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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.MVEL;
import org.mvel2.ParserContext;
import org.mvel2.compiler.ExecutableStatement;
import org.mvel2.integration.VariableResolverFactory;

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

public class Substatement extends ASTNode {
  private ExecutableStatement statement;

  public Substatement(char[] expr, int start, int offset, int fields, ParserContext pCtx) {
    super(pCtx);
    this.expr = expr;
    this.start = start;
    this.offset = offset;

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

  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return statement.getValue(ctx, thisValue, factory);
  }

  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return MVEL.eval(this.expr, start, offset, ctx, factory);
  }


  public ExecutableStatement getStatement() {
    return statement;
  }

  public String toString() {
    return statement == null ? "(" + new String(expr, start, offset) + ")" : statement.toString();
  }

}