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/*
* Copyright 2017, OpenCensus Authors
*
* 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 io.opencensus.implcore.tags;
import io.opencensus.tags.Tag;
import io.opencensus.tags.TagContext;
import io.opencensus.tags.TagKey;
import io.opencensus.tags.TagValue;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Map.Entry;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
@Immutable
public final class TagContextImpl extends TagContext {
public static final TagContextImpl EMPTY =
new TagContextImpl(Collections.<TagKey, TagValue>emptyMap());
// The types of the TagKey and value must match for each entry.
private final Map<TagKey, TagValue> tags;
public TagContextImpl(Map<? extends TagKey, ? extends TagValue> tags) {
this.tags = Collections.unmodifiableMap(new HashMap<TagKey, TagValue>(tags));
}
public Map<TagKey, TagValue> getTags() {
return tags;
}
@Override
protected Iterator<Tag> getIterator() {
return new TagIterator(tags);
}
@Override
public boolean equals(@Nullable Object other) {
// Directly compare the tags when both objects are TagContextImpls, for efficiency.
if (other instanceof TagContextImpl) {
return getTags().equals(((TagContextImpl) other).getTags());
}
return super.equals(other);
}
private static final class TagIterator implements Iterator<Tag> {
Iterator<Map.Entry<TagKey, TagValue>> iterator;
TagIterator(Map<TagKey, TagValue> tags) {
iterator = tags.entrySet().iterator();
}
@Override
public boolean hasNext() {
return iterator.hasNext();
}
@Override
public Tag next() {
final Entry<TagKey, TagValue> next = iterator.next();
return Tag.create(next.getKey(), next.getValue());
}
@Override
public void remove() {
throw new UnsupportedOperationException("TagIterator.remove()");
}
}
}
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