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