/*
* Copyright (C) 2006 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 android.content;
import android.accounts.Account;
import android.app.ActivityManager;
import android.database.IContentObserver;
import android.database.sqlite.SQLiteException;
import android.net.Uri;
import android.os.Binder;
import android.os.Bundle;
import android.os.IBinder;
import android.os.Parcel;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.UserHandle;
import android.util.Log;
import android.util.SparseIntArray;
import android.Manifest;
import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.security.InvalidParameterException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
/**
* {@hide}
*/
public final class ContentService extends IContentService.Stub {
private static final String TAG = "ContentService";
private Context mContext;
private boolean mFactoryTest;
private final ObserverNode mRootNode = new ObserverNode("");
private SyncManager mSyncManager = null;
private final Object mSyncManagerLock = new Object();
private SyncManager getSyncManager() {
synchronized(mSyncManagerLock) {
try {
// Try to create the SyncManager, return null if it fails (e.g. the disk is full).
if (mSyncManager == null) mSyncManager = new SyncManager(mContext, mFactoryTest);
} catch (SQLiteException e) {
Log.e(TAG, "Can't create SyncManager", e);
}
return mSyncManager;
}
}
@Override
protected synchronized void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.DUMP,
"caller doesn't have the DUMP permission");
// This makes it so that future permission checks will be in the context of this
// process rather than the caller's process. We will restore this before returning.
long identityToken = clearCallingIdentity();
try {
if (mSyncManager == null) {
pw.println("No SyncManager created! (Disk full?)");
} else {
mSyncManager.dump(fd, pw);
}
pw.println();
pw.println("Observer tree:");
synchronized (mRootNode) {
int[] counts = new int[2];
final SparseIntArray pidCounts = new SparseIntArray();
mRootNode.dumpLocked(fd, pw, args, "", " ", counts, pidCounts);
pw.println();
ArrayList<Integer> sorted = new ArrayList<Integer>();
for (int i=0; i<pidCounts.size(); i++) {
sorted.add(pidCounts.keyAt(i));
}
Collections.sort(sorted, new Comparator<Integer>() {
@Override
public int compare(Integer lhs, Integer rhs) {
int lc = pidCounts.get(lhs);
int rc = pidCounts.get(rhs);
if (lc < rc) {
return 1;
} else if (lc > rc) {
return -1;
}
return 0;
}
});
for (int i=0; i<sorted.size(); i++) {
int pid = sorted.get(i);
pw.print(" pid "); pw.print(pid); pw.print(": ");
pw.print(pidCounts.get(pid)); pw.println(" observers");
}
pw.println();
pw.print(" Total number of nodes: "); pw.println(counts[0]);
pw.print(" Total number of observers: "); pw.println(counts[1]);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
@Override
public boolean onTransact(int code, Parcel data, Parcel reply, int flags)
throws RemoteException {
try {
return super.onTransact(code, data, reply, flags);
} catch (RuntimeException e) {
// The content service only throws security exceptions, so let's
// log all others.
if (!(e instanceof SecurityException)) {
Log.e(TAG, "Content Service Crash", e);
}
throw e;
}
}
/*package*/ ContentService(Context context, boolean factoryTest) {
mContext = context;
mFactoryTest = factoryTest;
}
public void systemReady() {
getSyncManager();
}
/**
* Register a content observer tied to a specific user's view of the provider.
* @param userHandle the user whose view of the provider is to be observed. May be
* the calling user without requiring any permission, otherwise the caller needs to
* hold the INTERACT_ACROSS_USERS_FULL permission. Pseudousers USER_ALL and
* USER_CURRENT are properly handled; all other pseudousers are forbidden.
