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/*
* Copyright (C) 2010 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.am;
import android.content.Intent;
import android.net.Uri;
import android.os.Binder;
import android.os.IBinder;
import java.util.HashSet;
import java.util.Iterator;
final class UriPermissionOwner {
final ActivityManagerService service;
final Object owner;
Binder externalToken;
HashSet<UriPermission> readUriPermissions; // special access to reading uris.
HashSet<UriPermission> writeUriPermissions; // special access to writing uris.
class ExternalToken extends Binder {
UriPermissionOwner getOwner() {
return UriPermissionOwner.this;
}
}
UriPermissionOwner(ActivityManagerService _service, Object _owner) {
service = _service;
owner = _owner;
}
Binder getExternalTokenLocked() {
if (externalToken == null) {
externalToken = new ExternalToken();
}
return externalToken;
}
static UriPermissionOwner fromExternalToken(IBinder token) {
if (token instanceof ExternalToken) {
return ((ExternalToken)token).getOwner();
}
return null;
}
void removeUriPermissionsLocked() {
removeUriPermissionsLocked(Intent.FLAG_GRANT_READ_URI_PERMISSION
| Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
}
void removeUriPermissionsLocked(int mode) {
if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0
&& readUriPermissions != null) {
for (UriPermission perm : readUriPermissions) {
perm.removeReadOwner(this);
service.removeUriPermissionIfNeededLocked(perm);
}
readUriPermissions = null;
}
if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0
&& writeUriPermissions != null) {
for (UriPermission perm : writeUriPermissions) {
perm.removeWriteOwner(this);
service.removeUriPermissionIfNeededLocked(perm);
}
writeUriPermissions = null;
}
}
void removeUriPermissionLocked(Uri uri, int mode) {
if ((mode&Intent.FLAG_GRANT_READ_URI_PERMISSION) != 0
&& readUriPermissions != null) {
Iterator<UriPermission> it = readUriPermissions.iterator();
while (it.hasNext()) {
UriPermission perm = it.next();
if (uri.equals(perm.uri)) {
perm.removeReadOwner(this);
service.removeUriPermissionIfNeededLocked(perm);
it.remove();
}
}
if (readUriPermissions.size() == 0) {
readUriPermissions = null;
}
}
if ((mode&Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != 0
&& writeUriPermissions != null) {
Iterator<UriPermission> it = writeUriPermissions.iterator();
while (it.hasNext()) {
UriPermission perm = it.next();
if (uri.equals(perm.uri)) {
perm.removeWriteOwner(this);
service.removeUriPermissionIfNeededLocked(perm);
it.remove();
}
}
if (writeUriPermissions.size() == 0) {
writeUriPermissions = null;
}
}
}
public void addReadPermission(UriPermission perm) {
if (readUriPermissions == null) {
readUriPermissions = new HashSet<UriPermission>();
}
readUriPermissions.add(perm);
}
public void addWritePermission(UriPermission perm) {
if (writeUriPermissions == null) {
writeUriPermissions = new HashSet<UriPermission>();
}
writeUriPermissions.add(perm);
}
public void removeReadPermission(UriPermission perm) {
readUriPermissions.remove(perm);
if (readUriPermissions.size() == 0) {
readUriPermissions = null;
}
}
public void removeWritePermission(UriPermission perm) {
writeUriPermissions.remove(perm);
if (writeUriPermissions.size() == 0) {
writeUriPermissions = null;
}
}
@Override
public String toString() {
return owner.toString();
}
}
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