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

import java.lang.reflect.Field;

@SuppressWarnings({"unchecked"})
public class DynamicFieldAccessor implements AccessorNode {
  private AccessorNode nextNode;
  private Field field;
  private Class targetType;

  public DynamicFieldAccessor() {
  }

  public DynamicFieldAccessor(Field field) {
    setField(field);
  }

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory vars) {
    try {
      if (nextNode != null) {
        return nextNode.getValue(field.get(ctx), elCtx, vars);
      }
      else {
        return field.get(ctx);
      }
    }
    catch (Exception e) {
      throw new RuntimeException("unable to access field", e);
    }

  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
    try {
      if (nextNode != null) {
        return nextNode.setValue(field.get(ctx), elCtx, variableFactory, value);
      }
      else {
        field.set(ctx, DataConversion.convert(value, targetType));
        return value;
      }
    }
    catch (Exception e) {
      throw new RuntimeException("unable to access field", e);
    }
  }

  public Field getField() {
    return field;
  }

  public void setField(Field field) {
    this.field = field;
    this.targetType = field.getType();
  }

  public AccessorNode getNextNode() {
    return nextNode;
  }

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

  public Class getKnownEgressType() {
    return targetType;
  }
}