*/
@Override
public void registerContentObserver(Uri uri, boolean notifyForDescendants,
IContentObserver observer, int userHandle) {
if (observer == null || uri == null) {
throw new IllegalArgumentException("You must pass a valid uri and observer");
}
final int callingUser = UserHandle.getCallingUserId();
if (callingUser != userHandle) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.INTERACT_ACROSS_USERS_FULL,
"no permission to observe other users' provider view");
}
if (userHandle < 0) {
if (userHandle == UserHandle.USER_CURRENT) {
userHandle = ActivityManager.getCurrentUser();
} else if (userHandle != UserHandle.USER_ALL) {
throw new InvalidParameterException("Bad user handle for registerContentObserver: "
+ userHandle);
}
}
synchronized (mRootNode) {
mRootNode.addObserverLocked(uri, observer, notifyForDescendants, mRootNode,
Binder.getCallingUid(), Binder.getCallingPid(), userHandle);
if (false) Log.v(TAG, "Registered observer " + observer + " at " + uri +
" with notifyForDescendants " + notifyForDescendants);
}
}
public void registerContentObserver(Uri uri, boolean notifyForDescendants,
IContentObserver observer) {
registerContentObserver(uri, notifyForDescendants, observer,
UserHandle.getCallingUserId());
}
public void unregisterContentObserver(IContentObserver observer) {
if (observer == null) {
throw new IllegalArgumentException("You must pass a valid observer");
}
synchronized (mRootNode) {
mRootNode.removeObserverLocked(observer);
if (false) Log.v(TAG, "Unregistered observer " + observer);
}
}
/**
* Notify observers of a particular user's view of the provider.
* @param userHandle the user whose view of the provider is to be notified. May be
* the calling user without requiring any permission, otherwise the caller needs to
* hold the INTERACT_ACROSS_USERS_FULL permission. Pseudousers USER_ALL and
* USER_CURRENT are properly interpreted; no other pseudousers are allowed.
*/
@Override
public void notifyChange(Uri uri, IContentObserver observer,
boolean observerWantsSelfNotifications, boolean syncToNetwork,
int userHandle) {
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Notifying update of " + uri + " for user " + userHandle
+ " from observer " + observer + ", syncToNetwork " + syncToNetwork);
}
// Notify for any user other than the caller's own requires permission.
final int callingUserHandle = UserHandle.getCallingUserId();
if (userHandle != callingUserHandle) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.INTERACT_ACROSS_USERS_FULL,
"no permission to notify other users");
}
// We passed the permission check; resolve pseudouser targets as appropriate
if (userHandle < 0) {
if (userHandle == UserHandle.USER_CURRENT) {
userHandle = ActivityManager.getCurrentUser();
} else if (userHandle != UserHandle.USER_ALL) {
throw new InvalidParameterException("Bad user handle for notifyChange: "
+ userHandle);
}
}
// This makes it so that future permission checks will be in the context of this
// process rather than the caller's process. We will restore this before returning.
long identityToken = clearCallingIdentity();
try {
ArrayList<ObserverCall> calls = new ArrayList<ObserverCall>();
synchronized (mRootNode) {
mRootNode.collectObserversLocked(uri, 0, observer, observerWantsSelfNotifications,
userHandle, calls);
}
final int numCalls = calls.size();
for (int i=0; i<numCalls; i++) {
ObserverCall oc = calls.get(i);
try {
oc.mObserver.onChange(oc.mSelfChange, uri);
if (Log.isLoggable(TAG, Log.VERBOSE)) {
Log.v(TAG, "Notified " + oc.mObserver + " of " + "update at " + uri);
}
} catch (RemoteException ex) {
synchronized (mRootNode) {
Log.w(TAG, "Found dead observer, removing");
IBinder binder = oc.mObserver.asBinder();
final ArrayList<ObserverNode.ObserverEntry> list
= oc.mNode.mObservers;
int numList = list.size();
for (int j=0; j<numList; j++) {
ObserverNode.ObserverEntry oe = list.get(j);
if (oe.observer.asBinder() == binder) {
list.remove(j);
j--;
numList--;
}
}
}
}
}
if (syncToNetwork) {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.scheduleLocalSync(null /* all accounts */, callingUserHandle,
uri.getAuthority());
}
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public void notifyChange(Uri uri, IContentObserver observer,
boolean observerWantsSelfNotifications, boolean syncToNetwork) {
notifyChange(uri, observer, observerWantsSelfNotifications, syncToNetwork,
UserHandle.getCallingUserId());
}
/**
* Hide this class since it is not part of api,
* but current unittest framework requires it to be public
* @hide
*
*/
public static final class ObserverCall {
final ObserverNode mNode;
final IContentObserver mObserver;
final boolean mSelfChange;
ObserverCall(ObserverNode node, IContentObserver observer, boolean selfChange) {
mNode = node;
mObserver = observer;
mSelfChange = selfChange;
}
}
public void requestSync(Account account, String authority, Bundle extras) {
ContentResolver.validateSyncExtrasBundle(extras);
int userId = UserHandle.getCallingUserId();
// This makes it so that future permission checks will be in the context of this
// process rather than the caller's process. We will restore this before returning.
