content: /*
   * 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.airlift.bytecode.expression;
  
  import com.google.common.collect.ImmutableList;
  import io.airlift.bytecode.BytecodeBlock;
  import io.airlift.bytecode.BytecodeNode;
  import io.airlift.bytecode.MethodGenerationContext;
  import io.airlift.bytecode.instruction.InstructionNode;
  
  import java.util.List;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static io.airlift.bytecode.ArrayOpCode.getArrayOpCode;
  import static java.util.Objects.requireNonNull;
  
  class GetElementBytecodeExpression
          extends BytecodeExpression
  {
      private final BytecodeExpression instance;
      private final BytecodeExpression index;
      private final InstructionNode arrayLoadInstruction;
  
      public GetElementBytecodeExpression(BytecodeExpression instance, BytecodeExpression index)
      {
          super(instance.getType().getArrayComponentType());
          this.instance = requireNonNull(instance, "instance is null");
          this.index = requireNonNull(index, "index is null");
  
          checkArgument(index.getType().getPrimitiveType() == int.class, "index must be int type, but is " + index.getType());
          this.arrayLoadInstruction = getArrayOpCode(instance.getType().getArrayComponentType()).getLoad();
      }
  
      @Override
      public BytecodeNode getBytecode(MethodGenerationContext generationContext)
      {
          return new BytecodeBlock()
                  .append(instance.getBytecode(generationContext))
                  .append(index)
                  .append(arrayLoadInstruction);
      }
  
      @Override
      protected String formatOneLine()
      {
          return instance + "[" + index + "]";
      }
  
      @Override
      public List<BytecodeNode> getChildNodes()
      {
          return ImmutableList.of(index);
      }
  }
  