/*
* 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
};
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