am 180e484e: am be416248: Merge "Remove persisted stacks when app removed/cleared." into klp-dev

* commit '180e484ef0370ab7f796c8fa51baf6b4c1c2cbdc':
  Remove persisted stacks when app removed/cleared.

3 files changed, 186 insertions, 1 deletions

diff --git a/packages/DocumentsUI/AndroidManifest.xml b/packages/DocumentsUI/AndroidManifest.xml
index 6faf7f8..179bcd1 100644
--- a/packages/DocumentsUI/AndroidManifest.xml
+++ b/packages/DocumentsUI/AndroidManifest.xml
@@ -50,6 +50,14 @@
             android:authorities="com.android.documentsui.recents"
             android:exported="false" />
 
+        <receiver android:name=".PackageReceiver">
+            <intent-filter>
+                <action android:name="android.intent.action.PACKAGE_FULLY_REMOVED" />
+                <action android:name="android.intent.action.PACKAGE_DATA_CLEARED" />
+                <data android:scheme="package" />
+            </intent-filter>
+        </receiver>
+
         <!-- TODO: remove when we have real clients -->
         <activity android:name=".TestActivity" android:enabled="false">
             <intent-filter>
diff --git a/packages/DocumentsUI/src/com/android/documentsui/PackageReceiver.java b/packages/DocumentsUI/src/com/android/documentsui/PackageReceiver.java
new file mode 100644
index 0000000..aef63af
--- /dev/null
+++ b/packages/DocumentsUI/src/com/android/documentsui/PackageReceiver.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2013 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.documentsui;
+
+import android.content.BroadcastReceiver;
+import android.content.ContentResolver;
+import android.content.Context;
+import android.content.Intent;
+import android.net.Uri;
+
+/**
+ * Clean up {@link RecentsProvider} when packages are removed.
+ */
+public class PackageReceiver extends BroadcastReceiver {
+    @Override
+    public void onReceive(Context context, Intent intent) {
+        final ContentResolver resolver = context.getContentResolver();
+
+        final String action = intent.getAction();
+        if (Intent.ACTION_PACKAGE_FULLY_REMOVED.equals(action)) {
+            resolver.call(RecentsProvider.buildRecent(), RecentsProvider.METHOD_PURGE, null, null);
+
+        } else if (Intent.ACTION_PACKAGE_DATA_CLEARED.equals(action)) {
+            final Uri data = intent.getData();
+            if (data != null) {
+                final String packageName = data.getSchemeSpecificPart();
+                resolver.call(RecentsProvider.buildRecent(), RecentsProvider.METHOD_PURGE_PACKAGE,
+                        packageName, null);
+            }
+        }
+    }
+}
diff --git a/packages/DocumentsUI/src/com/android/documentsui/RecentsProvider.java b/packages/DocumentsUI/src/com/android/documentsui/RecentsProvider.java
index 4313fa7..f6e4349 100644
--- a/packages/DocumentsUI/src/com/android/documentsui/RecentsProvider.java
+++ b/packages/DocumentsUI/src/com/android/documentsui/RecentsProvider.java
@@ -16,24 +16,40 @@
 
 package com.android.documentsui;
 
+import static com.android.documentsui.model.DocumentInfo.getCursorString;
+
 import android.content.ContentProvider;
 import android.content.ContentResolver;
 import android.content.ContentValues;
 import android.content.Context;
+import android.content.Intent;
 import android.content.UriMatcher;
+import android.content.pm.ResolveInfo;
 import android.database.Cursor;
 import android.database.sqlite.SQLiteDatabase;
 import android.database.sqlite.SQLiteOpenHelper;
 import android.net.Uri;
+import android.os.Bundle;
+import android.provider.DocumentsContract;
 import android.provider.DocumentsContract.Document;
 import android.provider.DocumentsContract.Root;
 import android.text.format.DateUtils;
 import android.util.Log;
 
+import com.android.documentsui.model.DocumentStack;
+import com.android.documentsui.model.DurableUtils;
+import com.android.internal.util.Predicate;
+import com.google.android.collect.Sets;
+
+import libcore.io.IoUtils;
+
+import java.io.IOException;
+import java.util.Set;
+
 public class RecentsProvider extends ContentProvider {
     private static final String TAG = "RecentsProvider";
 
-    public static final long MAX_HISTORY_IN_MILLIS = 45 * DateUtils.DAY_IN_MILLIS;
+    private static final long MAX_HISTORY_IN_MILLIS = 45 * DateUtils.DAY_IN_MILLIS;
 
     private static final String AUTHORITY = "com.android.documentsui.recents";
 
@@ -43,6 +59,9 @@ public class RecentsProvider extends ContentProvider {
     private static final int URI_STATE = 2;
     private static final int URI_RESUME = 3;
 
