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

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);
+    }
+}