content: /*
   * Copyright (C) 2009 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.accounts;
  
  import android.accounts.AccountManager;
  import android.accounts.AuthenticatorDescription;
  import android.accounts.IAccountAuthenticator;
  import android.content.Context;
  import android.content.pm.PackageManager;
  import android.content.pm.RegisteredServicesCache;
  import android.content.pm.XmlSerializerAndParser;
  import android.content.res.Resources;
  import android.content.res.TypedArray;
  import android.text.TextUtils;
  import android.util.AttributeSet;
  
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  import org.xmlpull.v1.XmlSerializer;
  
  import java.io.IOException;
  
  /**
   * A cache of services that export the {@link IAccountAuthenticator} interface. This cache
   * is built by interrogating the {@link PackageManager} and is updated as packages are added,
   * removed and changed. The authenticators are referred to by their account type and
   * are made available via the {@link RegisteredServicesCache#getServiceInfo} method.
   * @hide
   */
  /* package private */ class AccountAuthenticatorCache
          extends RegisteredServicesCache<AuthenticatorDescription>
          implements IAccountAuthenticatorCache {
      private static final String TAG = "Account";
      private static final MySerializer sSerializer = new MySerializer();
  
      public AccountAuthenticatorCache(Context context) {
          super(context, AccountManager.ACTION_AUTHENTICATOR_INTENT,
                  AccountManager.AUTHENTICATOR_META_DATA_NAME,
                  AccountManager.AUTHENTICATOR_ATTRIBUTES_NAME, sSerializer);
      }
  
      @Override
      public AuthenticatorDescription parseServiceAttributes(Resources res,
              String packageName, AttributeSet attrs) {
          TypedArray sa = res.obtainAttributes(attrs,
                  com.android.internal.R.styleable.AccountAuthenticator);
          try {
              final String accountType =
                      sa.getString(com.android.internal.R.styleable.AccountAuthenticator_accountType);
              final int labelId = sa.getResourceId(
                      com.android.internal.R.styleable.AccountAuthenticator_label, 0);
              final int iconId = sa.getResourceId(
                      com.android.internal.R.styleable.AccountAuthenticator_icon, 0);
              final int smallIconId = sa.getResourceId(
                      com.android.internal.R.styleable.AccountAuthenticator_smallIcon, 0);
              final int prefId = sa.getResourceId(
                      com.android.internal.R.styleable.AccountAuthenticator_accountPreferences, 0);
              final boolean customTokens = sa.getBoolean(
                      com.android.internal.R.styleable.AccountAuthenticator_customTokens, false);
              if (TextUtils.isEmpty(accountType)) {
                  return null;
              }
              return new AuthenticatorDescription(accountType, packageName, labelId, iconId,
                      smallIconId, prefId, customTokens);
          } finally {
              sa.recycle();
          }
      }
  
      private static class MySerializer implements XmlSerializerAndParser<AuthenticatorDescription> {
          @Override
          public void writeAsXml(AuthenticatorDescription item, XmlSerializer out)
                  throws IOException {
              out.attribute(null, "type", item.type);
          }
  
          @Override
          public AuthenticatorDescription createFromXml(XmlPullParser parser)
                  throws IOException, XmlPullParserException {
              return AuthenticatorDescription.newKey(parser.getAttributeValue(null, "type"));
          }
      }
  }
  