/*

 * Copyright (c) 2011, 2017, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

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package com.sun.source.tree;

import java.util.List;

/**

 * A tree node for a lambda expression.

 *

 * For example:

 * <pre>{@code

 *   ()->{}

 *   (List<String> ls)->ls.size()

 *   (x,y)-> { return x + y; }

 * }</pre>

 */

public interface LambdaExpressionTree extends ExpressionTree {

    /**

     * Lambda expressions come in two forms:

     * <ul>

     * <li> expression lambdas, whose body is an expression, and

     * <li> statement lambdas, whose body is a block

     * </ul>

     */

    public enum BodyKind {

        /** enum constant for expression lambdas */

        EXPRESSION,

        /** enum constant for statement lambdas */

        STATEMENT

    }

    /**

     * Returns the parameters of this lambda expression.

     * @return the parameters

     */

    List<? extends VariableTree> getParameters();

    /**

     * Returns the body of the lambda expression.

     * @return the body

     */

    Tree getBody();

    /**

     * Returns the kind of the body of the lambda expression.

     * @return the kind of the body

     */

    BodyKind getBodyKind();

}