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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;

public class TextNode extends Node {
  public TextNode(int begin, int end) {
    this.begin = begin;
    this.end = end;
  }

  public TextNode(int begin, int end, ExpressionNode next) {
    this.begin = begin;
    this.end = end;
    this.next = next;
  }

  public Object eval(TemplateRuntime runtime, TemplateOutputStream appender, Object ctx, VariableResolverFactory factory) {
    int len = end - begin;
    if (len != 0) {
      appender.append(new String(runtime.getTemplate(), begin, len));
    }
    return next != null ? next.eval(runtime, appender, ctx, factory) : null;
  }

  public String toString() {
    return "TextNode(" + begin + "," + end + ")";
  }

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

  public void calculateContents(char[] template) {
  }
}