1 /* 2 * Copyright (c) 2015, 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 26 package jdk.nashorn.api.tree; 27 28 29 /** 30 * Indicates that an unknown kind of Tree was encountered. This 31 * can occur if the language evolves and new kinds of Trees are 32 * added to the {@code Tree} hierarchy. May be thrown by a 33 * {@linkplain TreeVisitor tree visitor} to indicate that the 34 * visitor was created for a prior version of the language. 35 * 36 * @since 1.9 37 */ 38 @jdk.Exported 39 public class UnknownTreeException extends RuntimeException { 40 41 private static final long serialVersionUID = 1L; 42 43 private transient final Tree tree; 44 private transient final Object parameter; 45 46 /** 47 * Creates a new {@code UnknownTreeException}. The {@code p} 48 * parameter may be used to pass in an additional argument with 49 * information about the context in which the unknown element was 50 * encountered; for example, the visit methods of {@link 51 * TreeVisitor} may pass in their additional parameter. 52 * 53 * @param t the unknown tree, may be {@code null} 54 * @param p an additional parameter, may be {@code null} 55 */ 56 public UnknownTreeException(Tree t, Object p) { 57 super("Unknown tree: " + t); 58 this.tree = t; 59 this.parameter = p; 60 } 61 62 /** 63 * Returns the unknown tree. 64 * The value may be unavailable if this exception has been 65 * serialized and then read back in. 66 * 67 * @return the unknown element, or {@code null} if unavailable 68 */ 69 public Tree getUnknownTree() { 70 return tree; 71 } 72 73 /** 74 * Returns the additional argument. 75 * The value may be unavailable if this exception has been 76 * serialized and then read back in. 77 * 78 * @return the additional argument 79 */ 80 public Object getArgument() { 81 return parameter; 82 } 83 }