/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.servicecomb.swagger.invocation.converter.impl;

import java.lang.reflect.Array;
import java.util.Collection;

import org.apache.servicecomb.swagger.invocation.converter.Converter;

public class SameElementCollectionToArray implements Converter {
  private Class<?> elementCls;

  public SameElementCollectionToArray(Class<?> elementCls) {
    this.elementCls = elementCls;
  }

  @Override
  public Object convert(Object value) {
    if (value == null) {
      return null;
    }

    @SuppressWarnings("unchecked")
    Collection<Object> collection = (Collection<Object>) value;
    Object array = Array.newInstance(elementCls, collection.size());
    return collection.toArray((Object[]) array);
  }
}
