content: /*
   * Copyright (C) 2020 ActiveJ LLC.
   *
   * 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 io.activej.codegen.expression;
  
  import io.activej.codegen.Context;
  import org.jetbrains.annotations.Nullable;
  import org.objectweb.asm.Type;
  
  /**
   * These are basic methods for functions that allow to read the state and to process data
   */
  public interface Expression {
  	/**
  	 * Processes data and returns its type
  	 *
  	 * @param ctx information about a dynamic class
  	 * @return type of the processes data or {@code null} if expression throws an exception
  	 */
  	@Nullable Type load(Context ctx);
  }
  