/*
 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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 General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.graalvm.component.installer.ce;

import java.io.IOException;
import java.nio.file.Path;
import java.util.jar.JarFile;
import org.graalvm.component.installer.Feedback;
import org.graalvm.component.installer.jar.JarMetaLoader;
import org.graalvm.component.installer.persist.MetadataLoader;
import org.graalvm.component.installer.ComponentArchiveReader;

Loads JAR files.
Author:
sdedic/**
 * Loads JAR files.
 * 
 * @author sdedic
 */
public final class JarPackageProvider implements ComponentArchiveReader {
    @Override
    public MetadataLoader createLoader(Path p, byte[] magic, String serial, Feedback feedback, boolean verify) throws IOException {
        if ((magic[0] == 0x50) && (magic[1] == 0x4b) &&
                        (magic[2] == 0x03) && (magic[3] == 0x04)) {
            JarFile jf = new JarFile(p.toFile(), verify);
            boolean ok = false;
            try {
                JarMetaLoader ldr = new JarMetaLoader(jf, serial, feedback);
                ok = true;
                return ldr;
            } finally {
                if (!ok) {
                    try {
                        jf.close();
                    } catch (IOException ex) {
                        feedback.error("ERR_ClosingJarFile", ex, ex.getLocalizedMessage());
                    }
                }
            }
        } else {
            return null;
        }
    }
}