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/*
 * Hibernate Validator, declare and validate application constraints
 *
 * License: Apache License, Version 2.0
 * See the license.txt file in the root directory or .
 */
package org.hibernate.validator.parameternameprovider;

import java.lang.reflect.Constructor;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import jakarta.validation.ParameterNameProvider;

import com.thoughtworks.paranamer.AdaptiveParanamer;
import com.thoughtworks.paranamer.CachingParanamer;
import com.thoughtworks.paranamer.Paranamer;

import org.hibernate.validator.internal.engine.DefaultParameterNameProvider;

/**
 * A {@link ParameterNameProvider} implementation backed by the ParaNamer
 * library.
 * 

* The {@link Paranamer} implementation to use can be passed when creating a {@code ParanamerParameterNameProvider}. By * default a {@link AdaptiveParanamer} will be used which is wrapped into a {@link CachingParanamer}. If no parameter * names can be obtained from the configured {@code Paranamer}, the default parameter name provider will be used as * fall back. *

* The ParaNamer library must be present on the classpath when using this parameter name provider. * * @author Gunnar Morling * @see ParaNamer web site */ public class ParanamerParameterNameProvider implements ParameterNameProvider { private final ParameterNameProvider fallBackProvider; private final Paranamer paranamer; public ParanamerParameterNameProvider() { this( null ); } public ParanamerParameterNameProvider(Paranamer paranamer) { this.paranamer = paranamer != null ? paranamer : new CachingParanamer( new AdaptiveParanamer() ); fallBackProvider = new DefaultParameterNameProvider(); } @Override public List getParameterNames(Constructor constructor) { String[] parameterNames; //there are no guarantees regarding thread-safety synchronized ( paranamer ) { parameterNames = paranamer.lookupParameterNames( constructor, false ); } //either null or an empty array is returned if no names could be retrieved if ( parameterNames != null && parameterNames.length == constructor.getParameterCount() ) { return Arrays.asList( parameterNames ); } return fallBackProvider.getParameterNames( constructor ); } @Override public List getParameterNames(Method method) { String[] parameterNames; synchronized ( paranamer ) { parameterNames = paranamer.lookupParameterNames( method, false ); } if ( parameterNames != null && parameterNames.length == method.getParameterCount() ) { return Arrays.asList( parameterNames ); } return fallBackProvider.getParameterNames( method ); } }





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