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.scheduleSync(account, userId, authority, extras, 0 /* no delay */,
false /* onlyThoseWithUnkownSyncableState */);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
/**
* Clear all scheduled sync operations that match the uri and cancel the active sync
* if they match the authority and account, if they are present.
* @param account filter the pending and active syncs to cancel using this account
* @param authority filter the pending and active syncs to cancel using this authority
*/
public void cancelSync(Account account, String authority) {
int userId = UserHandle.getCallingUserId();
// This makes it so that future permission checks will be in the context of this
// process rather than the caller's process. We will restore this before returning.
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.clearScheduledSyncOperations(account, userId, authority);
syncManager.cancelActiveSync(account, userId, authority);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
/**
* Get information about the SyncAdapters that are known to the system.
* @return an array of SyncAdapters that have registered with the system
*/
public SyncAdapterType[] getSyncAdapterTypes() {
// This makes it so that future permission checks will be in the context of this
// process rather than the caller's process. We will restore this before returning.
final int userId = UserHandle.getCallingUserId();
final long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
return syncManager.getSyncAdapterTypes(userId);
} finally {
restoreCallingIdentity(identityToken);
}
}
public boolean getSyncAutomatically(Account account, String providerName) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_SETTINGS,
"no permission to read the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().getSyncAutomatically(
account, userId, providerName);
}
} finally {
restoreCallingIdentity(identityToken);
}
return false;
}
public void setSyncAutomatically(Account account, String providerName, boolean sync) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.WRITE_SYNC_SETTINGS,
"no permission to write the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.getSyncStorageEngine().setSyncAutomatically(
account, userId, providerName, sync);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public void addPeriodicSync(Account account, String authority, Bundle extras,
long pollFrequency) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.WRITE_SYNC_SETTINGS,
"no permission to write the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
getSyncManager().getSyncStorageEngine().addPeriodicSync(
account, userId, authority, extras, pollFrequency);
} finally {
restoreCallingIdentity(identityToken);
}
}
public void removePeriodicSync(Account account, String authority, Bundle extras) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.WRITE_SYNC_SETTINGS,
"no permission to write the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
getSyncManager().getSyncStorageEngine().removePeriodicSync(account, userId, authority,
extras);
} finally {
restoreCallingIdentity(identityToken);
}
}
public List<PeriodicSync> getPeriodicSyncs(Account account, String providerName) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_SETTINGS,
"no permission to read the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
return getSyncManager().getSyncStorageEngine().getPeriodicSyncs(
account, userId, providerName);
} finally {
restoreCallingIdentity(identityToken);
}
}
public int getIsSyncable(Account account, String providerName) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_SETTINGS,
"no permission to read the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().getIsSyncable(
account, userId, providerName);
}
} finally {
restoreCallingIdentity(identityToken);
}
return -1;
}
public void setIsSyncable(Account account, String providerName, int syncable) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.WRITE_SYNC_SETTINGS,
"no permission to write the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.getSyncStorageEngine().setIsSyncable(
account, userId, providerName, syncable);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public boolean getMasterSyncAutomatically() {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_SETTINGS,
"no permission to read the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().getMasterSyncAutomatically(userId);
}
} finally {
restoreCallingIdentity(identityToken);
}
return false;
}
public void setMasterSyncAutomatically(boolean flag) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.WRITE_SYNC_SETTINGS,
