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.LeftValue;
  import com.alibaba.qlexpress4.runtime.Parameters;
  import com.alibaba.qlexpress4.runtime.QContext;
  import com.alibaba.qlexpress4.runtime.QResult;
  import com.alibaba.qlexpress4.runtime.Value;
  import com.alibaba.qlexpress4.runtime.data.DataValue;
  import com.alibaba.qlexpress4.utils.PrintlnUtils;
  
  import java.lang.reflect.Constructor;
  import java.lang.reflect.InvocationTargetException;
  import java.util.List;
  import java.util.function.Consumer;
  
  /**
   * Operation: new a Map with top ${keys.length} stack element
   * Input: ${keys.length}
   * Output: 1
   * <p>
   * Author: DQinYuan
   */
  public class NewFilledInstanceInstruction extends QLInstruction {
      
      private final Class<?> newCls;
      
      private final List<String> keys;
      
      public NewFilledInstanceInstruction(ErrorReporter errorReporter, Class<?> newCls, List<String> keys) {
          super(errorReporter);
          this.newCls = newCls;
          this.keys = keys;
      }
      
      @Override
      public QResult execute(QContext qContext, QLOptions qlOptions) {
          Object instance = newInstance(qContext);
          Parameters initItems = qContext.pop(keys.size());
          for (int i = 0; i < keys.size(); i++) {
              Object initValue = initItems.get(i).get();
              String fieldName = keys.get(i);
              Value fieldValue = qContext.getReflectLoader().loadField(instance, fieldName, false, errorReporter);
              if (fieldValue == null) {
                  // ignore field that don't exist
                  continue;
              }
              if (!(fieldValue instanceof LeftValue)) {
                  throw errorReporter.reportFormat(QLErrorCodes.INVALID_ASSIGNMENT.name(),
                      QLErrorCodes.INVALID_ASSIGNMENT.getErrorMsg(),
                      "of field '" + fieldName + "'");
              }
              ((LeftValue)fieldValue).set(initValue, errorReporter);
          }
          qContext.push(new DataValue(instance));
          return QResult.NEXT_INSTRUCTION;
      }
      
      private Object newInstance(QContext qContext) {
          Constructor<?> constructor = qContext.getReflectLoader().loadConstructor(newCls, new Class[0]);
          try {
              return constructor.newInstance();
          }
          catch (InvocationTargetException e) {
              throw errorReporter.report(e.getTargetException(),
                  QLErrorCodes.INVOKE_CONSTRUCTOR_INNER_ERROR.name(),
                  QLErrorCodes.INVOKE_CONSTRUCTOR_INNER_ERROR.getErrorMsg());
          }
          catch (Exception e) {
              throw errorReporter.report(QLErrorCodes.INVOKE_CONSTRUCTOR_UNKNOWN_ERROR.name(),
                  QLErrorCodes.INVOKE_CONSTRUCTOR_UNKNOWN_ERROR.getErrorMsg());
          }
      }
      
      @Override
      public int stackInput() {
          return keys.size();
      }
      
      @Override
      public int stackOutput() {
          return 1;
      }
      
      @Override
      public void println(int index, int depth, Consumer<String> debug) {
          PrintlnUtils.printlnByCurDepth(depth,
              index + ": New instace of cls " + newCls.getSimpleName() + " with fields " + keys,
              debug);
      }
  }
  