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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  MVFLEX/Valhalla Project and 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;

/**
 * The conversion handler interface defines the basic interface for implementing conversion handlers in MVEL.
 *
 * @see org.mvel2.DataConversion
 */
public interface ConversionHandler {
  /**
   * Converts the passed argument to the type represented by the handler.
   *
   * @param in - the input type
   * @return - the converted type
   */
  public Object convertFrom(Object in);

  /**
   * This method is used to indicate to the runtime whehter or not the handler knows how to convert
   * from the specified type.
   *
   * @param cls - the source type
   * @return - true if the converter supports converting from the specified type.
   */
  public boolean canConvertFrom(Class cls);
}