1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.bcel.verifier.structurals;
18
19 import org.apache.bcel.generic.InstructionHandle;
20 import org.apache.bcel.generic.ObjectType;
21
22 /**
23 * This class represents an exception handler; that is, an ObjectType representing a subclass of {@link Throwable} and
24 * the instruction the handler starts off (represented by an InstructionContext).
25 */
26 public class ExceptionHandler {
27
28 static final ExceptionHandler[] EMPTY_ARRAY = {};
29
30 /** The type of the exception to catch. NULL means ANY. */
31 private final ObjectType catchType;
32
33 /** The InstructionHandle where the handling begins. */
34 private final InstructionHandle handlerPc;
35
36 /** Leave instance creation to JustIce. */
37 ExceptionHandler(final ObjectType catchType, final InstructionHandle handlerPc) {
38 this.catchType = catchType;
39 this.handlerPc = handlerPc;
40 }
41
42 /**
43 * Returns the type of the exception that's handled. <B>'null' means 'ANY'.</B>
44 */
45 public ObjectType getExceptionType() {
46 return catchType;
47 }
48
49 /**
50 * Returns the InstructionHandle where the handler starts off.
51 */
52 public InstructionHandle getHandlerStart() {
53 return handlerPc;
54 }
55 }