/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.apache.bcel.verifier.structurals;

import org.apache.bcel.generic.InstructionHandle;
import org.apache.bcel.generic.ObjectType;

/**
 * This class represents an exception handler; that is, an ObjectType representing a subclass of java.lang.Throwable and
 * the instruction the handler starts off (represented by an InstructionContext).
 */
public class ExceptionHandler {

    static final ExceptionHandler[] EMPTY_ARRAY = {};

    /** The type of the exception to catch. NULL means ANY. */
    private final ObjectType catchType;

    /** The InstructionHandle where the handling begins. */
    private final InstructionHandle handlerPc;

    /** Leave instance creation to JustIce. */
    ExceptionHandler(final ObjectType catchType, final InstructionHandle handlerPc) {
        this.catchType = catchType;
        this.handlerPc = handlerPc;
    }

    /**
     * Returns the type of the exception that's handled. <B>'null' means 'ANY'.</B>
     */
    public ObjectType getExceptionType() {
        return catchType;
    }

    /**
     * Returns the InstructionHandle where the handler starts off.
     */
    public InstructionHandle getHandlerStart() {
        return handlerPc;
    }
}
