Add apn data structure

This add a data structure to store the apn data locally.

Test: no test
Bug: 73745458
Bug: 67327863
Change-Id: Iae56583ab1c99f57154461c71a10b74db87ab1bd

src/com/android/settings/ApnEditor.java

@@ -47,12 +47,12 @@ import android.view.MenuItem;
 import android.view.View;
 import android.view.View.OnKeyListener;
 
+import com.android.internal.annotations.VisibleForTesting;
 import com.android.internal.logging.nano.MetricsProto.MetricsEvent;
 import com.android.settings.core.instrumentation.InstrumentedDialogFragment;
 import com.android.internal.telephony.PhoneConstants;
 import com.android.internal.util.ArrayUtils;
 
-import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
@@ -61,6 +61,9 @@ import java.util.Set;
 import static android.app.Activity.RESULT_OK;
 import static android.content.Context.TELEPHONY_SERVICE;
 
+/**
+ * TODO: After loading all changes, please move this to network package.
+ */
 public class ApnEditor extends SettingsPreferenceFragment
         implements OnPreferenceChangeListener, OnKeyListener {
 
@@ -1188,4 +1191,86 @@ public class ApnEditor extends SettingsPreferenceFragment
         }
     }
 
+    public static class InvalidTypeException extends RuntimeException {
+        InvalidTypeException(String msg) {
+            super(msg);
+        }
+    }
+
+    @VisibleForTesting
+    static class ApnData {
+        /**
+         * The uri correspond to a database row of the apn data. This should be null if the apn
+         * is not in the database.
+         */
+        Uri mUri;
+
+        /** Each element correspond to a column of the database row. */
+        Object[] mData;
+
+        ApnData(int numberOfField) {
+            mData = new Object[numberOfField];
+        }
+
+        ApnData(Uri uri, Cursor cursor) {
+            mUri = uri;
+            mData = new Object[cursor.getColumnCount()];
+            for (int i = 0; i < mData.length; i++) {
+                switch (cursor.getType(i)) {
+                    case Cursor.FIELD_TYPE_FLOAT:
+                        mData[i] = cursor.getFloat(i);
+                        break;
+                    case Cursor.FIELD_TYPE_INTEGER:
+                        mData[i] = cursor.getInt(i);
+                        break;
+                    case Cursor.FIELD_TYPE_STRING:
+                        mData[i] = cursor.getString(i);
+                        break;
+                    case Cursor.FIELD_TYPE_BLOB:
+                        mData[i] = cursor.getBlob(i);
+                        break;
+                    default:
+                        mData[i] = null;
+                }
+            }
+        }
+
+        Uri getUri() {
+            return mUri;
+        }
+
+        void setUri(Uri uri) {
+            mUri = uri;
+        }
+
+        Integer getInteger(int index) throws InvalidTypeException {
+            if (!isValidTypeOrNull(mData[index], Integer.class)) {
+                throwInvalidTypeException(Integer.class, mData[index].getClass());
+            }
+            return (Integer) mData[index];
+        }
+
+        Integer getInteger(int index, Integer defaultValue) throws InvalidTypeException {
+            Integer val = getInteger(index);
+            return val == null ? defaultValue : val;
+        }
+
+        String getString(int index) throws InvalidTypeException {
+            if (!isValidTypeOrNull(mData[index], String.class)) {
+                throwInvalidTypeException(String.class, mData[index].getClass());
+            }
+            return (String) mData[index];
+        }
+
+        private boolean isValidTypeOrNull(Object obj, Class expectedClass) {
+            return obj == null || expectedClass.isInstance(obj);
+        }
+
+        private void throwInvalidTypeException(Class<?> expectedClass, Class<?> actualClass) {
+            throw new InvalidTypeException(
+                    String.format(
+                            "Type mismatched, want %s, but is %s", expectedClass, actualClass));
+        }
+    }
+
 }

tests/robotests/src/com/android/settings/ApnEditorTest.java

@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2018 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;
+
+import static junit.framework.Assert.assertEquals;
+import static junit.framework.Assert.assertNull;
+
+import static org.mockito.Mockito.doReturn;
+
+import android.database.Cursor;
+import android.net.Uri;
+
+import com.android.settings.ApnEditor.ApnData;
+import com.android.settings.ApnEditor.InvalidTypeException;
+import com.android.settings.testutils.SettingsRobolectricTestRunner;
+
+import org.junit.Before;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.MockitoAnnotations;
+
+@RunWith(SettingsRobolectricTestRunner.class)
+public class ApnEditorTest {
+
+    private static final int CURSOR_INTEGER_INDEX = 0;
+    private static final int CURSOR_STRING_INDEX = 1;
+
+    private static final Uri mApnUri = Uri.parse("Apn://row/1");
+
+    @Mock
+    private Cursor mCursor;
+
+    @Before
+    public void setUp() {
+        MockitoAnnotations.initMocks(this);
+        initCursor();
+    }
+
+    private void initCursor() {
+        doReturn(2).when(mCursor).getColumnCount();
+        doReturn(Integer.valueOf(2)).when(mCursor).getInt(CURSOR_INTEGER_INDEX);
+        doReturn("str").when(mCursor).getString(CURSOR_STRING_INDEX);
+        doReturn(Cursor.FIELD_TYPE_INTEGER).when(mCursor).getType(CURSOR_INTEGER_INDEX);
+        doReturn(Cursor.FIELD_TYPE_STRING).when(mCursor).getType(CURSOR_STRING_INDEX);
+    }
+
+    @Test(expected = InvalidTypeException.class)
+    public void testApnData_invalidIntegerType_throwsInvalidTypeException() {
+        // GIVEN a ApnData constructed from cursor
+        ApnData data = new ApnData(mApnUri, mCursor);
+
+        // WHEN get a string from an integer column
+        // THEN the InvalidTypeException is threw
+        data.getString(CURSOR_INTEGER_INDEX);
+    }
+
+    @Test(expected = InvalidTypeException.class)
+    public void testApnData_invalidStringType_throwsInvalidTypeException() {
+        // GIVEN a ApnData constructed from cursor
+        ApnData data = new ApnData(mApnUri, mCursor);
+
+        // WHEN get a integer from a string column
+        // THEN the InvalidTypeException is threw
+        data.getInteger(CURSOR_STRING_INDEX);
+    }
+
+    @Test
+    public void testApnData_validIntegerType_returnCorrectValue() {
+        // GIVEN a ApnData constructed from cursor
+        ApnData data = new ApnData(mApnUri, mCursor);
+
+        // WHEN get integer from an integer column
+        int val = data.getInteger(CURSOR_INTEGER_INDEX);
+
+        // THEN the integer is returned correctly
+        assertEquals(mCursor.getInt(CURSOR_INTEGER_INDEX), val);
+    }
+
+    @Test
+    public void testApnData_validStringType_returnCorrectValue() {
+        // GIVEN a ApnData constructed from cursor
+        ApnData data = new ApnData(mApnUri, mCursor);
+
+        // WHEN get string from a string column
+        String str = data.getString(CURSOR_STRING_INDEX);
+
+        // THEN the integer is returned correctly
+        assertEquals(mCursor.getString(CURSOR_STRING_INDEX), str);
+    }
+
+    @Test
+    public void testApnData_nullValueColumn_returnNull() {
+        // GIVEN a empty ApnData
+        ApnData data = new ApnData(3);
+
+        // WHEN get string value from a null column
+        String str = data.getString(0);
+
+        // THEN the null value is returned
+        assertNull(str);
+    }
+}