node-red-nodes/function/rbe/rbe.js

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/**
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* Copyright 2014, 2015 IBM Corp.
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*
* 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.
**/
module.exports = function(RED) {
"use strict";
function RbeNode(n) {
RED.nodes.createNode(this,n);
this.func = n.func || "rbe";
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this.gap = n.gap || "0";
this.pc = false;
if (this.gap.substr(-1) === "%") {
this.pc = true;
this.gap = parseFloat(this.gap);
}
this.g = this.gap;
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var node = this;
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node.previous = {};
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this.on("input",function(msg) {
if (msg.hasOwnProperty("payload")) {
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var t = msg.topic || "_no_topic";
if (this.func === "rbe") {
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if (msg.payload != node.previous[t]) {
node.previous[t] = msg.payload;
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node.send(msg);
}
}
else {
var n = parseFloat(msg.payload);
if (!isNaN(n)) {
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if (node.pc) { node.gap = (node.previous[t] * node.g / 100) || 0; }
if (!node.previous.hasOwnProperty(t)) { node.previous[t] = n - node.gap; }
if (Math.abs(n - node.previous[t]) >= node.gap) {
node.previous[t] = n;
node.send(msg);
}
}
else {
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node.warn(RED._("rbe.warn.nonumber"));
}
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}
} // ignore msg with no payload property.
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});
}
RED.nodes.registerType("rbe",RbeNode);
}