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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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package org.mvel2.ast;

import org.mvel2.Operator;
import org.mvel2.ParserContext;
import org.mvel2.integration.VariableResolverFactory;

public class IntAdd extends BinaryOperation implements IntOptimized {

  public IntAdd(ASTNode left, ASTNode right, ParserContext pCtx) {
    super(Operator.ADD, pCtx);
    this.left = left;
    this.right = right;
  }

  @Override
  public Object getReducedValueAccelerated(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return ((Integer) left.getReducedValueAccelerated(ctx, thisValue, factory))
        + ((Integer) right.getReducedValueAccelerated(ctx, thisValue, factory));
  }

  @Override
  public Object getReducedValue(Object ctx, Object thisValue, VariableResolverFactory factory) {
    return ((Integer) left.getReducedValue(ctx, thisValue, factory))
        + ((Integer) right.getReducedValue(ctx, thisValue, factory));
  }

  @Override
  public Class getEgressType() {
    return Integer.class;
  }
}