org.springframework.expression.ConstructorResolver Maven / Gradle / Ivy

Show more of this group Show more artifacts with this name
Show all versions of spring-expression Show documentation

Spring Expression Language (SpEL)

There is a newer version: 6.1.13

/*
 * Copyright 2002-2016 the original author or 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
 *
 *      https://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 org.springframework.expression;

import java.util.List;

import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;

/**
 * A constructor resolver attempts to locate a constructor and returns a ConstructorExecutor
 * that can be used to invoke that constructor. The ConstructorExecutor will be cached but
 * if it 'goes stale' the resolvers will be called again.
 *
 * @author Andy Clement
 * @since 3.0
 */
@FunctionalInterface
public interface ConstructorResolver {

	/**
	 * Within the supplied context determine a suitable constructor on the supplied type
	 * that can handle the specified arguments. Return a ConstructorExecutor that can be
	 * used to invoke that constructor (or {@code null} if no constructor could be found).
	 * @param context the current evaluation context
	 * @param typeName the type upon which to look for the constructor
	 * @param argumentTypes the arguments that the constructor must be able to handle
	 * @return a ConstructorExecutor that can invoke the constructor, or null if non found
	 */
	@Nullable
	ConstructorExecutor resolve(EvaluationContext context, String typeName, List argumentTypes)
			throws AccessException;

}