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.util.ThrowUtils;
  import com.alibaba.qlexpress4.runtime.util.ValueUtils;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.util.function.Consumer;
  
  /**
   * Operation: call const lambda
   * Input: ${argNum}
   * Output: 1 const lambda result
   * <p>
   * Author: DQinYuan
   */
  public class CallConstInstruction extends QLInstruction {
      
      private final QLambda constLambda;
      
      private final int argNum;
      
      private final String lambdaName;
      
      public CallConstInstruction(ErrorReporter errorReporter, QLambda constLambda, int argNum, String lambdaName) {
          super(errorReporter);
          this.constLambda = constLambda;
          this.argNum = argNum;
          this.lambdaName = lambdaName;
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          Parameters args = qContext.pop(argNum);
          Object[] argArr = new Object[argNum];
          for (int i = 0; i < argNum; i++) {
              argArr[i] = args.getValue(i);
          }
          
          try {
              QResult result = constLambda.call(argArr);
              qContext.push(ValueUtils.toImmutable(result.getResult()));
              return QResult.NEXT_INSTRUCTION;
          }
          catch (UserDefineException e) {
              throw ThrowUtils.reportUserDefinedException(errorReporter, e);
          }
          catch (Throwable t) {
              throw ThrowUtils.wrapThrowable(t,
                  errorReporter,
                  QLErrorCodes.EXECUTE_BLOCK_ERROR.name(),
                  QLErrorCodes.EXECUTE_BLOCK_ERROR.getErrorMsg());
          }
      }
      
      @Override
      public int stackInput() {
          return argNum;
      }
      
      @Override
      public int stackOutput() {
          return 1;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth, index + ": CallConstLambda " + lambdaName, debug);
      }
  }
  