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TBEL is a powerful expression language for ThingsBoard platform user-defined functions. Original implementation is based on MVEL.

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/**
 * MVEL 2.0
 * Copyright (C) 2007 The Codehaus
 * Mike Brock, Dhanji Prasanna, John Graham, Mark Proctor
 *
 * 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.
 */

package org.mvel2.templates.res;

import org.mvel2.MVEL;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.util.TemplateOutputStream;

import static java.lang.String.valueOf;

public class EvalNode extends Node {
  public EvalNode() {
  }

  public EvalNode(int begin, String name, char[] template, int start, int end) {
    this.begin = begin;
    this.name = name;
    this.contents = template;
    this.cStart = start;
    this.cEnd = end - 1;
    this.end = end;
    //   this.contents = subset(template, this.cStart = start, (this.end = this.cEnd = end) - start - 1);
  }

  public EvalNode(int begin, String name, char[] template, int start, int end, Node next) {
    this.name = name;
    this.begin = begin;
    this.contents = template;
    this.cStart = start;
    this.cEnd = end - 1;
    this.end = end;
    //   this.contents = subset(template, this.cStart = start, (this.end = this.cEnd = end) - start - 1);
    this.next = next;
  }

  public Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory) {
    appender.append(String.valueOf(TemplateRuntime.eval(
        valueOf(MVEL.eval(contents, cStart, cEnd - cStart, ctx, factory)), ctx, factory)));
    return next != null ? next.eval(runtime, appender, ctx, factory) : null;
  }

  public boolean demarcate(Node terminatingNode, char[] template) {
    return false;
  }

  public String toString() {
    return "EvalNode:" + name + "{" + (contents == null ? "" : new String(contents, cStart, cEnd - cStart)) + "} (start=" + begin + ";end=" + end + ")";
  }
}