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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.ast;

import org.mvel2.ParserContext;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolver;
import org.mvel2.integration.VariableResolverFactory;
import org.mvel2.math.MathProcessor;
import org.mvel2.util.ParseTools;

import static org.mvel2.MVEL.eval;
import static org.mvel2.util.ParseTools.subCompileExpression;

public class OperativeAssign extends ASTNode {
  private String varName;
  private ExecutableStatement statement;
  private final int operation;
  private int knownInType = -1;

  public OperativeAssign(String variableName, char[] expr, int start, int offset, int operation, int fields, ParserContext pCtx) {
    super(pCtx);
    this.varName = variableName;
    this.operation = operation;
    this.expr = expr;
    this.start = start;
    this.offset = offset;

    if ((fields & COMPILE_IMMEDIATE) != 0) {
      egressType = (statement = (ExecutableStatement) subCompileExpression(expr, start, offset, pCtx)).getKnownEgressType();

      if (pCtx.isStrongTyping()) {
        knownInType = ParseTools.__resolveType(egressType);
      }

      if (!pCtx.hasVarOrInput(varName)) {
        pCtx.addInput(varName, egressType);
      }
    }
  }

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    VariableResolver resolver = factory.getVariableResolver(varName);
    resolver.setValue(ctx = checkAssignGlobalVariable(ctx, varName, MathProcessor.doOperations(resolver.getValue(), operation, knownInType, statement.getValue(ctx, thisValue, factory))));
    return ctx;
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    VariableResolver resolver = factory.getVariableResolver(varName);
    resolver.setValue(ctx = checkAssignGlobalVariable(ctx, varName, MathProcessor.doOperations(resolver.getValue(), operation, eval(expr, start, offset, ctx, factory))));
    return ctx;
  }
}