content: package com.alibaba.qlexpress4.runtime.instruction;
  
  import com.alibaba.qlexpress4.QLOptions;
  import com.alibaba.qlexpress4.exception.ErrorReporter;
  import com.alibaba.qlexpress4.exception.QLErrorCodes;
  import com.alibaba.qlexpress4.exception.UserDefineException;
  import com.alibaba.qlexpress4.runtime.*;
  import com.alibaba.qlexpress4.runtime.data.DataValue;
  import com.alibaba.qlexpress4.runtime.util.ThrowUtils;
  import com.alibaba.qlexpress4.runtime.util.ValueUtils;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.util.function.Consumer;
  
  /**
   * Operation: call a lambda with fixed number of arguments
   * Input: ${argNum} + 1
   * Output: 1, lambda return result
   * <p>
   * Author: DQinYuan
   */
  public class CallInstruction extends QLInstruction {
      
      private final int argNum;
      
      public CallInstruction(ErrorReporter errorReporter, int argNum) {
          super(errorReporter);
          this.argNum = argNum;
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          Parameters parameters = qContext.pop(this.argNum + 1);
          Object bean = parameters.get(0).get();
          if (bean == null) {
              if (qlOptions.isAvoidNullPointer()) {
                  qContext.push(DataValue.NULL_VALUE);
                  return QResult.NEXT_INSTRUCTION;
              }
              else {
                  throw this.errorReporter.report(new NullPointerException(),
                      QLErrorCodes.NULL_CALL.name(),
                      QLErrorCodes.NULL_CALL.getErrorMsg());
              }
          }
          if (!(bean instanceof QLambda)) {
              throw this.errorReporter.report(QLErrorCodes.OBJECT_NOT_CALLABLE.name(),
                  String.format(QLErrorCodes.OBJECT_NOT_CALLABLE.getErrorMsg(), bean.getClass().getName()));
          }
          Object[] params = new Object[this.argNum];
          for (int i = 0; i < this.argNum; i++) {
              params[i] = parameters.get(i + 1).get();
          }
          try {
              QLambda qLambda = (QLambda)bean;
              qContext.push(ValueUtils.toImmutable(qLambda.call(params).getResult()));
              return QResult.NEXT_INSTRUCTION;
          }
          catch (UserDefineException e) {
              throw ThrowUtils.reportUserDefinedException(errorReporter, e);
          }
          catch (Throwable t) {
              throw ThrowUtils.wrapThrowable(t,
                  errorReporter,
                  QLErrorCodes.INVOKE_LAMBDA_ERROR.name(),
                  QLErrorCodes.INVOKE_LAMBDA_ERROR.getErrorMsg());
          }
      }
      
      @Override
      public int stackInput() {
          return argNum + 1;
      }
      
      @Override
      public int stackOutput() {
          return 1;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth, index + ": Call with argNum " + argNum, debug);
      }
  }
  