Revert "Move dream metadata parsing to framework."

This reverts commit b0a0bfdf101ab5a61095db89c10804e8bb7691a8.

Reason for revert: Broken Build 8144432 on git_master on errorprone - b/217651561

Change-Id: I3fc1e66747d456a2ffb9a3ab5e6ab10e3bdaef67
diff --git a/core/java/android/service/dreams/DreamService.java b/core/java/android/service/dreams/DreamService.java
index d27bc9b..bb1f393 100644
--- a/core/java/android/service/dreams/DreamService.java
+++ b/core/java/android/service/dreams/DreamService.java
@@ -31,12 +31,6 @@
 import android.content.Context;
 import android.content.Intent;
 import android.content.ServiceConnection;
-import android.content.pm.PackageManager;
-import android.content.pm.ServiceInfo;
-import android.content.res.Resources;
-import android.content.res.TypedArray;
-import android.content.res.XmlResourceParser;
-import android.graphics.drawable.Drawable;
 import android.os.Build;
 import android.os.Handler;
 import android.os.IBinder;
@@ -45,11 +39,9 @@
 import android.os.PowerManager;
 import android.os.RemoteException;
 import android.os.ServiceManager;
-import android.util.AttributeSet;
 import android.util.Log;
 import android.util.MathUtils;
 import android.util.Slog;
-import android.util.Xml;
 import android.view.ActionMode;
 import android.view.Display;
 import android.view.KeyEvent;
@@ -67,11 +59,7 @@
 
 import com.android.internal.util.DumpUtils;
 
-import org.xmlpull.v1.XmlPullParser;
-import org.xmlpull.v1.XmlPullParserException;
-
 import java.io.FileDescriptor;
-import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.ArrayDeque;
 import java.util.function.Consumer;
@@ -171,9 +159,8 @@
  * </pre>
  */
 public class DreamService extends Service implements Window.Callback {
-    private static final String TAG = DreamService.class.getSimpleName();
-    private final String mTag = TAG + "[" + getClass().getSimpleName() + "]";
-    private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
+    private final String mTag =
+            DreamService.class.getSimpleName() + "[" + getClass().getSimpleName() + "]";
 
     /**
      * The name of the dream manager service.
@@ -204,11 +191,6 @@
     public static final String DREAM_META_DATA = "android.service.dream";
 
     /**
-     * Name of the root tag under which a Dream defines its metadata in an XML file.
-     */
-    private static final String DREAM_META_DATA_ROOT_TAG = "dream";
-
-    /**
      * Extra containing a boolean for whether to show complications on the overlay.
      * @hide
      */
@@ -1099,82 +1081,6 @@
     // end public api
 
