com.offbynull.coroutines.instrumenter.asm.SimpleVerifier.java Source code

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Here is the source code for com.offbynull.coroutines.instrumenter.asm.SimpleVerifier.java

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/*
 * Copyright (c) 2015, Kasra Faghihi, All rights reserved.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
package com.offbynull.coroutines.instrumenter.asm;

import org.apache.commons.lang3.Validate;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.Type;

/**
 * An extension to ASM's {@link org.objectweb.asm.tree.analysis.SimpleVerifier} that uses {@link ClassInformationRepository} to derive type
 * information rather than a classloader.
 * @author Kasra Faghihi
 */
public final class SimpleVerifier extends org.objectweb.asm.tree.analysis.SimpleVerifier {
    private final ClassInformationRepository repo;

    /**
     * Constructs a {@link SimpleVerifier} object.
     * @param repo repository to use for deriving class details
     * @throws NullPointerException if any argument is {@code null}
     */
    public SimpleVerifier(ClassInformationRepository repo) {
        super(Opcodes.ASM5, null, null, null, false);

        Validate.notNull(repo);

        this.repo = repo;
    }

    @Override
    protected boolean isInterface(final Type t) {
        return repo.getInformation(t.getInternalName()).isInterface();
    }

    @Override
    protected Type getSuperClass(final Type t) {
        String superClass = repo.getInformation(t.getInternalName()).getSuperClassName();
        return superClass == null ? null : Type.getObjectType(superClass);
    }

    @Override
    protected boolean isAssignableFrom(Type t, Type u) {
        return TypeUtils.isAssignableFrom(repo, t, u);
    }

    @Override
    protected Class<?> getClass(final Type t) {
        throw new UnsupportedOperationException("Should never be called");
    }
}