index 0000000..683e853
--- /dev/null
+++ b/telephony/java/android/telephony/PinResult.java
@@ -0,0 +1,173 @@
+/*
+ * 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 android.telephony;
+
+import android.annotation.IntDef;
+import android.annotation.NonNull;
+import android.annotation.Nullable;
+import android.annotation.SystemApi;
+import android.os.Parcel;
+import android.os.Parcelable;
+
+import com.android.internal.telephony.PhoneConstants;
+
+import java.util.Objects;
+
+/**
+ * Holds the result from a pin attempt.
+ *
+ * @hide
+ */
+@SystemApi
+public final class PinResult implements Parcelable {
+    /** @hide */
+    @IntDef({
+            PIN_RESULT_TYPE_SUCCESS,
+            PIN_RESULT_TYPE_INCORRECT,
+            PIN_RESULT_TYPE_FAILURE,
+    })
+    public @interface PinResultType {}
+
+    /**
+     * Indicates that the pin attempt was a success.
+     */
+    public static final int PIN_RESULT_TYPE_SUCCESS = PhoneConstants.PIN_RESULT_SUCCESS;
+
+    /**
+     * Indicates that the pin attempt was incorrect.
+     */
+    public static final int PIN_RESULT_TYPE_INCORRECT = PhoneConstants.PIN_PASSWORD_INCORRECT;
+
+    /**
+     * Indicates that the pin attempt was a failure.
+     */
+    public static final int PIN_RESULT_TYPE_FAILURE = PhoneConstants.PIN_GENERAL_FAILURE;
+
+    private static final PinResult sFailedResult =
+            new PinResult(PinResult.PIN_RESULT_TYPE_FAILURE, -1);
+
+    private final @PinResultType int mType;
+
+    private final int mAttemptsRemaining;
+
+    /**
+     * Returns either success, incorrect or failure.
+     *
+     * @see: #PIN_RESULT_TYPE_SUCCESS
+     * @see: #PIN_RESULT_TYPE_INCORRECT
+     * @see: #PIN_RESULT_TYPE_FAILURE
+     * @return The result type of the pin attempt.
+     */
+    public @PinResultType int getType() {
+        return mType;
+    }
+
+    /**
+     * The number of pin attempts remaining.
+     *
+     * @return Number of attempts remaining.
+     */
+    public int getAttemptsRemaining() {
+        return mAttemptsRemaining;
+    }
+
+    @NonNull
+    public static PinResult getDefaultFailedResult() {
+        return sFailedResult;
+    }
+
+    /**
+     * PinResult constructor
+     *
+     * @param type The type of pin result.
+     * @see: #PIN_RESULT_TYPE_SUCCESS
+     * @see: #PIN_RESULT_TYPE_INCORRECT
+     * @see: #PIN_RESULT_TYPE_FAILURE
+     * @param attemptsRemaining Number of pin attempts remaining.
+     */
+    public PinResult(@PinResultType int type, int attemptsRemaining) {
+        mType = type;
+        mAttemptsRemaining = attemptsRemaining;
+    }
+
+    /**
+     * Construct a PinResult object from the given parcel.
+     *
+     * @hide
+     */
+    private PinResult(Parcel in) {
+        mType = in.readInt();
+        mAttemptsRemaining = in.readInt();
+    }
+
+    /**
+     * String representation of the Pin Result.
+     */
+    @NonNull
+    @Override
+    public String toString() {
+        return "type: " + getType() + ", attempts remaining: " + getAttemptsRemaining();
+    }
+
+    /**
+     * Required to be Parcelable
+     */
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    /**
+     * Required to be Parcelable
+     */
+    @Override
+    public void writeToParcel(@NonNull Parcel out, int flags) {
+        out.writeInt(mType);
+        out.writeInt(mAttemptsRemaining);
+    }
+
+    /** Required to be Parcelable */
+    public static final @NonNull Parcelable.Creator<PinResult> CREATOR = new Creator<PinResult>() {
+        public PinResult createFromParcel(Parcel in) {
+            return new PinResult(in);
+        }
+        public PinResult[] newArray(int size) {
+            return new PinResult[size];
+        }
+    };
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(mAttemptsRemaining, mType);
+    }
+
+    @Override
+    public boolean equals(@Nullable Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null) {
+            return false;
+        }
+        if (getClass() != obj.getClass()) {
+            return false;
+        }
+        PinResult other = (PinResult) obj;
+        return (mType == other.mType
+                && mAttemptsRemaining == other.mAttemptsRemaining);
+    }
+}
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index dd5c065..79b715c 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -8547,9 +8547,13 @@
         return false;
     }
 
-    /** @hide */
+    /**
+     * @deprecated use {@link #supplyPinReportPinResult(String pin)} instead.
+     *
+     * @hide */
     @SystemApi
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
+    @Deprecated
     public int[] supplyPinReportResult(String pin) {
         try {
             ITelephony telephony = getITelephony();
@@ -8561,9 +8565,13 @@
         return new int[0];
     }
 
-    /** @hide */
+    /**
+     * @deprecated use {@link #supplyPukReportPinResult(String puk, String pin)} instead.
+     *
+     * @hide */
     @SystemApi
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
+    @Deprecated
     public int[] supplyPukReportResult(String puk, String pin) {
         try {
             ITelephony telephony = getITelephony();
@@ -8576,6 +8584,55 @@
     }
 
     /**
+     * Used when the user attempts to enter their pin.
+     *
+     * @param pin The user entered pin.
+     * @return The result of the pin.
+     *
+     * @hide
+     */
+    @SystemApi
+    @Nullable
+    @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
+    public PinResult supplyPinReportPinResult(@NonNull String pin) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                int[] result = telephony.supplyPinReportResultForSubscriber(getSubId(), pin);
+                return new PinResult(result[0], result[1]);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error calling ITelephony#supplyPinReportResultForSubscriber", e);
+        }
+        return null;
+    }
+
+    /**
+     * Used when the user attempts to enter the puk or their pin.
+     *
+     * @param puk The product unblocking key.
+     * @param pin The user entered pin.
+     * @return The result of the pin.
+     *
+     * @hide
+     */
+    @SystemApi
+    @Nullable
+    @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
+    public PinResult supplyPukReportPinResult(@NonNull String puk, @NonNull String pin) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                int[] result = telephony.supplyPukReportResultForSubscriber(getSubId(), puk, pin);
+                return new PinResult(result[0], result[1]);
+            }
+        } catch (RemoteException e) {
+            Log.e(TAG, "Error calling ITelephony#]", e);
+        }
+        return null;
+    }
+
+    /**
      * Used to notify callers of
      * {@link TelephonyManager#sendUssdRequest(String, UssdResponseCallback, Handler)} when the
      * network either successfully executes a USSD request, or if there was a failure while