     /**
-     * Parses and returns metadata of the dream service indicated by the service info. Returns null
-     * if metadata cannot be found.
-     *
-     * Note that {@link ServiceInfo} must be fetched with {@link PackageManager#GET_META_DATA} flag.
-     *
-     * @hide
-     */
-    @Nullable
-    public static DreamMetadata getDreamMetadata(Context context, ServiceInfo serviceInfo) {
-        final PackageManager pm = context.getPackageManager();
-
-        final TypedArray rawMetadata = readMetadata(pm, serviceInfo);
-        if (rawMetadata == null) return null;
-
-        final DreamMetadata metadata = new DreamMetadata(
-                convertToComponentName(rawMetadata.getString(
-                        com.android.internal.R.styleable.Dream_settingsActivity), serviceInfo),
-                rawMetadata.getDrawable(
-                        com.android.internal.R.styleable.Dream_previewImage));
-        rawMetadata.recycle();
-        return metadata;
-    }
-
-    /**
-     * Returns the raw XML metadata fetched from the ${@link ServiceInfo}.
-     *
-     * Returns <code>null</code> if the ${@link ServiceInfo} doesn't contain valid dream metadata.
-     */
-    @Nullable
-    private static TypedArray readMetadata(PackageManager pm, ServiceInfo serviceInfo) {
-        if (serviceInfo == null || serviceInfo.metaData == null) {
-            return null;
-        }
-
-        try (XmlResourceParser parser =
-                     serviceInfo.loadXmlMetaData(pm, DreamService.DREAM_META_DATA)) {
-            if (parser == null) {
-                if (DEBUG) Log.w(TAG, "No " + DreamService.DREAM_META_DATA + " metadata");
-                return null;
-            }
-
-            final Resources res = pm.getResourcesForApplication(serviceInfo.applicationInfo);
-            final AttributeSet attrs = Xml.asAttributeSet(parser);
-            while (true) {
-                final int type = parser.next();
-                if (type == XmlPullParser.END_DOCUMENT || type == XmlPullParser.START_TAG) {
-                    break;
-                }
-            }
-
-            if (!parser.getName().equals(DREAM_META_DATA_ROOT_TAG)) {
-                if (DEBUG) {
-                    Log.w(TAG, "Metadata does not start with " + DREAM_META_DATA_ROOT_TAG + " tag");
-                }
-                return null;
-            }
-
-            return res.obtainAttributes(attrs, com.android.internal.R.styleable.Dream);
-        } catch (PackageManager.NameNotFoundException | IOException | XmlPullParserException e) {
-            if (DEBUG) Log.e(TAG, "Error parsing: " + serviceInfo.packageName, e);
-            return null;
-        }
-    }
-
-    private static ComponentName convertToComponentName(String flattenedString,
-            ServiceInfo serviceInfo) {
-        if (flattenedString == null) return null;
-
-        if (!flattenedString.contains("/")) {
-            return new ComponentName(serviceInfo.packageName, flattenedString);
-        }
-
-        return ComponentName.unflattenFromString(flattenedString);
-    }
-
-    /**
      * Called by DreamController.stopDream() when the Dream is about to be unbound and destroyed.
      *
      * Must run on mHandler.
@@ -1396,22 +1302,4 @@
             onWindowCreated(a.getWindow());
         }
     }
-
-    /**
-     * Represents metadata defined in {@link android.R.styleable#Dream &lt;dream&gt;}.
-     *
-     * @hide
-     */
-    public static final class DreamMetadata {
-        @Nullable
-        public final ComponentName settingsActivity;
-
-        @Nullable
-        public final Drawable previewImage;
-
-        DreamMetadata(ComponentName settingsActivity, Drawable previewImage) {
-            this.settingsActivity = settingsActivity;
-            this.previewImage = previewImage;
-        }
-    }
 }
diff --git a/packages/SettingsLib/src/com/android/settingslib/dream/DreamBackend.java b/packages/SettingsLib/src/com/android/settingslib/dream/DreamBackend.java
index 98a3386..6bf43e5 100644
--- a/packages/SettingsLib/src/com/android/settingslib/dream/DreamBackend.java
+++ b/packages/SettingsLib/src/com/android/settingslib/dream/DreamBackend.java
@@ -26,6 +26,8 @@
 import android.content.pm.ResolveInfo;
 import android.content.pm.ServiceInfo;
 import android.content.res.Resources;
+import android.content.res.TypedArray;
+import android.content.res.XmlResourceParser;
 import android.graphics.drawable.Drawable;
 import android.os.RemoteException;
 import android.os.ServiceManager;
@@ -33,14 +35,21 @@
 import android.service.dreams.DreamService;
 import android.service.dreams.IDreamManager;
 import android.text.TextUtils;
+import android.util.AttributeSet;
 import android.util.Log;
+import android.util.Xml;
 
 import com.android.settingslib.R;
 
+import org.xmlpull.v1.XmlPullParser;
+import org.xmlpull.v1.XmlPullParserException;
+
+import java.io.IOException;
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
 import java.util.ArrayList;
 import java.util.Arrays;
+import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashSet;
 import java.util.List;
@@ -161,7 +170,7 @@
         PackageManager pm = mContext.getPackageManager();
         Intent dreamIntent = new Intent(DreamService.SERVICE_INTERFACE);
         List<ResolveInfo> resolveInfos = pm.queryIntentServices(dreamIntent,
-                PackageManager.ResolveInfoFlags.of(PackageManager.GET_META_DATA));
+                PackageManager.GET_META_DATA);
         List<DreamInfo> dreamInfos = new ArrayList<>(resolveInfos.size());
         for (ResolveInfo resolveInfo : resolveInfos) {
             final ComponentName componentName = getDreamComponentName(resolveInfo);
@@ -176,18 +185,15 @@
             dreamInfo.componentName = componentName;
             dreamInfo.isActive = dreamInfo.componentName.equals(activeDream);
 
