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With inspiration from other libraries

There is a newer version: 2.12.15

/**
 * MVEL (The MVFLEX Expression Language)
 *
 * Copyright (C) 2007 Christopher Brock, MVFLEX/Valhalla Project and the Codehaus
 *
 * 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.optimizers.impl.refl.nodes;

import org.mvel2.compiler.AccessorNode;
import org.mvel2.integration.VariableResolverFactory;

public class VariableAccessor implements AccessorNode {
  private AccessorNode nextNode;
  private String property;

  public VariableAccessor(String property) {
    this.property = property;
  }

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory vrf) {
    if (vrf == null)
      throw new RuntimeException("cannot access property in optimized accessor: " + property);

    if (nextNode != null) {
      return nextNode.getValue(vrf.getVariableResolver(property).getValue(), elCtx, vrf);
    }
    else {
      return vrf.getVariableResolver(property).getValue();
    }
  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
    if (nextNode != null) {
      return nextNode.setValue(variableFactory.getVariableResolver(property).getValue(), elCtx, variableFactory, value);
    }
    else {
      variableFactory.getVariableResolver(property).setValue(value);
    }

    return value;
  }

  public Object getProperty() {
    return property;
  }

  public void setProperty(String property) {
    this.property = property;
  }

  public AccessorNode getNextNode() {
    return nextNode;
  }

  public AccessorNode setNextNode(AccessorNode nextNode) {
    return this.nextNode = nextNode;
  }

  public Class getKnownEgressType() {
    return Object.class;
  }
}