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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.integration.impl;

import org.mvel2.integration.VariableResolver;

public class IndexVariableResolver implements VariableResolver {
  private int indexPos;
  private Object[] vars;

  public IndexVariableResolver(int indexPos, Object[] vars) {
    this.indexPos = indexPos;
    this.vars = vars;
  }

  public String getName() {
    return null;
  }

  public Class getType() {
    return null;
  }

  public void setStaticType(Class type) {
  }

  public int getFlags() {
    return 0;
  }

  public Object getValue() {
    return vars[indexPos];
  }

  public void setValue(Object value) {
    vars[indexPos] = value;
  }
}