Function resolve

packages/engine/Source/DataSources/ReferenceProperty.js:7–46

(that)

import Property from "./Property.js";

function resolve(that) {
  let targetProperty = that._targetProperty;

  if (!defined(targetProperty)) {
    let targetEntity = that._targetEntity;

    if (!defined(targetEntity)) {
      targetEntity = that._targetCollection.getById(that._targetId);

      if (!defined(targetEntity)) {
        // target entity not found
        that._targetEntity = that._targetProperty = undefined;
        return;
      }

      // target entity was found. listen for changes to entity definition
      targetEntity.definitionChanged.addEventListener(
        ReferenceProperty.prototype._onTargetEntityDefinitionChanged,
        that,
      );
      that._targetEntity = targetEntity;
    }

    // walk the list of property names and resolve properties
    const targetPropertyNames = that._targetPropertyNames;
    targetProperty = that._targetEntity;
    for (
      let i = 0, len = targetPropertyNames.length;
      i < len && defined(targetProperty);
      ++i
    ) {
      targetProperty = targetProperty[targetPropertyNames[i]];
    }

    // target property may or may not be defined, depending on if it was found
    that._targetProperty = targetProperty;
  }

  return targetProperty;
}

/**
 * A {@link Property} which transparently links to another property on a provided object.