/*
 * 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
 *
 *   https://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;

import org.apache.bcel.classfile.JavaClass;
import org.apache.bcel.classfile.Utility;

/**
 * The NativeVerifier class implements a main(String[] args) method that's roughly compatible to the one in the Verifier
 * class, but that uses the JVM's internal verifier for its class file verification. This can be used for comparison
 * runs between the JVM-internal verifier and JustIce.
 */
public abstract class NativeVerifier {

    /**
     * Works only on the first argument.
     */
    public static void main(final String[] args) {
        if (args.length != 1) {
            System.out.println("Verifier front-end: need exactly one argument.");
            System.exit(1);
        }
        final int dotclasspos = args[0].lastIndexOf(JavaClass.EXTENSION);
        if (dotclasspos != -1) {
            args[0] = args[0].substring(0, dotclasspos);
        }
        args[0] = Utility.pathToPackage(args[0]);
        // System.out.println(args[0]);
        try {
            Class.forName(args[0]);
        } catch (final ExceptionInInitializerError eiie) { // subclass of LinkageError!
            System.out.println("NativeVerifier: ExceptionInInitializerError encountered on '" + args[0] + "'.");
            System.out.println(eiie);
            System.exit(1);
        } catch (final LinkageError le) {
            System.out.println("NativeVerifier: LinkageError encountered on '" + args[0] + "'.");
            System.out.println(le);
            System.exit(1);
        } catch (final ClassNotFoundException cnfe) {
            System.out.println("NativeVerifier: FILE NOT FOUND: '" + args[0] + "'.");
            System.exit(1);
        } catch (final Throwable t) { // OK to catch Throwable here as we call exit.
            System.out.println("NativeVerifier: Unspecified verification error on '" + args[0] + "'.");
            System.exit(1);
        }
        System.out.println("NativeVerifier: Class file '" + args[0] + "' seems to be okay.");
        System.exit(0);
    }

    /**
     * This class must not be instantiated.
     */
    private NativeVerifier() {
    }
}
