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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  }