content: package com.alibaba.qlexpress4.runtime.instruction;
  
  import com.alibaba.qlexpress4.QLOptions;
  import com.alibaba.qlexpress4.exception.ErrorReporter;
  import com.alibaba.qlexpress4.runtime.*;
  import com.alibaba.qlexpress4.runtime.data.DataValue;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.util.function.Consumer;
  
  /**
   * Operation: instantiate lambda definition on stack
   * Input: 0
   * Output: 1 lambda instance
   *
   * Author: DQinYuan
   */
  public class LoadLambdaInstruction extends QLInstruction {
      
      private final QLambdaDefinition lambdaDefinition;
      
      public LoadLambdaInstruction(ErrorReporter errorReporter, QLambdaDefinition lambdaDefinition) {
          super(errorReporter);
          this.lambdaDefinition = lambdaDefinition;
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          QLambda lambdaInstance = lambdaDefinition.toLambda(qContext, qlOptions, true);
          qContext.push(new DataValue(lambdaInstance));
          return QResult.NEXT_INSTRUCTION;
      }
      
      @Override
      public int stackInput() {
          return 0;
      }
      
      @Override
      public int stackOutput() {
          return 1;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth, index + ": LoadLambda", debug);
          lambdaDefinition.println(depth + 1, debug);
      }
      
      public QLambdaDefinition getLambdaDefinition() {
          return lambdaDefinition;
      }
  }
  