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.beam.sdk.schemas.logicaltypes;
  
  import static org.apache.beam.sdk.util.Preconditions.checkArgumentNotNull;
  
  import java.io.Serializable;
  import java.util.Arrays;
  import java.util.Comparator;
  import java.util.List;
  import java.util.Map;
  import java.util.Map.Entry;
  import java.util.Objects;
  import java.util.stream.Collectors;
  import java.util.stream.IntStream;
  import org.apache.beam.sdk.schemas.Schema.FieldType;
  import org.apache.beam.sdk.schemas.Schema.LogicalType;
  import org.apache.beam.sdk.schemas.logicaltypes.EnumerationType.Value;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.BiMap;
  import org.apache.beam.vendor.guava.v32_1_2_jre.com.google.common.collect.ImmutableBiMap;
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  /** This {@link LogicalType} represent an enumeration over a fixed set of values. */
  public class EnumerationType implements LogicalType<Value, Integer> {
    public static final String IDENTIFIER = "Enum";
    final BiMap<String, Integer> enumValues;
    final List<String> values;
  
    private EnumerationType(Map<String, Integer> enumValues) {
      this.enumValues = ImmutableBiMap.copyOf(enumValues);
      values =
          enumValues.entrySet().stream()
              .sorted(Comparator.comparingInt(e -> e.getValue()))
              .map(Entry::getKey)
              .collect(Collectors.toList());
    }
  
    /** Create an enumeration type over a set of String->Integer values. */
    public static EnumerationType create(Map<String, Integer> enumValues) {
      return new EnumerationType(enumValues);
    }
  
    /**
     * Create an enumeration type from a fixed set of String values; integer values will be
     * automatically chosen.
     */
    public static EnumerationType create(List<String> enumValues) {
      return new EnumerationType(
          IntStream.range(0, enumValues.size())
              .boxed()
              .collect(Collectors.toMap(i -> enumValues.get(i), i -> i)));
    }
  
    /**
     * Create an enumeration type from a fixed set of String values; integer values will be
     * automatically chosen.
     */
    public static EnumerationType create(String... enumValues) {
      return create(Arrays.asList(enumValues));
    }
    /** Return an {@link Value} corresponding to one of the enumeration strings. */
    public Value valueOf(String stringValue) {
      return new Value(
          checkArgumentNotNull(
              enumValues.get(stringValue), "Unknown enumeration value {}", stringValue));
    }
  
    /** Return an {@link Value} corresponding to one of the enumeration integer values. */
    public Value valueOf(int value) {
      return new Value(value);
    }
  
    @Override
    public String getIdentifier() {
      return IDENTIFIER;
    }
  
    @Override
    public FieldType getArgumentType() {
      return FieldType.map(FieldType.STRING, FieldType.INT32);
    }
  
    @Override
    public Map<String, Integer> getArgument() {
      return enumValues;
    }
  
    @Override
    public FieldType getBaseType() {
      return FieldType.INT32;
    }
  
    @Override
    public Integer toBaseType(Value input) {
      return input.getValue();
    }
  
    @Override
    public Value toInputType(Integer base) {
      return valueOf(base);
    }
  
    public BiMap<String, Integer> getValuesMap() {
      return enumValues;
    }
  
    public @Nullable String getEnumName(int number) {
      return enumValues.inverse().get(number);
    }
  
    public @Nullable Integer getEnumValue(String enumName) {
      return enumValues.get(enumName);
    }
  
    public List<String> getValues() {
      return values;
    }
  
    public String toString(EnumerationType.Value value) {
      return checkArgumentNotNull(
          enumValues.inverse().get(value.getValue()),
          "Unknown enumeration value {}",
          value.getValue());
    }
  
    @Override
    public String toString() {
      return "Enumeration: " + enumValues;
    }
  
    /**
     * This class represents a single enum value. It can be referenced as a String or as an integer.
     */
    public static class Value implements Serializable {
      private final int value;
  
      public Value(int value) {
        this.value = value;
      }
  
      /** Return the integer enum value. */
      public int getValue() {
        return value;
      }
  
      @Override
      public boolean equals(@Nullable Object o) {
        if (this == o) {
          return true;
        }
        if (o == null || getClass() != o.getClass()) {
          return false;
        }
        Value enumValue = (Value) o;
        return value == enumValue.value;
      }
  
      @Override
      public int hashCode() {
        return Objects.hash(value);
      }
  
      @Override
      public String toString() {
        return "enum value: " + value;
      }
    }
  }
  