"no permission to write the sync settings");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
syncManager.getSyncStorageEngine().setMasterSyncAutomatically(flag, userId);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public boolean isSyncActive(Account account, String authority) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_STATS,
"no permission to read the sync stats");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().isSyncActive(
account, userId, authority);
}
} finally {
restoreCallingIdentity(identityToken);
}
return false;
}
public List<SyncInfo> getCurrentSyncs() {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_STATS,
"no permission to read the sync stats");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
return getSyncManager().getSyncStorageEngine().getCurrentSyncs(userId);
} finally {
restoreCallingIdentity(identityToken);
}
}
public SyncStatusInfo getSyncStatus(Account account, String authority) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_STATS,
"no permission to read the sync stats");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().getStatusByAccountAndAuthority(
account, userId, authority);
}
} finally {
restoreCallingIdentity(identityToken);
}
return null;
}
public boolean isSyncPending(Account account, String authority) {
mContext.enforceCallingOrSelfPermission(Manifest.permission.READ_SYNC_STATS,
"no permission to read the sync stats");
int userId = UserHandle.getCallingUserId();
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null) {
return syncManager.getSyncStorageEngine().isSyncPending(account, userId, authority);
}
} finally {
restoreCallingIdentity(identityToken);
}
return false;
}
public void addStatusChangeListener(int mask, ISyncStatusObserver callback) {
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null && callback != null) {
syncManager.getSyncStorageEngine().addStatusChangeListener(mask, callback);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public void removeStatusChangeListener(ISyncStatusObserver callback) {
long identityToken = clearCallingIdentity();
try {
SyncManager syncManager = getSyncManager();
if (syncManager != null && callback != null) {
syncManager.getSyncStorageEngine().removeStatusChangeListener(callback);
}
} finally {
restoreCallingIdentity(identityToken);
}
}
public static ContentService main(Context context, boolean factoryTest) {
ContentService service = new ContentService(context, factoryTest);
ServiceManager.addService(ContentResolver.CONTENT_SERVICE_NAME, service);
return service;
}
/**
* Hide this class since it is not part of api,
* but current unittest framework requires it to be public
* @hide
*/
public static final class ObserverNode {
private class ObserverEntry implements IBinder.DeathRecipient {
public final IContentObserver observer;
public final int uid;
public final int pid;
public final boolean notifyForDescendants;
private final int userHandle;
private final Object observersLock;
public ObserverEntry(IContentObserver o, boolean n, Object observersLock,
int _uid, int _pid, int _userHandle) {
this.observersLock = observersLock;
observer = o;
uid = _uid;
pid = _pid;
userHandle = _userHandle;
notifyForDescendants = n;
try {
observer.asBinder().linkToDeath(this, 0);
} catch (RemoteException e) {
binderDied();
}
}
public void binderDied() {
synchronized (observersLock) {
removeObserverLocked(observer);
}
}
public void dumpLocked(FileDescriptor fd, PrintWriter pw, String[] args,
String name, String prefix, SparseIntArray pidCounts) {
pidCounts.put(pid, pidCounts.get(pid)+1);
pw.print(prefix); pw.print(name); pw.print(": pid=");
pw.print(pid); pw.print(" uid=");
pw.print(uid); pw.print(" user=");
pw.print(userHandle); pw.print(" target=");
pw.println(Integer.toHexString(System.identityHashCode(
observer != null ? observer.asBinder() : null)));
}
}
public static final int INSERT_TYPE = 0;
public static final int UPDATE_TYPE = 1;
public static final int DELETE_TYPE = 2;
private String mName;
private ArrayList<ObserverNode> mChildren = new ArrayList<ObserverNode>();
private ArrayList<ObserverEntry> mObservers = new ArrayList<ObserverEntry>();
public ObserverNode(String name) {
mName = name;
}
public void dumpLocked(FileDescriptor fd, PrintWriter pw, String[] args,
String name, String prefix, int[] counts, SparseIntArray pidCounts) {
String innerName = null;
if (mObservers.size() > 0) {
if ("".equals(name)) {
innerName = mName;
} else {
innerName = name + "/" + mName;
}
for (int i=0; i<mObservers.size(); i++) {
counts[1]++;
mObservers.get(i).dumpLocked(fd, pw, args, innerName, prefix,
