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Module contains external API of the evitaDB.
/*
*
* _ _ ____ ____
* _____ _(_) |_ __ _| _ \| __ )
* / _ \ \ / / | __/ _` | | | | _ \
* | __/\ V /| | || (_| | |_| | |_) |
* \___| \_/ |_|\__\__,_|____/|____/
*
* Copyright (c) 2023-2024
*
* Licensed under the Business Source License, Version 1.1 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://github.com/FgForrest/evitaDB/blob/master/LICENSE
*
* 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.evitadb.api.proxy.impl;
import javax.annotation.Nonnull;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Locale;
import java.util.Optional;
import java.util.OptionalInt;
import java.util.function.Predicate;
import static java.util.Optional.empty;
import static java.util.Optional.of;
/**
* The MethodArgumentsParser class provides a static method for parsing method arguments and returning the parsed
* arguments as an optional {@link ParsedArguments} object.
*
* @author Jan Novotný ([email protected]), FG Forrest a.s. (c) 2023
*/
public class MethodArgumentsParser {
/**
* Parses the arguments of a method to identify the position of the value parameter and locale parameter (if any).
*
* @param method The method to parse the arguments for.
* @param supportedTypePredicate The predicate to determine if a parameter type is supported.
* @return An Optional containing the parsed arguments or empty if the method arguments doesn't meet the expectations
*/
@Nonnull
public static Optional parseArguments(
@Nonnull Method method,
@Nonnull Predicate> supportedTypePredicate
) {
final int valueParameterPosition;
final OptionalInt localeParameterPosition;
// We only want to handle methods with exactly one parameter, or two parameters of which one is Locale
final Class[] parameterTypes = method.getParameterTypes();
if (method.getParameterCount() == 1) {
if (supportedTypePredicate.test(parameterTypes[0]) && !Locale.class.isAssignableFrom(parameterTypes[0])) {
valueParameterPosition = 0;
localeParameterPosition = OptionalInt.empty();
} else if (Locale.class.isAssignableFrom(parameterTypes[0])) {
localeParameterPosition = OptionalInt.of(0);
valueParameterPosition = -1;
} else {
localeParameterPosition = OptionalInt.empty();
valueParameterPosition = -1;
}
} else if (method.getParameterCount() == 2 &&
Arrays.stream(parameterTypes)
.allMatch(it -> Locale.class.isAssignableFrom(it) || supportedTypePredicate.test(it))
) {
int lp = -1;
for (int i = 0; i < parameterTypes.length; i++) {
if (Locale.class.isAssignableFrom(parameterTypes[i])) {
lp = i;
break;
}
}
if (lp == -1) {
return empty();
} else {
localeParameterPosition = OptionalInt.of(lp);
valueParameterPosition = lp == 0 ? 1 : 0;
}
} else {
localeParameterPosition = OptionalInt.empty();
valueParameterPosition = -1;
}
return of(new ParsedArguments(valueParameterPosition, localeParameterPosition));
}
/**
* Represents parsed arguments of the method.
*
* @param valueParameterPosition index of the value parameter among method parameters
* @param localeParameterPosition index of the {@link Locale} parameter among method parameters (if present)
*/
public record ParsedArguments(
int valueParameterPosition,
@Nonnull OptionalInt localeParameterPosition
) {
}
}