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   * Licensed to the Apache Software Foundation (ASF) under one
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   * 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,
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   * See the License for the specific language governing permissions and
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  package org.apache.cassandra.io.sstable;
  
  import java.util.HashSet;
  import java.util.function.Function;
  
  import com.google.common.collect.Sets;
  import org.junit.Test;
  
  import org.apache.cassandra.config.Config;
  import org.apache.cassandra.config.DatabaseDescriptor;
  import org.apache.cassandra.io.sstable.Component.Type;
  import org.apache.cassandra.io.sstable.SSTableFormatTest.Format1;
  import org.apache.cassandra.io.sstable.SSTableFormatTest.Format2;
  import org.apache.cassandra.io.sstable.format.SSTableFormat.Components;
  import org.apache.cassandra.io.sstable.format.big.BigFormat;
  import org.mockito.Mockito;
  
  import static org.apache.cassandra.io.sstable.SSTableFormatTest.factory;
  import static org.assertj.core.api.Assertions.assertThat;
  import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
  
  public class ComponentTest
  {
      private static final String SECOND = "second";
      private static final String FIRST = "first";
  
      static
      {
          DatabaseDescriptor.daemonInitialization(() -> {
              Config config = DatabaseDescriptor.loadConfig();
              SSTableFormatTest.configure(new Config.SSTableConfig(), new BigFormat.BigFormatFactory(), factory("first", Format1.class), factory("second", Format2.class));
              return config;
          });
      }
  
      @Test
      public void testTypes()
      {
          Function<Type, Component> componentFactory = Mockito.mock(Function.class);
  
          // do not allow to define a type with the same name or repr as the existing type for this or parent format
          assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> Type.createSingleton(Components.Types.TOC.name, Components.Types.TOC.repr + "x", true, Format1.class));
          assertThatExceptionOfType(AssertionError.class).isThrownBy(() -> Type.createSingleton(Components.Types.TOC.name + "x", Components.Types.TOC.repr, true, Format2.class));
  
          // allow to define a format with other name and repr
          Type t1 = Type.createSingleton("ONE", "One.db", true, Format1.class);
  
          // allow to define a format with the same name and repr for two different formats
          Type t2f1 = Type.createSingleton("TWO", "Two.db", true, Format1.class);
          Type t2f2 = Type.createSingleton("TWO", "Two.db", true, Format2.class);
          assertThat(t2f1).isNotEqualTo(t2f2);
  
          assertThatExceptionOfType(NullPointerException.class).isThrownBy(() -> Type.createSingleton(null, "-Three.db", true, Format1.class));
  
          assertThat(Type.fromRepresentation("should be custom", BigFormat.getInstance())).isSameAs(Components.Types.CUSTOM);
          assertThat(Type.fromRepresentation(Components.Types.TOC.repr, BigFormat.getInstance())).isSameAs(Components.Types.TOC);
          assertThat(Type.fromRepresentation(t1.repr, DatabaseDescriptor.getSSTableFormats().get(FIRST))).isSameAs(t1);
          assertThat(Type.fromRepresentation(t2f1.repr, DatabaseDescriptor.getSSTableFormats().get(FIRST))).isSameAs(t2f1);
          assertThat(Type.fromRepresentation(t2f2.repr, DatabaseDescriptor.getSSTableFormats().get(SECOND))).isSameAs(t2f2);
      }
  
      @Test
      public void testComponents()
      {
          Type t3f1 = Type.createSingleton("THREE", "Three.db", true, Format1.class);
          Type t3f2 = Type.createSingleton("THREE", "Three.db", true, Format2.class);
          Type t4f1 = Type.create("FOUR", ".*-Four.db", true, Format1.class);
          Type t4f2 = Type.create("FOUR", ".*-Four.db", true, Format2.class);
  
          Component c1 = t3f1.getSingleton();
          Component c2 = t3f2.getSingleton();
  
          assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> t3f1.createComponent(t3f1.repr));
          assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> t3f2.createComponent(t3f2.repr));
          assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> t4f1.getSingleton());
          assertThatExceptionOfType(RuntimeException.class).isThrownBy(() -> t4f2.getSingleton());
  
          assertThat(Component.parse(t3f1.repr, DatabaseDescriptor.getSSTableFormats().get(FIRST))).isSameAs(c1);
          assertThat(Component.parse(t3f2.repr, DatabaseDescriptor.getSSTableFormats().get("second"))).isSameAs(c2);
          assertThat(c1).isNotEqualTo(c2);
          assertThat(c1.type).isSameAs(t3f1);
          assertThat(c2.type).isSameAs(t3f2);
  
          Component c3 = Component.parse("abc-Four.db", DatabaseDescriptor.getSSTableFormats().get(FIRST));
          Component c4 = Component.parse("abc-Four.db", DatabaseDescriptor.getSSTableFormats().get("second"));
          assertThat(c3.type).isSameAs(t4f1);
          assertThat(c4.type).isSameAs(t4f2);
          assertThat(c3.name).isEqualTo("abc-Four.db");
          assertThat(c4.name).isEqualTo("abc-Four.db");
          assertThat(c3).isNotEqualTo(c4);
          assertThat(c3).isNotEqualTo(c1);
          assertThat(c4).isNotEqualTo(c2);
  
          Component c5 = Component.parse("abc-Five.db", DatabaseDescriptor.getSSTableFormats().get(FIRST));
          assertThat(c5.type).isSameAs(Components.Types.CUSTOM);
          assertThat(c5.name).isEqualTo("abc-Five.db");
  
          Component c6 = Component.parse("Data.db", DatabaseDescriptor.getSSTableFormats().get("second"));
          assertThat(c6.type).isSameAs(Components.Types.DATA);
          assertThat(c6).isSameAs(Components.DATA);
  
          HashSet<Component> s1 = Sets.newHashSet(Component.getSingletonsFor(Format1.class));
          HashSet<Component> s2 = Sets.newHashSet(Component.getSingletonsFor(Format2.class));
          assertThat(s1).contains(c1, Components.DATA, Components.STATS, Components.COMPRESSION_INFO);
          assertThat(s2).contains(c2, Components.DATA, Components.STATS, Components.COMPRESSION_INFO);
          assertThat(s1).doesNotContain(c2);
          assertThat(s2).doesNotContain(c1);
  
          assertThat(Sets.newHashSet(Component.getSingletonsFor(DatabaseDescriptor.getSSTableFormats().get(FIRST)))).isEqualTo(s1);
          assertThat(Sets.newHashSet(Component.getSingletonsFor(DatabaseDescriptor.getSSTableFormats().get("second")))).isEqualTo(s2);
      }
  }
  