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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;

import java.util.Map;

public class MapAccessor implements AccessorNode {
  private AccessorNode nextNode;
  private Object property;

  public MapAccessor() {
  }

  public MapAccessor(Object property) {
    this.property = property;
  }

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory vrf) {
    if (nextNode != null) {
      return nextNode.getValue(((Map) ctx).get(property), elCtx, vrf);
    }
    else {
      return ((Map) ctx).get(property);
    }
  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory vars, Object value) {
    if (nextNode != null) {
      return nextNode.setValue(((Map) ctx).get(property), elCtx, vars, value);
    }
    else {
      //noinspection unchecked
      ((Map) ctx).put(property, value);
      return value;
    }
  }

  public Object getProperty() {
    return property;
  }

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

  public AccessorNode getNextNode() {
    return nextNode;
  }

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

  public String toString() {
    return "Map Accessor -> [" + property + "]";
  }

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