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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.providers.contacts;
import com.android.internal.util.XmlUtils;
import com.google.android.collect.Maps;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import android.accounts.AccountManager;
import android.accounts.AuthenticatorDescription;
import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ServiceInfo;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.res.XmlResourceParser;
import android.util.Log;
import java.io.IOException;
import java.util.HashMap;
/**
* Maintains a cache of photo priority per account type. During contact aggregation
* photo with a higher priority is chosen for the the entire contact, barring an
* explicit override by the user, which is captured as the is_superprimary flag
* on the photo itself.
*/
public class PhotoPriorityResolver {
private static final String TAG = "PhotoPriorityResolver";
public static final int DEFAULT_PRIORITY = 7;
/**
* Meta-data key for the contacts configuration associated with a sync service.
*/
private static final String METADATA_CONTACTS = "android.provider.CONTACTS_STRUCTURE";
/**
* The XML tag capturing the picture priority. The syntax is:
* <code><Picture android:priority="6"/></code>
*/
private static final String PICTURE_TAG = "Picture";
/**
* Name of the attribute of the Picture tag capturing the priority itself.
*/
private static final String PRIORITY_ATTR = "priority";
private Context mContext;
private HashMap<String, Integer> mPhotoPriorities = Maps.newHashMap();
public PhotoPriorityResolver(Context context) {
mContext = context;
}
/**
* Returns the photo priority for the specified account type. Maintains cache
* of photo priorities.
*/
public synchronized int getPhotoPriority(String accountType) {
if (accountType == null) {
return DEFAULT_PRIORITY;
}
Integer priority = mPhotoPriorities.get(accountType);
if (priority == null) {
priority = resolvePhotoPriority(accountType);
mPhotoPriorities.put(accountType, priority);
}
return priority;
}
/**
* Finds photo priority for the specified account type.
*/
private int resolvePhotoPriority(String accountType) {
final AccountManager am = AccountManager.get(mContext);
for (AuthenticatorDescription auth : am.getAuthenticatorTypes()) {
if (accountType.equals(auth.type)) {
return resolvePhotoPriorityFromMetaData(auth.packageName);
}
}
return DEFAULT_PRIORITY;
}
/**
* Finds the meta-data XML containing the contacts configuration and
* reads the picture priority from that file.
*/
/* package */ int resolvePhotoPriorityFromMetaData(String packageName) {
final PackageManager pm = mContext.getPackageManager();
try {
PackageInfo pi = pm.getPackageInfo(packageName, PackageManager.GET_SERVICES
| PackageManager.GET_META_DATA);
if (pi != null && pi.services != null) {
for (ServiceInfo si : pi.services) {
final XmlResourceParser parser = si.loadXmlMetaData(pm, METADATA_CONTACTS);
if (parser != null) {
return loadPhotoPriorityFromXml(mContext, parser);
}
}
}
} catch (NameNotFoundException e) {
Log.w(TAG, "Problem loading photo priorities: " + e.toString());
}
return DEFAULT_PRIORITY;
}
private int loadPhotoPriorityFromXml(Context context, XmlPullParser parser) {
int priority = DEFAULT_PRIORITY;
try {
int type;
while ((type = parser.next()) != XmlPullParser.START_TAG
&& type != XmlPullParser.END_DOCUMENT) {
// Drain comments and whitespace
}
if (type != XmlPullParser.START_TAG) {
throw new IllegalStateException("No start tag found");
}
final int depth = parser.getDepth();
while (((type = parser.next()) != XmlPullParser.END_TAG || parser.getDepth() > depth)
&& type != XmlPullParser.END_DOCUMENT) {
String name = parser.getName();
if (type == XmlPullParser.START_TAG && PICTURE_TAG.equals(name)) {
int attributeCount = parser.getAttributeCount();
for (int i = 0; i < attributeCount; i++) {
String attr = parser.getAttributeName(i);
if (PRIORITY_ATTR.equals(attr)) {
priority = XmlUtils.convertValueToInt(parser.getAttributeValue(i),
DEFAULT_PRIORITY);
} else {
throw new IllegalStateException("Unsupported attribute " + attr);
}
}
}
}
} catch (XmlPullParserException e) {
throw new IllegalStateException("Problem reading XML", e);
} catch (IOException e) {
throw new IllegalStateException("Problem reading XML", e);
}
return priority;
}
}
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