@gmsoft/spel2js/src/ast/PropertyReference.js

Parse Spring Expression Language in JavaScript

/*
 * Copyright 2002-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
import { has } from 'lodash';

import { SpelNode } from './SpelNode';

/**
 * Represents a simple property or field reference.
 *
 * @author Andy Clement
 * @author Juergen Hoeller
 * @author Clark Duplichien
 * @author Ben March
 * @since 0.2.0
 */

function createNode(nullSafeNavigation, propertyName, position) {
  var node = SpelNode.create('property', position);

  node.getValue = function (state) {
    var context = state.activeContext.peek();

    if (!context) {
      if (nullSafeNavigation) {
        return null;
      }

      throw {
        name: 'ContextDoesNotExistException',
        message: "Attempting to look up property '" + propertyName + "' for an undefined context.",
      };
    }
    if (!has(context, propertyName)) {
      //handle safe navigation
      if (nullSafeNavigation) {
        return null;
      }

      //handle conversion of Java properties to JavaScript properties
      if (propertyName === 'size' && Array.isArray(context)) {
        return context.length;
      }

      throw {
        name: 'NullPointerException',
        message: "Property '" + propertyName + "' does not exist.",
      };
    } else if (context[propertyName] === undefined) {
      return null;
    }

    return context[propertyName];
  };

  node.setValue = function (value, state) {
    var context = state.activeContext.peek();

    if (!context) {
      throw {
        name: 'ContextDoesNotExistException',
        message: "Attempting to assign property '" + propertyName + "' for an undefined context.",
      };
    }

    /*jshint -W093 */
    return (context[propertyName] = value);
    /*jshint +W093 */
  };

  node.getName = function () {
    return propertyName;
  };

  return node;
}

export var PropertyReference = {
  create: createNode,
};