    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 *
    017 */
    018package org.apache.bcel.verifier;
    019
    020/**
    021 * The NativeVerifier class implements a main(String[] args) method that's
    022 * roughly compatible to the one in the Verifier class, but that uses the
    023 * JVM's internal verifier for its class file verification.
    024 * This can be used for comparison runs between the JVM-internal verifier
    025 * and JustIce.
    026 *
    027 * @version $Id$
    028 */
    029public abstract class NativeVerifier {
    030
    031    /**
    032     * This class must not be instantiated.
    033     */
    034    private NativeVerifier() {
    035    }
    036
    037
    038    /**
    039     * Works only on the first argument.
    040     */
    041    public static void main( final String[] args ) {
    042        if (args.length != 1) {
    043            System.out.println("Verifier front-end: need exactly one argument.");
    044            System.exit(1);
    045        }
    046        final int dotclasspos = args[0].lastIndexOf(".class");
    047        if (dotclasspos != -1) {
    048            args[0] = args[0].substring(0, dotclasspos);
    049        }
    050        args[0] = args[0].replace('/', '.');
    051        //System.out.println(args[0]);
    052        try {
    053            Class.forName(args[0]);
    054        } catch (final ExceptionInInitializerError eiie) { //subclass of LinkageError!
    055            System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '"
    056                    + args[0] + "'.");
    057            System.out.println(eiie);
    058            System.exit(1);
    059        } catch (final LinkageError le) {
    060            System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
    061            System.out.println(le);
    062            System.exit(1);
    063        } catch (final ClassNotFoundException cnfe) {
    064            System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
    065            System.exit(1);
    066        } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
    067            System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
    068            System.exit(1);
    069        }
    070        System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
    071        System.exit(0);
    072    }
    073}