pidCounts);
}
}
if (mChildren.size() > 0) {
if (innerName == null) {
if ("".equals(name)) {
innerName = mName;
} else {
innerName = name + "/" + mName;
}
}
for (int i=0; i<mChildren.size(); i++) {
counts[0]++;
mChildren.get(i).dumpLocked(fd, pw, args, innerName, prefix,
counts, pidCounts);
}
}
}
private String getUriSegment(Uri uri, int index) {
if (uri != null) {
if (index == 0) {
return uri.getAuthority();
} else {
return uri.getPathSegments().get(index - 1);
}
} else {
return null;
}
}
private int countUriSegments(Uri uri) {
if (uri == null) {
return 0;
}
return uri.getPathSegments().size() + 1;
}
// Invariant: userHandle is either a hard user number or is USER_ALL
public void addObserverLocked(Uri uri, IContentObserver observer,
boolean notifyForDescendants, Object observersLock,
int uid, int pid, int userHandle) {
addObserverLocked(uri, 0, observer, notifyForDescendants, observersLock,
uid, pid, userHandle);
}
private void addObserverLocked(Uri uri, int index, IContentObserver observer,
boolean notifyForDescendants, Object observersLock,
int uid, int pid, int userHandle) {
// If this is the leaf node add the observer
if (index == countUriSegments(uri)) {
mObservers.add(new ObserverEntry(observer, notifyForDescendants, observersLock,
uid, pid, userHandle));
return;
}
// Look to see if the proper child already exists
String segment = getUriSegment(uri, index);
if (segment == null) {
throw new IllegalArgumentException("Invalid Uri (" + uri + ") used for observer");
}
int N = mChildren.size();
for (int i = 0; i < N; i++) {
ObserverNode node = mChildren.get(i);
if (node.mName.equals(segment)) {
node.addObserverLocked(uri, index + 1, observer, notifyForDescendants,
observersLock, uid, pid, userHandle);
return;
}
}
// No child found, create one
ObserverNode node = new ObserverNode(segment);
mChildren.add(node);
node.addObserverLocked(uri, index + 1, observer, notifyForDescendants,
observersLock, uid, pid, userHandle);
}
public boolean removeObserverLocked(IContentObserver observer) {
int size = mChildren.size();
for (int i = 0; i < size; i++) {
boolean empty = mChildren.get(i).removeObserverLocked(observer);
if (empty) {
mChildren.remove(i);
i--;
size--;
}
}
IBinder observerBinder = observer.asBinder();
size = mObservers.size();
for (int i = 0; i < size; i++) {
ObserverEntry entry = mObservers.get(i);
if (entry.observer.asBinder() == observerBinder) {
mObservers.remove(i);
// We no longer need to listen for death notifications. Remove it.
observerBinder.unlinkToDeath(entry, 0);
break;
}
}
if (mChildren.size() == 0 && mObservers.size() == 0) {
return true;
}
return false;
}
private void collectMyObserversLocked(boolean leaf, IContentObserver observer,
boolean observerWantsSelfNotifications, int targetUserHandle,
ArrayList<ObserverCall> calls) {
int N = mObservers.size();
IBinder observerBinder = observer == null ? null : observer.asBinder();
for (int i = 0; i < N; i++) {
ObserverEntry entry = mObservers.get(i);
// Don't notify the observer if it sent the notification and isn't interested
// in self notifications
boolean selfChange = (entry.observer.asBinder() == observerBinder);
if (selfChange && !observerWantsSelfNotifications) {
continue;
}
// Does this observer match the target user?
if (targetUserHandle == UserHandle.USER_ALL
|| entry.userHandle == UserHandle.USER_ALL
|| targetUserHandle == entry.userHandle) {
// Make sure the observer is interested in the notification
if (leaf || (!leaf && entry.notifyForDescendants)) {
calls.add(new ObserverCall(this, entry.observer, selfChange));
}
}
}
}
/**
* targetUserHandle is either a hard user handle or is USER_ALL
*/
public void collectObserversLocked(Uri uri, int index, IContentObserver observer,
boolean observerWantsSelfNotifications, int targetUserHandle,
ArrayList<ObserverCall> calls) {
String segment = null;
int segmentCount = countUriSegments(uri);
if (index >= segmentCount) {
// This is the leaf node, notify all observers
collectMyObserversLocked(true, observer, observerWantsSelfNotifications,
targetUserHandle, calls);
} else if (index < segmentCount){
segment = getUriSegment(uri, index);
// Notify any observers at this level who are interested in descendants
collectMyObserversLocked(false, observer, observerWantsSelfNotifications,
targetUserHandle, calls);
}
int N = mChildren.size();
for (int i = 0; i < N; i++) {
ObserverNode node = mChildren.get(i);
if (segment == null || node.mName.equals(segment)) {
// We found the child,
node.collectObserversLocked(uri, index + 1,
observer, observerWantsSelfNotifications, targetUserHandle, calls);
if (segment != null) {
break;
}
}
}
}
}
}