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/**
 * Copyright © 2013 Sven Ruppert ([email protected])
 *
 * 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 repacked.com.google.common.collect;


import repacked.com.google.common.base.Function;
import repacked.com.google.common.base.Predicate;

import java.util.Collection;
import java.util.Iterator;

/**
 * Copyright (C) 2010 RapidPM
 * 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.
 * 
 * Created by RapidPM - Team on 19.09.16.
 */
public class Iterables {


  private Iterables() {
  }


  public static  Iterable filter(
      final Iterable unfiltered ,
      final Predicate retainIfTrue) {

    if (unfiltered == null || retainIfTrue == null) throw new NullPointerException();
    return new FluentIterable() {
      @Override
      public Iterator iterator() {
        return Iterators.filter(unfiltered.iterator() , retainIfTrue);
      }
    };
  }


  public static  Iterable concat(Iterable a , Iterable b) {
    return FluentIterable.concat(a , b);
  }


  public static  Iterable concat(Iterable> inputs) {
    return FluentIterable.concat(inputs);
  }


  public static  boolean isEmpty(final Iterable iterable) {
    if (iterable instanceof Collection) {
      return ((Collection) iterable).isEmpty();
    }
    return ! iterable.iterator().hasNext();
  }

  public static  T getOnlyElement(final Iterable iterable) {
    final Iterator iterator = iterable.iterator();
    return Iterators.getOnlyElement(iterator);
  }

  public static  boolean any(Iterable iterable , Predicate predicate) {
    return Iterators.any(iterable.iterator() , predicate);
  }

  public static boolean contains(final Iterable iterable , final Object element) {
    if (iterable instanceof Collection) {
      Collection collection = (Collection) iterable;
      return Collections2.safeContains(collection , element);
    }
    return Iterators.contains(iterable.iterator() , element);
  }

  public static  Iterable transform(
      final Iterable fromIterable , final Function function) {
    return new FluentIterable() {
      @Override
      public Iterator iterator() {
        return Iterators.transform(fromIterable.iterator() , function);
      }
    };
  }

  public static  Iterable limit(final Iterable iterable , final int limitSize) {
    return new FluentIterable() {
      @Override
      public Iterator iterator() {
        return Iterators.limit(iterable.iterator() , limitSize);
      }
    };
  }
}