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/*
* Copyright 2018, 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.metrics;
import com.google.auto.value.AutoValue;
import io.opencensus.common.ExperimentalApi;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
/**
* The value of a {@code Label} associated with a {@code TimeSeries}.
*
* @since 0.15
*/
@ExperimentalApi
@Immutable
@AutoValue
public abstract class LabelValue {
LabelValue() {}
/**
* Creates a {@link LabelValue}.
*
* @param value the value of a {@code Label}. {@code null} value indicates an unset {@code
* LabelValue}.
* @return a {@code LabelValue}.
* @since 0.15
*/
public static LabelValue create(@Nullable String value) {
return new AutoValue_LabelValue(value);
}
/**
* Returns the value of this {@link LabelValue}. Returns {@code null} if the value is unset and
* supposed to be ignored.
*
* @return the value.
* @since 0.15
*/
@Nullable
public abstract String getValue();
}
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