content: /*
   * 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.server.firewall;
  
  import android.content.ComponentName;
  import android.content.Intent;
  import com.android.internal.util.XmlUtils;
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  
  import java.io.IOException;
  
  class NotFilter implements Filter {
      private final Filter mChild;
  
      private NotFilter(Filter child) {
          mChild = child;
      }
  
      @Override
      public boolean matches(IntentFirewall ifw, ComponentName resolvedComponent, Intent intent,
              int callerUid, int callerPid, String resolvedType, int receivingUid) {
          return !mChild.matches(ifw, resolvedComponent, intent, callerUid, callerPid, resolvedType,
                  receivingUid);
      }
  
      public static final FilterFactory FACTORY = new FilterFactory("not") {
          @Override
          public Filter newFilter(XmlPullParser parser)
                  throws IOException, XmlPullParserException {
              Filter child = null;
              int outerDepth = parser.getDepth();
              while (XmlUtils.nextElementWithin(parser, outerDepth)) {
                  Filter filter = IntentFirewall.parseFilter(parser);
                  if (child == null) {
                      child = filter;
                  } else {
                      throw new XmlPullParserException(
                              "<not> tag can only contain a single child filter.", parser, null);
                  }
              }
              return new NotFilter(child);
          }
      };
  }
  