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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.integration.impl;

import org.mvel2.ScriptRuntimeException;
import org.mvel2.UnresolveablePropertyException;
import org.mvel2.integration.VariableResolver;
import org.mvel2.integration.VariableResolverFactory;

import java.util.Set;

public class ImmutableDefaultFactory implements VariableResolverFactory {
  private boolean tiltFlag;
  private boolean breakFlag;

  private void throwError() {
    throw new ScriptRuntimeException("cannot assign variables; no variable resolver factory available.");
  }

  public VariableResolver createVariable(String name, Object value) {
    throwError();
    return null;
  }

  public VariableResolver createIndexedVariable(int index, String name, Object value) {
    throwError();
    return null;
  }

  public VariableResolver createVariable(String name, Object value, Class type) {
    throwError();
    return null;
  }

  public VariableResolver createIndexedVariable(int index, String name, Object value, Class typee) {
    throwError();
    return null;
  }

  public VariableResolver setIndexedVariableResolver(int index, VariableResolver variableResolver) {
    throwError();
    return null;
  }

  public VariableResolverFactory getNextFactory() {
    return null;
  }

  public VariableResolverFactory setNextFactory(VariableResolverFactory resolverFactory) {
    throw new RuntimeException("cannot chain to this factory");
  }

  public VariableResolver getVariableResolver(String name) {
    throw new UnresolveablePropertyException(name);
  }

  public VariableResolver getIndexedVariableResolver(int index) {
    throwError();
    return null;
  }

  public boolean isTarget(String name) {
    return false;
  }

  public boolean isResolveable(String name) {
    return false;
  }

  public Set getKnownVariables() {
    return null;
  }

  public int variableIndexOf(String name) {
    return -1;
  }

  public boolean isIndexedFactory() {
    return false;
  }

  public boolean tiltFlag() {
    return tiltFlag;
  }

  public void setTiltFlag(boolean tilt) {
    this.tiltFlag = tilt;
  }

  @Override
  public boolean breakFlag() {
    return breakFlag;
  }

  @Override
  public void setBreakFlag(boolean breakFlag) {
    this.breakFlag = breakFlag;
  }
}