-            final DreamService.DreamMetadata dreamMetadata = DreamService.getDreamMetadata(mContext,
-                    resolveInfo.serviceInfo);
-            if (dreamMetadata != null) {
-                dreamInfo.settingsComponentName = dreamMetadata.settingsActivity;
-                dreamInfo.previewImage = dreamMetadata.previewImage;
-            }
+            final DreamMetadata dreamMetadata = getDreamMetadata(pm, resolveInfo);
+            dreamInfo.settingsComponentName = dreamMetadata.mSettingsActivity;
+            dreamInfo.previewImage = dreamMetadata.mPreviewImage;
             if (dreamInfo.previewImage == null) {
                 dreamInfo.previewImage = mDreamPreviewDefault;
             }
             dreamInfos.add(dreamInfo);
         }
-        dreamInfos.sort(mComparator);
+        Collections.sort(dreamInfos, mComparator);
         return dreamInfos;
     }
 
@@ -477,6 +483,67 @@
         return new ComponentName(resolveInfo.serviceInfo.packageName, resolveInfo.serviceInfo.name);
     }
 
+    private static final class DreamMetadata {
+        @Nullable
+        Drawable mPreviewImage;
+        @Nullable
+        ComponentName mSettingsActivity;
+    }
+
+    @Nullable
+    private static TypedArray readMetadata(PackageManager pm, ServiceInfo serviceInfo) {
+        if (serviceInfo == null || serviceInfo.metaData == null) {
+            return null;
+        }
+        try (XmlResourceParser parser =
+                     serviceInfo.loadXmlMetaData(pm, DreamService.DREAM_META_DATA)) {
+            if (parser == null) {
+                Log.w(TAG, "No " + DreamService.DREAM_META_DATA + " meta-data");
+                return null;
+            }
+            Resources res = pm.getResourcesForApplication(serviceInfo.applicationInfo);
+            AttributeSet attrs = Xml.asAttributeSet(parser);
+            while (true) {
+                final int type = parser.next();
+                if (type == XmlPullParser.END_DOCUMENT || type == XmlPullParser.START_TAG) {
+                    break;
+                }
+            }
+            String nodeName = parser.getName();
+            if (!"dream".equals(nodeName)) {
+                Log.w(TAG, "Meta-data does not start with dream tag");
+                return null;
+            }
+            return res.obtainAttributes(attrs, com.android.internal.R.styleable.Dream);
+        } catch (PackageManager.NameNotFoundException | IOException | XmlPullParserException e) {
+            Log.w(TAG, "Error parsing : " + serviceInfo.packageName, e);
+            return null;
+        }
+    }
+
+    private static ComponentName convertToComponentName(String flattenedString,
+            ServiceInfo serviceInfo) {
+        if (flattenedString == null) return null;
+
+        if (flattenedString.indexOf('/') < 0) {
+            flattenedString = serviceInfo.packageName + "/" + flattenedString;
+        }
+        return ComponentName.unflattenFromString(flattenedString);
+    }
+
+    private static DreamMetadata getDreamMetadata(PackageManager pm, ResolveInfo resolveInfo) {
+        DreamMetadata result = new DreamMetadata();
+        if (resolveInfo == null) return result;
+        TypedArray rawMetadata = readMetadata(pm, resolveInfo.serviceInfo);
+        if (rawMetadata == null) return result;
+        result.mSettingsActivity = convertToComponentName(rawMetadata.getString(
+                com.android.internal.R.styleable.Dream_settingsActivity), resolveInfo.serviceInfo);
+        result.mPreviewImage = rawMetadata.getDrawable(
+                com.android.internal.R.styleable.Dream_previewImage);
+        rawMetadata.recycle();
+        return result;
+    }
+
     private static void logd(String msg, Object... args) {
         if (DEBUG) {
             Log.d(TAG, args == null || args.length == 0 ? msg : String.format(msg, args));
diff --git a/services/tests/servicestests/AndroidManifest.xml b/services/tests/servicestests/AndroidManifest.xml
index 53cab9e..d9f73d9 100644
--- a/services/tests/servicestests/AndroidManifest.xml
+++ b/services/tests/servicestests/AndroidManifest.xml
@@ -130,19 +130,6 @@
                android:resource="@xml/test_account_type2_authenticator"/>
         </service>
 
