1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one
3 * or more contributor license agreements. See the NOTICE file
4 * distributed with this work for additional information
5 * regarding copyright ownership. The ASF licenses this file
6 * to you under the Apache License, Version 2.0 (the
7 * "License"); you may not use this file except in compliance
8 * with the License. You may obtain a copy of the License at
9 *
10 * https://www.apache.org/licenses/LICENSE-2.0
11 *
12 * Unless required by applicable law or agreed to in writing,
13 * software distributed under the License is distributed on an
14 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15 * KIND, either express or implied. See the License for the
16 * specific language governing permissions and limitations
17 * under the License.
18 */
19 package org.apache.bcel.verifier.structurals;
20
21 import org.apache.bcel.generic.InstructionHandle;
22 import org.apache.bcel.generic.ObjectType;
23
24 /**
25 * This class represents an exception handler; that is, an ObjectType representing a subclass of {@link Throwable} and
26 * the instruction the handler starts off (represented by an InstructionContext).
27 */
28 public class ExceptionHandler {
29
30 static final ExceptionHandler[] EMPTY_ARRAY = {};
31
32 /** The type of the exception to catch. NULL means ANY. */
33 private final ObjectType catchType;
34
35 /** The InstructionHandle where the handling begins. */
36 private final InstructionHandle handlerPc;
37
38 /** Leave instance creation to JustIce. */
39 ExceptionHandler(final ObjectType catchType, final InstructionHandle handlerPc) {
40 this.catchType = catchType;
41 this.handlerPc = handlerPc;
42 }
43
44 /**
45 * Returns the type of the exception that's handled. <B>'null' means 'ANY'.</B>
46 */
47 public ObjectType getExceptionType() {
48 return catchType;
49 }
50
51 /**
52 * Returns the InstructionHandle where the handler starts off.
53 */
54 public InstructionHandle getHandlerStart() {
55 return handlerPc;
56 }
57 }