content: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you 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 org.apache.cassandra.db.virtual;
  
  import java.util.Arrays;
  
  import org.apache.cassandra.config.CassandraRelevantEnv;
  import org.apache.cassandra.config.CassandraRelevantProperties;
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.db.DecoratedKey;
  import org.apache.cassandra.db.marshal.*;
  import org.apache.cassandra.dht.LocalPartitioner;
  import org.apache.cassandra.schema.TableMetadata;
  
  final class SystemPropertiesTable extends AbstractVirtualTable
  {
      private static final String NAME = "name";
      private static final String VALUE = "value";
  
      SystemPropertiesTable(String keyspace)
      {
          super(TableMetadata.builder(keyspace, "system_properties")
                             .comment("Cassandra relevant system properties")
                             .kind(TableMetadata.Kind.VIRTUAL)
                             .partitioner(new LocalPartitioner(UTF8Type.instance))
                             .addPartitionKeyColumn(NAME, UTF8Type.instance)
                             .addRegularColumn(VALUE, UTF8Type.instance)
                             .build());
      }
  
      public DataSet data()
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
  
          System.getenv().keySet() // checkstyle: suppress nearby 'blockSystemPropertyUsage'
                .stream()
                .filter(SystemPropertiesTable::isCassandraRelevant)
                .forEach(name -> addRow(result, name, System.getenv(name))); // checkstyle: suppress nearby 'blockSystemPropertyUsage'
  
          System.getProperties().stringPropertyNames()
                .stream()
                .filter(SystemPropertiesTable::isCassandraRelevant)
                .forEach(name -> addRow(result, name, System.getProperty(name))); // checkstyle: suppress nearby 'blockSystemPropertyUsage'
  
          return result;
      }
  
      @Override
      public DataSet data(DecoratedKey partitionKey)
      {
          SimpleDataSet result = new SimpleDataSet(metadata());
          String name = UTF8Type.instance.compose(partitionKey.getKey());
          if (isCassandraRelevant(name))
              addRow(result, name, System.getProperty(name, System.getenv(name))); // checkstyle: suppress nearby 'blockSystemPropertyUsage'
  
          return result;
      }
  
      static boolean isCassandraRelevant(String name)
      {
          return name.startsWith(Config.PROPERTY_PREFIX)
                 || Arrays.stream(CassandraRelevantProperties.values()).anyMatch(p -> p.getKey().equals(name))
                 || Arrays.stream(CassandraRelevantEnv.values()).anyMatch(p -> p.getKey().equals(name));
      }
  
      private static void addRow(SimpleDataSet result, String name, String value)
      {
          result.row(name).column(VALUE, value);
      }
  }
  