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/**
 * Copyright (C) 2011 Brian Ferris 
 *
 * 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.onebusaway.collections.adapter;

import java.io.Serializable;
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;

public class AdapterLibrary {

  public static final  TO apply(IAdapter adapter, FROM value) {
    if (value == null)
      return null;
    return adapter.adapt(value);
  }

  public static  IAdapter getIdentityAdapter(Class type) {
    return new IdentityAdapter();
  }

  public static  Iterable adapt(Iterable source,
      IAdapter adapter) {
    return new IterableAdapter(source, adapter);
  }

  public static  Iterator adaptIterator(Iterator source,
      IAdapter adapter) {
    return new IteratorAdapter(source, adapter);
  }

  public static  Collection adaptCollection(
      Collection source, IAdapter adapter) {
    return new AdaptableCollection(source, adapter);
  }

  public static  Set adaptSet(Set source,
      IAdapter adapter) {
    return new AdaptableSet(source, adapter);
  }

  public static  Map.Entry adaptMapEntry(
      Map.Entry source, IAdapter adapter) {
    return new AdaptableValueMapEntry(source,
        adapter);
  }

  public static  SortedMap adaptSortedMap(
      SortedMap source, IAdapter adapter) {
    return new AdaptableValueSortedMap(source,
        adapter);
  }

  /*****************************************************************************
   * 
   ****************************************************************************/

  private static final class IdentityAdapter implements IAdapter,
      Serializable {

    private static final long serialVersionUID = 1L;

    public T adapt(T source) {
      return source;
    }
  }

}