001/*
002 * Licensed to the Apache Software Foundation (ASF) under one
003 * or more contributor license agreements.  See the NOTICE file
004 * distributed with this work for additional information
005 * regarding copyright ownership.  The ASF licenses this file
006 * to you under the Apache License, Version 2.0 (the
007 * "License"); you may not use this file except in compliance
008 * with the License.  You may obtain a copy of the License at
009 *
010 *   https://www.apache.org/licenses/LICENSE-2.0
011 *
012 * Unless required by applicable law or agreed to in writing,
013 * software distributed under the License is distributed on an
014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
015 * KIND, either express or implied.  See the License for the
016 * specific language governing permissions and limitations
017 * under the License.
018 */
019package org.apache.bcel.verifier.structurals;
020
021import org.apache.bcel.generic.InstructionHandle;
022import org.apache.bcel.generic.ObjectType;
023
024/**
025 * This class represents an exception handler; that is, an ObjectType representing a subclass of {@link Throwable} and
026 * the instruction the handler starts off (represented by an InstructionContext).
027 */
028public class ExceptionHandler {
029
030    static final ExceptionHandler[] EMPTY_ARRAY = {};
031
032    /** The type of the exception to catch. NULL means ANY. */
033    private final ObjectType catchType;
034
035    /** The InstructionHandle where the handling begins. */
036    private final InstructionHandle handlerPc;
037
038    /** Leave instance creation to JustIce. */
039    ExceptionHandler(final ObjectType catchType, final InstructionHandle handlerPc) {
040        this.catchType = catchType;
041        this.handlerPc = handlerPc;
042    }
043
044    /**
045     * Returns the type of the exception that's handled. <B>'null' means 'ANY'.</B>
046     */
047    public ObjectType getExceptionType() {
048        return catchType;
049    }
050
051    /**
052     * Returns the InstructionHandle where the handler starts off.
053     */
054    public InstructionHandle getHandlerStart() {
055        return handlerPc;
056    }
057}