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.calcite.adapter.druid;
  
  import com.fasterxml.jackson.core.JsonGenerator;
  
  import org.checkerframework.checker.nullness.qual.Nullable;
  
  import java.io.IOException;
  
  import static java.util.Objects.requireNonNull;
  
  /**
   * Default implementation of DimensionSpec.
   *
   * <p>The default implementation returns dimension values as is and optionally
   * renames the dimension.
   */
  public class DefaultDimensionSpec implements DimensionSpec {
  
    private final String dimension;
    private final String outputName;
    private final DruidType outputType;
  
    public DefaultDimensionSpec(String dimension, String outputName,
        @Nullable DruidType outputType) {
      this.dimension = requireNonNull(dimension, "dimension");
      this.outputName = requireNonNull(outputName, "outputName");
      this.outputType = outputType == null ? DruidType.STRING : outputType;
    }
  
    public DefaultDimensionSpec(String dimension) {
      this(dimension, dimension, null);
    }
  
    @Override public void write(JsonGenerator generator) throws IOException {
      generator.writeStartObject();
      generator.writeStringField("type", "default");
      generator.writeStringField("dimension", dimension);
      generator.writeStringField("outputName", outputName);
      generator.writeStringField("outputType", outputType.name());
      generator.writeEndObject();
    }
  
    @Override public String getOutputName() {
      return outputName;
    }
  
    @Override public DruidType getOutputType() {
      return outputType;
    }
  
    @Override public @Nullable ExtractionFunction getExtractionFn() {
      return null;
    }
  
    @Override public String getDimension() {
      return dimension;
    }
  }
  