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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.ParserContext;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.templates.CompiledTemplate;
import org.mvel2.templates.SimpleTemplateRegistry;
import org.mvel2.templates.TemplateRuntime;
import org.mvel2.templates.util.TemplateOutputStream;

import java.io.Serializable;

public class CompiledDeclareNode extends Node {
  private Node nestedNode;
  private Serializable ce;

  public CompiledDeclareNode(int begin, String name, char[] template, int start, int end, ParserContext context) {
    this.begin = begin;
    this.name = name;
    this.contents = template;
    this.cStart = start;
    this.cEnd = end - 1;
    this.end = end;
    ce = MVEL.compileExpression(template, cStart, cEnd - cStart, context);
    //  ce = MVEL.compileExpression(this.contents = subset(template, this.cStart = start, (this.end = this.cEnd = end) - start - 1), context);
  }

  public Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory) {
    if (runtime.getNamedTemplateRegistry() == null) {
      runtime.setNamedTemplateRegistry(new SimpleTemplateRegistry());
    }

    runtime.getNamedTemplateRegistry()
        .addNamedTemplate(MVEL.executeExpression(ce, ctx, factory, String.class),
            new CompiledTemplate(runtime.getTemplate(), nestedNode));

    return next != null ? next.eval(runtime, appender, ctx, factory) : null;
  }

  public boolean demarcate(Node terminatingNode, char[] template) {
    Node n = nestedNode = next;

    while (n.getNext() != null) n = n.next;

    n.next = new EndNode();

    next = terminus;
    return false;
  }
}