+    public static final String METHOD_PURGE = "purge";
+    public static final String METHOD_PURGE_PACKAGE = "purgePackage";
+
     static {
         sMatcher.addURI(AUTHORITY, "recent", URI_RECENT);
         // state/authority/rootId/docId
@@ -231,4 +250,116 @@ public class RecentsProvider extends ContentProvider {
     public int delete(Uri uri, String selection, String[] selectionArgs) {
         throw new UnsupportedOperationException("Unsupported Uri " + uri);
     }
+
+    @Override
+    public Bundle call(String method, String arg, Bundle extras) {
+        if (METHOD_PURGE.equals(method)) {
+            // Purge references to unknown authorities
+            final Intent intent = new Intent(DocumentsContract.PROVIDER_INTERFACE);
+            final Set<String> knownAuth = Sets.newHashSet();
+            for (ResolveInfo info : getContext()
+                    .getPackageManager().queryIntentContentProviders(intent, 0)) {
+                knownAuth.add(info.providerInfo.authority);
+            }
+
+            purgeByAuthority(new Predicate<String>() {
+                @Override
+                public boolean apply(String authority) {
+                    // Purge unknown authorities
+                    return !knownAuth.contains(authority);
+                }
+            });
+
+            return null;
+
+        } else if (METHOD_PURGE_PACKAGE.equals(method)) {
+            // Purge references to authorities in given package
+            final Intent intent = new Intent(DocumentsContract.PROVIDER_INTERFACE);
+            intent.setPackage(arg);
+            final Set<String> packageAuth = Sets.newHashSet();
+            for (ResolveInfo info : getContext()
+                    .getPackageManager().queryIntentContentProviders(intent, 0)) {
+                packageAuth.add(info.providerInfo.authority);
+            }
+
+            if (!packageAuth.isEmpty()) {
+                purgeByAuthority(new Predicate<String>() {
+                    @Override
+                    public boolean apply(String authority) {
+                        // Purge authority matches
+                        return packageAuth.contains(authority);
+                    }
+                });
+            }
+
+            return null;
+
+        } else {
+            return super.call(method, arg, extras);
+        }
+    }
+
+    /**
+     * Purge all internal data whose authority matches the given
+     * {@link Predicate}.
+     */
+    private void purgeByAuthority(Predicate<String> predicate) {
+        final SQLiteDatabase db = mHelper.getWritableDatabase();
+        final DocumentStack stack = new DocumentStack();
+
+        Cursor cursor = db.query(TABLE_RECENT, null, null, null, null, null, null);
+        try {
+            while (cursor.moveToNext()) {
+                try {
+                    final byte[] rawStack = cursor.getBlob(
+                            cursor.getColumnIndex(RecentColumns.STACK));
+                    DurableUtils.readFromArray(rawStack, stack);
+
+                    if (stack.root != null && predicate.apply(stack.root.authority)) {
+                        final String key = getCursorString(cursor, RecentColumns.KEY);
+                        db.delete(TABLE_RECENT, RecentColumns.KEY + "=?", new String[] { key });
+                    }
+                } catch (IOException ignored) {
+                }
+            }
+        } finally {
+            IoUtils.closeQuietly(cursor);
+        }
+
+        cursor = db.query(TABLE_STATE, new String[] {
+                StateColumns.AUTHORITY }, null, null, StateColumns.AUTHORITY, null, null);
+        try {
+            while (cursor.moveToNext()) {
+                final String authority = getCursorString(cursor, StateColumns.AUTHORITY);
+                if (predicate.apply(authority)) {
+                    db.delete(TABLE_STATE, StateColumns.AUTHORITY + "=?", new String[] {
+                            authority });
+                    Log.d(TAG, "Purged state for " + authority);
+                }
+            }
+        } finally {
+            IoUtils.closeQuietly(cursor);
+        }
+
+        cursor = db.query(TABLE_RESUME, null, null, null, null, null, null);
+        try {
+            while (cursor.moveToNext()) {
+                try {
+                    final byte[] rawStack = cursor.getBlob(
+                            cursor.getColumnIndex(ResumeColumns.STACK));
+                    DurableUtils.readFromArray(rawStack, stack);
+
+                    if (stack.root != null && predicate.apply(stack.root.authority)) {
+                        final String packageName = getCursorString(
+                                cursor, ResumeColumns.PACKAGE_NAME);
+                        db.delete(TABLE_RESUME, ResumeColumns.PACKAGE_NAME + "=?",
+                                new String[] { packageName });
+                    }
+                } catch (IOException ignored) {
+                }
+            }
+        } finally {
+            IoUtils.closeQuietly(cursor);
+        }
+    }
 }