/*
 * Copyright (C) 2013 The Android Open Source Project
 *
 * 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.android.sched.util.log.stats;

import com.google.common.collect.Iterators;

import com.android.sched.util.table.DataRow;

import java.util.Iterator;

import javax.annotation.Nonnegative;
import javax.annotation.Nonnull;

/**
 * Represents a statistic on array allocation.
 */
public class ArrayAllocImpl extends ArrayAlloc implements DataRow {
  @Nonnegative
  private long number;
  @Nonnull
  private final SampleImpl element;
  @Nonnegative
  private long size;

  protected ArrayAllocImpl(@Nonnull StatisticId<? extends Statistic> id) {
    super(id);

    element = new SampleImpl(id);
  }

  /**
   * Record an array allocation.
   *
   * @param count number of element if it is an array.
   * @param size size in bytes of object in memory.
   */
  @Override
  public synchronized void recordObjectAllocation(@Nonnegative int count, @Nonnegative long size) {
    this.number++;
    this.size += size;
    this.element.add(count, null);
  }

  @Override
  public synchronized void merge(@Nonnull Statistic statistic) {
    ArrayAllocImpl stat = (ArrayAllocImpl) statistic;

    synchronized (stat) {
      this.number += stat.number;
      this.size   += stat.size;
      this.element.merge(stat.element);
    }
  }

  @Override
  @Nonnull
  public synchronized Iterator<Object> iterator() {
    return Iterators.concat(
        Iterators.forArray(Long.valueOf(number), Long.valueOf(size)), element.iterator());
  }
}