org.lenskit.util.io.CustomClassLoaderObjectInputStream.java Source code

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Here is the source code for org.lenskit.util.io.CustomClassLoaderObjectInputStream.java

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/*
 * LensKit, an open-source toolkit for recommender systems.
 * Copyright 2014-2017 LensKit contributors (see CONTRIBUTORS.md)
 * Copyright 2010-2014 Regents of the University of Minnesota
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
package org.lenskit.util.io;

import org.apache.commons.lang3.ClassUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectStreamClass;

/**
 * Object input stream that uses a custom class loader.
 *
 * @author <a href="http://www.grouplens.org">GroupLens Research</a>
 */
public class CustomClassLoaderObjectInputStream extends ObjectInputStream {
    private static final Logger logger = LoggerFactory.getLogger(CustomClassLoaderObjectInputStream.class);
    private final ClassLoader classLoader;

    public CustomClassLoaderObjectInputStream(InputStream in, ClassLoader loader) throws IOException {
        super(in);
        classLoader = loader;
    }

    @Override
    protected Class<?> resolveClass(ObjectStreamClass desc) throws IOException, ClassNotFoundException {
        if (classLoader == null) {
            return super.resolveClass(desc);
        } else {
            String name = desc.getName();
            logger.debug("resolving class {}", name);
            return ClassUtils.getClass(classLoader, name);
        }
    }
}