content: /*
   * Copyright © 2018-2025 Commonwealth Scientific and Industrial Research
   * Organisation (CSIRO) ABN 41 687 119 230.
   *
   * 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 au.csiro.pathling.projection;
  
  import jakarta.annotation.Nonnull;
  
  /**
   * Represents a component of an abstract query for projecting FHIR data.
   */
  public interface ProjectionClause {
  
    /**
     * Converts this clause into a result using the supplied context.
     *
     * @param context The context in which to evaluate this clause
     * @return The result of evaluating this clause
     */
    @Nonnull
    ProjectionResult evaluate(@Nonnull final ProjectionContext context);
  
    /**
     * Returns a tree-like string representation of this clause for debugging purposes.
     *
     * @param level the indentation level for the tree structure
     * @return a formatted tree string representation
     */
    @Nonnull
    String toTreeString(final int level);
  
  }
  