-        <service
-            android:name="com.android.server.dreams.TestDreamService"
-            android:exported="false"
-            android:label="Test Dream" >
-            <intent-filter>
-                <action android:name="android.service.dreams.DreamService" />
-                <category android:name="android.intent.category.DEFAULT" />
-            </intent-filter>
-            <meta-data
-                android:name="android.service.dream"
-                android:resource="@xml/test_dream_metadata" />
-        </service>
-
         <receiver android:name="com.android.server.devicepolicy.ApplicationRestrictionsTest$AdminReceiver"
              android:permission="android.permission.BIND_DEVICE_ADMIN"
              android:exported="true">
diff --git a/services/tests/servicestests/res/xml/test_dream_metadata.xml b/services/tests/servicestests/res/xml/test_dream_metadata.xml
deleted file mode 100644
index 8d76591..0000000
--- a/services/tests/servicestests/res/xml/test_dream_metadata.xml
+++ /dev/null
@@ -1,18 +0,0 @@
-<!--
-  ~ Copyright (C) 2022 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.
-  -->
-
-<dream xmlns:android="http://schemas.android.com/apk/res/android"
-       android:settingsActivity="com.android.server.dreams/.TestDreamSettingsActivity" />
diff --git a/services/tests/servicestests/src/com/android/server/dreams/DreamServiceTest.java b/services/tests/servicestests/src/com/android/server/dreams/DreamServiceTest.java
deleted file mode 100644
index 305d6f4..0000000
--- a/services/tests/servicestests/src/com/android/server/dreams/DreamServiceTest.java
+++ /dev/null
@@ -1,56 +0,0 @@
-/*
- * Copyright (C) 2022 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.server.dreams;
-
-import static org.junit.Assert.assertEquals;
-
-import android.content.ComponentName;
-import android.content.Context;
-import android.content.pm.PackageManager;
-import android.content.pm.ServiceInfo;
-import android.service.dreams.DreamService;
-
-import androidx.test.filters.SmallTest;
-import androidx.test.platform.app.InstrumentationRegistry;
-import androidx.test.runner.AndroidJUnit4;
-
-import org.junit.Test;
-import org.junit.runner.RunWith;
-
-@SmallTest
-@RunWith(AndroidJUnit4.class)
-public class DreamServiceTest {
-    @Test
-    public void testMetadataParsing() {
-        final String testDreamServiceComponent = "com.android.server.dreams/.TestDreamService";
-        final String testSettingsActivity = "com.android.server.dreams/.TestDreamSettingsActivity";
-
-        final Context context = InstrumentationRegistry.getInstrumentation().getTargetContext();
-
-        try {
-            final ServiceInfo si = context.getPackageManager().getServiceInfo(
-                    ComponentName.unflattenFromString(testDreamServiceComponent),
-                    PackageManager.ComponentInfoFlags.of(PackageManager.GET_META_DATA));
-            final DreamService.DreamMetadata metadata = DreamService.getDreamMetadata(context, si);
-
-            assertEquals(0, metadata.settingsActivity.compareTo(
-                    ComponentName.unflattenFromString(testSettingsActivity)));
-        } catch (PackageManager.NameNotFoundException e) {
-            e.printStackTrace();
-        }
-    }
-}
diff --git a/services/tests/servicestests/src/com/android/server/dreams/TestDreamService.java b/services/tests/servicestests/src/com/android/server/dreams/TestDreamService.java
deleted file mode 100644
index 3c99a98..0000000
--- a/services/tests/servicestests/src/com/android/server/dreams/TestDreamService.java
+++ /dev/null
@@ -1,25 +0,0 @@
-/*
- * Copyright (C) 2022 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.server.dreams;
-
-import android.service.dreams.DreamService;
-
-/**
- * Dream service implementation for unit testing.
- */
-public class TestDreamService extends DreamService {
-}