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/*
* Copyright 2016-17, 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.trace;
import com.google.auto.value.AutoValue;
import io.opencensus.common.Function;
import io.opencensus.internal.Utils;
import javax.annotation.concurrent.Immutable;
/**
* A class that represents all the possible values for an attribute. An attribute can have 3 types
* of values: {@code String}, {@code Boolean} or {@code Long}.
*
* @since 0.5
*/
@Immutable
public abstract class AttributeValue {
/**
* Returns an {@code AttributeValue} with a string value.
*
* @param stringValue The new value.
* @return an {@code AttributeValue} with a string value.
* @throws NullPointerException if {@code stringValue} is {@code null}.
* @since 0.5
*/
public static AttributeValue stringAttributeValue(String stringValue) {
return AttributeValueString.create(stringValue);
}
/**
* Returns an {@code AttributeValue} with a boolean value.
*
* @param booleanValue The new value.
* @return an {@code AttributeValue} with a boolean value.
* @since 0.5
*/
public static AttributeValue booleanAttributeValue(boolean booleanValue) {
return AttributeValueBoolean.create(booleanValue);
}
/**
* Returns an {@code AttributeValue} with a long value.
*
* @param longValue The new value.
* @return an {@code AttributeValue} with a long value.
* @since 0.5
*/
public static AttributeValue longAttributeValue(long longValue) {
return AttributeValueLong.create(longValue);
}
/**
* Returns an {@code AttributeValue} with a double value.
*
* @param doubleValue The new value.
* @return an {@code AttributeValue} with a double value.
* @since 0.17
*/
public static AttributeValue doubleAttributeValue(double doubleValue) {
return AttributeValueDouble.create(doubleValue);
}
AttributeValue() {}
/**
* Applies a function to the underlying value. The function that is called depends on the value's
* type, which can be {@code String}, {@code Long}, or {@code Boolean}.
*
* @param stringFunction the function that should be applied if the value has type {@code String}.
* @param longFunction the function that should be applied if the value has type {@code Long}.
* @param booleanFunction the function that should be applied if the value has type {@code
* Boolean}.
* @param defaultFunction the function that should be applied if the value has a type that was
* added after this {@code match} method was added to the API. See {@link
* io.opencensus.common.Functions} for some common functions for handling unknown types.
* @return the result of the function applied to the underlying value.
* @since 0.5
* @deprecated in favor of {@link #match(Function, Function, Function, Function, Function)}.
*/
@Deprecated
public abstract T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function defaultFunction);
/**
* Applies a function to the underlying value. The function that is called depends on the value's
* type, which can be {@code String}, {@code Long}, or {@code Boolean}.
*
* @param stringFunction the function that should be applied if the value has type {@code String}.
* @param longFunction the function that should be applied if the value has type {@code Long}.
* @param booleanFunction the function that should be applied if the value has type {@code
* Boolean}.
* @param doubleFunction the function that should be applied if the value has type {@code Double}.
* @param defaultFunction the function that should be applied if the value has a type that was
* added after this {@code match} method was added to the API. See {@link
* io.opencensus.common.Functions} for some common functions for handling unknown types.
* @return the result of the function applied to the underlying value.
* @since 0.17
*/
@SuppressWarnings("InconsistentOverloads")
public abstract T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function doubleFunction,
Function defaultFunction);
@Immutable
@AutoValue
abstract static class AttributeValueString extends AttributeValue {
AttributeValueString() {}
static AttributeValue create(String stringValue) {
return new AutoValue_AttributeValue_AttributeValueString(
Utils.checkNotNull(stringValue, "stringValue"));
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function defaultFunction) {
return stringFunction.apply(getStringValue());
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function doubleFunction,
Function defaultFunction) {
return stringFunction.apply(getStringValue());
}
abstract String getStringValue();
}
@Immutable
@AutoValue
abstract static class AttributeValueBoolean extends AttributeValue {
AttributeValueBoolean() {}
static AttributeValue create(Boolean booleanValue) {
return new AutoValue_AttributeValue_AttributeValueBoolean(
Utils.checkNotNull(booleanValue, "booleanValue"));
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function defaultFunction) {
return booleanFunction.apply(getBooleanValue());
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function doubleFunction,
Function defaultFunction) {
return booleanFunction.apply(getBooleanValue());
}
abstract Boolean getBooleanValue();
}
@Immutable
@AutoValue
abstract static class AttributeValueLong extends AttributeValue {
AttributeValueLong() {}
static AttributeValue create(Long longValue) {
return new AutoValue_AttributeValue_AttributeValueLong(
Utils.checkNotNull(longValue, "longValue"));
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function defaultFunction) {
return longFunction.apply(getLongValue());
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function doubleFunction,
Function defaultFunction) {
return longFunction.apply(getLongValue());
}
abstract Long getLongValue();
}
@Immutable
@AutoValue
abstract static class AttributeValueDouble extends AttributeValue {
AttributeValueDouble() {}
static AttributeValue create(Double doubleValue) {
return new AutoValue_AttributeValue_AttributeValueDouble(
Utils.checkNotNull(doubleValue, "doubleValue"));
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function defaultFunction) {
return defaultFunction.apply(getDoubleValue());
}
@Override
public final T match(
Function stringFunction,
Function booleanFunction,
Function longFunction,
Function doubleFunction,
Function defaultFunction) {
return doubleFunction.apply(getDoubleValue());
}
abstract Double getDoubleValue();
}
}
