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Swirlds is a software platform designed to build fully-distributed applications that harness the power of the cloud without servers. Now you can develop applications with fairness in decision making, speed, trust and reliability, at a fraction of the cost of traditional server-based platforms.
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/*
* Copyright (C) 2022-2024 Hedera Hashgraph, LLC
*
* 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 com.swirlds.config.api;
import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import java.util.Collection;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Set;
import java.util.stream.Stream;
/**
* Central interface to provide configuration properties. The API provides different methods how properties can be
* accessed.
*/
public interface Configuration {
/**
* A constant that can be used to define an empty list.
*/
String EMPTY_LIST = "[]";
/**
* Returns a {@link Stream} of all available property names.
*
* @return the stream of all property names
*/
@NonNull
Stream getPropertyNames();
/**
* Checks if a property with the given name exists and returns true in that case.
*
* @param propertyName the name of the property that should be checked
* @return true if the property exists, false otherwise
*/
boolean exists(@NonNull String propertyName);
/**
* Returns the {@link String} value of the property with the given name.
*
* @param propertyName the name of the property
* @return the value of the property
* @throws NoSuchElementException if the property does not exist.
*/
@Nullable
String getValue(@NonNull String propertyName) throws NoSuchElementException;
/**
* Returns the {@link String} value of the property with the given name or the given default value if the property
* does not exist.
*
* @param propertyName the name of the property
* @param defaultValue the default value that will be used if the property does not exist.
* @return the value of the property or the given default value if the property does not exist
*/
@Nullable
String getValue(@NonNull String propertyName, @Nullable String defaultValue);
/**
* Returns the value of the property with the given name.
*
* @param propertyName the name of the property
* @param propertyType the type of the property
* @param the generic type of the property
* @return the value of the property
* @throws NoSuchElementException if the property does not exist.
* @throws IllegalArgumentException if the raw {@code String} value of the property can not be converted to the
* given type
*/
@Nullable
T getValue(@NonNull String propertyName, @NonNull Class propertyType)
throws NoSuchElementException, IllegalArgumentException;
/**
* Returns the value of the property with the given name or the given default value if the property does not exist.
*
* @param propertyName the name of the property
* @param propertyType the type of the property
* @param defaultValue the default value that will be used if the property does not exist.
* @param the generic type of the property
* @return the value of the property or the given default value if the property does not exist
* @throws IllegalArgumentException if the raw {@code String} value of the property can not be converted to the
* given type
*/
@Nullable
T getValue(@NonNull String propertyName, @NonNull Class propertyType, @Nullable T defaultValue)
throws IllegalArgumentException;
/**
* Returns a {@link List} of string elements of the property with the given name.
*
* @param propertyName the name of the property
* @return a {@link List} of elements of the property with the given name
* @throws NoSuchElementException if the property does not exist
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a list
* or the given type
*/
@Nullable
List getValues(@NonNull String propertyName);
/**
* Returns a {@link List} of string elements of the property with the given name or the given default {@link List}.
*
* @param propertyName the name of the property
* @param defaultValue the default {@link List}
* @return a {@link List} of elements of the property with the given name
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a list
* or the given type
*/
@Nullable
List getValues(@NonNull String propertyName, @Nullable List defaultValue);
/**
* Returns a {@link List} of elements of the property with the given name.
*
* @param propertyName the name of the property
* @param propertyType the type of the elements
* @param the generic type of the elements
* @return a {@link List} of elements of the property with the given name
* @throws NoSuchElementException if the property does not exist
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a list
* or the given type
*/
@Nullable
List getValues(@NonNull String propertyName, @NonNull Class propertyType)
throws NoSuchElementException, IllegalArgumentException;
/**
* Returns a {@link List} of elements of the property with the given name or the given default {@link List}.
*
* @param propertyName the name of the property
* @param propertyType the type of the elements
* @param defaultValue the default {@link List}
* @param the generic type of the elements
* @return a {@link List} of elements of the property with the given name or the given default list
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a list
* or the given type
*/
@Nullable
List getValues(@NonNull String propertyName, @NonNull Class propertyType, @Nullable List defaultValue)
throws IllegalArgumentException;
/**
* Returns a {@link Set} of string elements of the property with the given name.
*
* @param propertyName the name of the property
* @return a {@link Set} of elements of the property with the given name
* @throws NoSuchElementException if the property does not exist.
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a set or
* the given type
*/
@Nullable
Set getValueSet(@NonNull String propertyName);
/**
* Returns a {@link Set} of string elements of the property with the given name or the given default {@link Set}.
*
* @param propertyName the name of the property
* @param defaultValue the default {@link Set}
* @return a {@link Set} of elements of the property with the given name
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a set or
* the given type
*/
@Nullable
Set getValueSet(@NonNull String propertyName, @Nullable Set defaultValue);
/**
* Returns a {@link Set} of elements of the property with the given name.
*
* @param propertyName the name of the property
* @param propertyType the type of the elements
* @param the generic type of the elements
* @return a {@link Set} of elements of the property with the given name
* @throws NoSuchElementException if the property does not exist.
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a set or
* the given type
*/
@Nullable
Set getValueSet(@NonNull String propertyName, @NonNull Class propertyType)
throws NoSuchElementException, IllegalArgumentException;
/**
* Returns a {@link Set} of elements of the property with the given name or the given default {@link Set}.
*
* @param propertyName the name of the property
* @param propertyType the type of the elements
* @param defaultValue the default {@link Set}
* @param the generic type of the elements
* @return a {@link Set} of elements of the property with the given name or the given default set
* @throws IllegalArgumentException if the raw {@link String} value of the property can not be converted to a set or
* the given type
*/
@Nullable
Set getValueSet(@NonNull String propertyName, @NonNull Class propertyType, @Nullable Set defaultValue)
throws IllegalArgumentException;
/**
* Returns a config data object of the given type. This is used to provide an object-oriented construct for
* accessing config properties for a specific usecase. By doing so all configuration values for a specific service
* can for example be stored in an immutable record instance that is used to access the values.
*
* The given type defines the {@link Record} that defines the config properties. The annotations {@link ConfigData}
* and {@link ConfigProperty} can be used in the record definition to specify the names and default values of
* properties.The result of this method is an instance of the given {@link Record} that provides the values for all
* properties that are specified in the record definition.
*
* @param type type of the record
* @param type of the record
* @return instance of the record that contains the config values for all config properties that are defined in the
* record definition.
*/
@NonNull
T getConfigData(@NonNull Class type);
/**
* Returns all types that are registered as config data types (see {@link #getConfigData(Class)}).
*
* @return all types that are registered as config data types
*/
@NonNull
Collection> getConfigDataTypes();
}