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/*
 * Copyright 2011,2012 Metamarkets Group Inc.
 *
 * 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 com.metamx.common.guava;

import com.google.common.collect.Lists;

import java.util.Comparator;
import java.util.Iterator;
import java.util.List;

/**
 */
public class MergeIterable implements Iterable
{
  private final Comparator comparator;
  private final Iterable> baseIterables;

  public MergeIterable(
      Comparator comparator,
      Iterable> baseIterables
  )
  {
    this.comparator = comparator;
    this.baseIterables = baseIterables;
  }

  @Override
  public Iterator iterator()
  {
    List> iterators = Lists.newArrayList();
    for (Iterable baseIterable : baseIterables) {
      iterators.add(baseIterable.iterator());
    }

    return new MergeIterator<>(comparator, iterators);
  }
}