/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 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<String, Object> tags;
public Tagged() {
this.tags = Maps.newLinkedHashMap();
}
public Tagged(Collection<Tag<?>> 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<Tag<?>> tags) {
for (Tag<?> tag : tags) {
addTag(tag);
}
}
@Override
public List<Tag<?>> getTags() {
ImmutableList.Builder<Tag<?>> builder = ImmutableList.builder();
for (Map.Entry<String, Object> entry : this.tags.entrySet()) {
builder.add(new Tag<Object>(entry.getKey(), entry.getValue()));
}
return builder.build();
}
/**
* Return tags as a Map.
* @return map of tags.
*/
public Map<String, Object> getTagMap() {
return ImmutableMap.copyOf(this.tags);
}
/**
* Get a metric name constructed from the {@link Tag}s.
*/
@Override
public String metricNamePrefix(boolean includeTagKeys) {
return Joiner.on('.').join(includeTagKeys ? getTags() : this.tags.values());
}
}