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/*
 * Copyright (C) 2014-2016 LinkedIn Corp. All rights reserved.
 *
 * 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.
 */

package gobblin.metrics;

import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;

import com.google.common.base.Preconditions;
import com.google.common.base.Joiner;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableMap;
import com.google.common.collect.Maps;


/**
 * A base implementation of {@link Taggable}.
 *
 * @author Yinan Li
 */
public class Tagged implements Taggable {

  protected final Map tags;

  public Tagged() {
    this.tags = Maps.newLinkedHashMap();
  }

  public Tagged(Collection> tags) {
    this.tags = Maps.newLinkedHashMap();
    addTags(tags);
  }

  @Override
  public void addTag(Tag tag) {
    Preconditions.checkNotNull(tag, "Cannot add a null Tag");
    Preconditions.checkNotNull(tag.getValue(), "Cannot add a Tag with a null value. Tag: " + tag);
    this.tags.put(tag.getKey(), tag.getValue());
  }

  @Override
  public void addTags(Collection> tags) {
    for (Tag tag : tags) {
      addTag(tag);
    }
  }

  @Override
  public List> getTags() {
    ImmutableList.Builder> builder = ImmutableList.builder();
    for (Map.Entry entry : this.tags.entrySet()) {
      builder.add(new Tag