LambdaExpressionTree.java revision 3193:3b3bea483542
1/* 2 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26package com.sun.source.tree; 27 28import java.util.List; 29 30/** 31 * A tree node for a lambda expression. 32 * 33 * For example: 34 * <pre>{@code 35 * ()->{} 36 * (List<String> ls)->ls.size() 37 * (x,y)-> { return x + y; } 38 * }</pre> 39 */ 40public interface LambdaExpressionTree extends ExpressionTree { 41 42 /** 43 * Lambda expressions come in two forms: 44 * <ul compact> 45 * <li> expression lambdas, whose body is an expression, and 46 * <li> statement lambdas, whose body is a block 47 * </ul> 48 */ 49 public enum BodyKind { 50 /** enum constant for expression lambdas */ 51 EXPRESSION, 52 /** enum constant for statement lambdas */ 53 STATEMENT 54 } 55 56 /** 57 * Returns the parameters of this lambda expression. 58 * @return the parameters 59 */ 60 List<? extends VariableTree> getParameters(); 61 62 /** 63 * Returns the body of the lambda expression. 64 * @return the body 65 */ 66 Tree getBody(); 67 68 /** 69 * Returns the kind of the body of the lambda expression. 70 * @return the kind of the body 71 */ 72 BodyKind getBodyKind(); 73} 74