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.runtime.QContext;
  import com.alibaba.qlexpress4.runtime.QResult;
  import com.alibaba.qlexpress4.runtime.data.DataValue;
  import com.alibaba.qlexpress4.runtime.trace.ExpressionTrace;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.util.function.Consumer;
  
  /**
   * Operation: if the element is ${expect}, jump to position, else execute next instruction as normal. not jump if null
   * Input: 0
   * Output: 0
   *
   * Author: DQinYuan
   */
  public class JumpIfInstruction extends QLInstruction {
      
      private final boolean expect;
      
      private int position;
      
      private final Integer traceKey;
      
      public JumpIfInstruction(ErrorReporter errorReporter, boolean expect, int position, Integer traceKey) {
          super(errorReporter);
          this.expect = expect;
          this.position = position;
          this.traceKey = traceKey;
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          boolean conditionBool = conditionToBool(qContext.peek().get());
          if (conditionBool == expect && !qlOptions.isShortCircuitDisable()) {
              // short circuit
              // trace
              ExpressionTrace expressionTrace = qContext.getTraces().getExpressionTraceByKey(traceKey);
              if (expressionTrace != null) {
                  expressionTrace.valueEvaluated(conditionBool);
                  expressionTrace.getChildren().get(0).valueEvaluated(conditionBool);
              }
              return new QResult(new DataValue(position), QResult.ResultType.JUMP);
          }
          else {
              return QResult.NEXT_INSTRUCTION;
          }
      }
      
      private boolean conditionToBool(Object condition) {
          if (condition == null) {
              return !expect;
          }
          if (!(condition instanceof Boolean)) {
              throw errorReporter.report(QLErrorCodes.CONDITION_BOOL_REQUIRED.name(),
                  QLErrorCodes.CONDITION_BOOL_REQUIRED.getErrorMsg());
          }
          return (boolean)condition;
      }
      
      @Override
      public int stackInput() {
          return 0;
      }
      
      @Override
      public int stackOutput() {
          return 0;
      }
      
      public void setPosition(int position) {
          this.position = position;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth, index + ": JumpIf " + expect + " " + position, debug);
      }
  }
  