Rename StringNetworkSpecifier to Ethernet

Tests just need a specifier to verify general NetworkSpecifier
functionality. They can use EthernetNetworkSpecifier the same way they
use StringNetworkSpecifier.

To keep the tests passing on Q and R, add a CompatUtil class that will
keep creating StringNetworkSpecifiers (now removed) instead.

Bug: 179329291
Test: atest CtsNetTestCases
Ignore-AOSP-First: Must be merged manually downstream first
Change-Id: Ic6bf611ba36b555e4e0bb1bd3fa0053fe29dc8cf

tests/cts/net/src/android/net/cts/ConnectivityManagerTest.java

@@ -85,7 +85,6 @@ import android.net.NetworkInfo.State;
 import android.net.NetworkRequest;
 import android.net.NetworkUtils;
 import android.net.SocketKeepalive;
-import android.net.StringNetworkSpecifier;
 import android.net.TestNetworkInterface;
 import android.net.TestNetworkManager;
 import android.net.cts.util.CtsNetUtils;
@@ -113,6 +112,7 @@ import com.android.modules.utils.build.SdkLevel;
 import com.android.networkstack.apishim.ConnectivityManagerShimImpl;
 import com.android.networkstack.apishim.ConstantsShim;
 import com.android.networkstack.apishim.common.ConnectivityManagerShim;
+import com.android.testutils.CompatUtil;
 import com.android.testutils.DevSdkIgnoreRule;
 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo;
 import com.android.testutils.RecorderCallback.CallbackEntry;
@@ -1597,8 +1597,8 @@ public class ConnectivityManagerTest {
                 // Test networks do not have NOT_VPN or TRUSTED capabilities by default
                 .removeCapability(NetworkCapabilities.NET_CAPABILITY_NOT_VPN)
                 .removeCapability(NetworkCapabilities.NET_CAPABILITY_TRUSTED)
-                .setNetworkSpecifier(
+                .setNetworkSpecifier(CompatUtil.makeTestNetworkSpecifier(
-                        new StringNetworkSpecifier(testNetworkInterface.getInterfaceName()))
+                        testNetworkInterface.getInterfaceName()))
                 .build();
 
         // Verify background network cannot be requested without NETWORK_SETTINGS permission.

tests/cts/net/src/android/net/cts/NetworkAgentTest.kt

@@ -46,7 +46,6 @@ import android.net.NetworkProvider
 import android.net.NetworkRequest
 import android.net.RouteInfo
 import android.net.SocketKeepalive
-import android.net.StringNetworkSpecifier
 import android.net.Uri
 import android.net.VpnManager
 import android.net.VpnTransportInfo
@@ -70,6 +69,7 @@ import com.android.connectivity.aidl.INetworkAgent
 import com.android.connectivity.aidl.INetworkAgentRegistry
 import com.android.modules.utils.build.SdkLevel
 import com.android.net.module.util.ArrayTrackRecord
+import com.android.testutils.CompatUtil
 import com.android.testutils.DevSdkIgnoreRule.IgnoreUpTo
 import com.android.testutils.DevSdkIgnoreRunner
 import com.android.testutils.RecorderCallback.CallbackEntry.Available
@@ -218,8 +218,6 @@ class NetworkAgentTest {
             data class OnSignalStrengthThresholdsUpdated(val thresholds: IntArray) : CallbackEntry()
         }
 
-        fun getName(): String? = (nc.getNetworkSpecifier() as? StringNetworkSpecifier)?.specifier
-
         override fun onBandwidthUpdateRequested() {
             history.add(OnBandwidthUpdateRequested)
         }
@@ -327,7 +325,7 @@ class NetworkAgentTest {
                 addCapability(NET_CAPABILITY_NOT_VCN_MANAGED)
             }
             if (null != name) {
-                setNetworkSpecifier(StringNetworkSpecifier(name))
+                setNetworkSpecifier(CompatUtil.makeEthernetNetworkSpecifier(name))
             }
         }
         val lp = initialLp ?: LinkProperties().apply {
@@ -503,12 +501,12 @@ class NetworkAgentTest {
         val request1 = NetworkRequest.Builder()
                 .clearCapabilities()
                 .addTransportType(TRANSPORT_TEST)
-                .setNetworkSpecifier(StringNetworkSpecifier(name1))
+                .setNetworkSpecifier(CompatUtil.makeEthernetNetworkSpecifier(name1))
                 .build()
         val request2 = NetworkRequest.Builder()
                 .clearCapabilities()
                 .addTransportType(TRANSPORT_TEST)
-                .setNetworkSpecifier(StringNetworkSpecifier(name2))
+                .setNetworkSpecifier(CompatUtil.makeEthernetNetworkSpecifier(name2))
                 .build()
         val callback1 = TestableNetworkCallback(timeoutMs = DEFAULT_TIMEOUT_MS)
         val callback2 = TestableNetworkCallback(timeoutMs = DEFAULT_TIMEOUT_MS)