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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.collection;

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

import java.util.HashMap;
import java.util.Map;

/**
 * @author Christopher Brock
 */
public class MapCreator implements Accessor {
  private Accessor[] keys;
  private Accessor[] vals;
  private int size;

  public Object getValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory) {
    Map map = new HashMap(size * 2);
    for (int i = size - 1; i != -1; i--) {
      //noinspection unchecked
      map.put(keys[i].getValue(ctx, elCtx, variableFactory), vals[i].getValue(ctx, elCtx, variableFactory));
    }
    return map;
  }

  public MapCreator(Accessor[] keys, Accessor[] vals) {
    this.size = (this.keys = keys).length;
    this.vals = vals;
  }

  public Object setValue(Object ctx, Object elCtx, VariableResolverFactory variableFactory, Object value) {
    // not implemented
    return null;
  }

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