org.cadixdev.bombe.asm.jar.ClassLoaderClassProvider Maven / Gradle / Ivy

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/*
 * Copyright (c) 2018, Jamie Mansfield 
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *  Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 *  Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 *  Neither the name of the copyright holder nor the names of its
 *   contributors may be used to endorse or promote products derived from
 *   this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package org.cadixdev.bombe.asm.jar;

import org.cadixdev.bombe.util.ByteStreams;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;

/**
 * An implementation of {@link ClassProvider} backed by a {@link ClassLoader}.
 *
 * @author Jamie Mansfield
 * @since 0.3.0
 */
public class ClassLoaderClassProvider implements ClassProvider {

    private final ClassLoader loader;

    public ClassLoaderClassProvider(final ClassLoader loader) {
        this.loader = loader;
    }

    @Override
    public byte[] get(final String klass) {
        final String internalName = klass + ".class";

        try (final InputStream in = this.loader.getResourceAsStream(internalName)) {
            if (in == null) return null;

            final ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ByteStreams.copy(in, baos);
            return baos.toByteArray();
        }
        catch (final IOException ignored) {
            return null;
        }
    }

}