all files / src/ast/ Projection.js

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/*
 * 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 { SpelNode } from './SpelNode';
 
/**
 * Represents projection, where a given operation is performed on all elements in some
 * input sequence, returning a new sequence of the same size. For example:
 * "{1,2,3,4,5,6,7,8,9,10}.!{#isEven(#this)}" returns "[n, y, n, y, n, y, n, y, n, y]"
 *
 * @author Andy Clement
 * @author Mark Fisher
 * @author Ben March
 * @since 0.2.0
 */
 
function projectCollection(collection, expr, state) {
  return collection.map(function (element) {
    var matches;
    state.activeContext.push(element);
    matches = expr.getValue(state);
    state.activeContext.pop();
    return matches;
  });
}
 
function createNode(nullSafeNavigation, position, expr) {
  var node = SpelNode.create('projection', position, expr);
 
  node.getValue = function (state) {
    var collection = state.activeContext.peek(),
      entries = [],
      key;
 
    if (Array.isArray(collection)) {
      return projectCollection(collection, expr, state);
    } else Eif (typeof collection === 'object') {
      for (key in collection) {
        if (Ecollection.hasOwnProperty(key)) {
          entries.push(collection[key]);
        }
      }
      return projectCollection(entries, expr, state);
    }
 
    return null;
  };
 
  return node;
}
 
export var Projection = {
  create: createNode,
};