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

import java.io.Serializable;

import static org.mvel2.util.ParseTools.subset;

public abstract class Node implements Serializable {
  protected String name;
  protected char[] contents;
  protected int begin;
  protected int cStart;
  protected int cEnd;
  protected int end;
  public Node next;
  protected Node terminus;

  public Node() {
  }

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

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

  public abstract Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory);

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public char[] getContents() {
    return contents;
  }

  public void setContents(char[] contents) {
    this.contents = contents;
  }

  public int getBegin() {
    return begin;
  }

  public void setBegin(int begin) {
    this.begin = begin;
  }

  public int getEnd() {
    return end;
  }

  public void setEnd(int end) {
    this.end = end;
  }

  public int getCStart() {
    return cStart;
  }

  public void setCStart(int cStart) {
    this.cStart = cStart;
  }

  public int getCEnd() {
    return cEnd;
  }

  public void setCEnd(int cEnd) {
    this.cEnd = cEnd;
  }

  public boolean isOpenNode() {
    return false;
  }

  public abstract boolean demarcate(Node terminatingNode, char[] template);

  public Node getNext() {
    return next;
  }

  public Node setNext(Node next) {
    return this.next = next;
  }

  public Node getTerminus() {
    return terminus;
  }

  public void setTerminus(Node terminus) {
    this.terminus = terminus;
  }

  public void calculateContents(char[] template) {
    this.contents = subset(template, cStart, end - cStart);
  }

  public int getLength() {
    return this.end - this.begin;
  }
}