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/*
 * Copyright 2013 the original author or authors.
 *
 * 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.modelmapper.internal.valueaccess;

import java.util.Collection;
import java.util.Map;

import org.modelmapper.spi.ValueReader;

/**
 * Handles reading from java.util.Map instances.
 * 
 * @author Jonathan Halterman
 */
public class MapValueReader implements ValueReader> {
  public Object get(Map source, String memberName) {
    if (!source.containsKey(memberName))
      return null;
    return source.get(memberName);
  }

  @SuppressWarnings("unchecked")
  public Member> getMember(Map source, String memberName) {
    final Object value = get(source, memberName);

    if (value == null) {
      return null;
    }
    if (value instanceof Map) {
      return new Member>(this, Map.class, (Map) value);
    }

    return new Member>(this, value.getClass());
  }

  public Collection memberNames(Map source) {
    return source.keySet();
  }

}