001/*
002 * Copyright 2002-2013 the original author or authors.
003 *
004 * Licensed under the Apache License, Version 2.0 (the "License");
005 * you may not use this file except in compliance with the License.
006 * You may obtain a copy of the License at
007 *
008 *      https://www.apache.org/licenses/LICENSE-2.0
009 *
010 * Unless required by applicable law or agreed to in writing, software
011 * distributed under the License is distributed on an "AS IS" BASIS,
012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013 * See the License for the specific language governing permissions and
014 * limitations under the License.
015 */
016
017package org.springframework.expression;
018
019
020// TODO Is the resolver/executor model too pervasive in this package?
021/**
022 * Executors are built by resolvers and can be cached by the infrastructure to repeat an
023 * operation quickly without going back to the resolvers. For example, the particular
024 * constructor to run on a class may be discovered by the reflection constructor resolver
025 * - it will then build a ConstructorExecutor that executes that constructor and the
026 * ConstructorExecutor can be reused without needing to go back to the resolver to
027 * discover the constructor again.
028 *
029 * <p>They can become stale, and in that case should throw an AccessException - this will
030 * cause the infrastructure to go back to the resolvers to ask for a new one.
031 *
032 * @author Andy Clement
033 * @since 3.0
034 */
035public interface ConstructorExecutor {
036
037        /**
038         * Execute a constructor in the specified context using the specified arguments.
039         * @param context the evaluation context in which the command is being executed
040         * @param arguments the arguments to the constructor call, should match (in terms
041         * of number and type) whatever the command will need to run
042         * @return the new object
043         * @throws AccessException if there is a problem executing the command or the
044         * CommandExecutor is no longer valid
045         */
046        TypedValue execute(EvaluationContext context, Object... arguments) throws AccessException;
047
048}