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Fabric3 Contribution Scanner Implementation.
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/*
* Fabric3
* Copyright (c) 2009-2013 Metaform Systems
*
* Fabric3 is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 3 of
* the License, or (at your option) any later version, with the
* following exception:
*
* Linking this software statically or dynamically with other
* modules is making a combined work based on this software.
* Thus, the terms and conditions of the GNU General Public
* License cover the whole combination.
*
* As a special exception, the copyright holders of this software
* give you permission to link this software with independent
* modules to produce an executable, regardless of the license
* terms of these independent modules, and to copy and distribute
* the resulting executable under terms of your choice, provided
* that you also meet, for each linked independent module, the
* terms and conditions of the license of that module. An
* independent module is a module which is not derived from or
* based on this software. If you modify this software, you may
* extend this exception to your version of the software, but
* you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version.
*
* Fabric3 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 for more details.
*
* You should have received a copy of the
* GNU General Public License along with Fabric3.
* If not, see .
*/
package org.fabric3.contribution.scanner.impl;

import java.io.File;

import org.oasisopen.sca.annotation.EagerInit;
import org.oasisopen.sca.annotation.Reference;

import org.fabric3.contribution.scanner.spi.FileResource;
import org.fabric3.contribution.scanner.spi.FileSystemResource;
import org.fabric3.contribution.scanner.spi.FileSystemResourceFactory;
import org.fabric3.contribution.scanner.spi.FileSystemResourceFactoryRegistry;

/**
 * Creates a FileResource for exploded SCA contribution jars
 */
@EagerInit
public class ExplodedJarResourceFactory implements FileSystemResourceFactory {

    public ExplodedJarResourceFactory(@Reference FileSystemResourceFactoryRegistry registry) {
        registry.register(this);
    }

    public FileSystemResource createResource(File file) {
        if (!file.isDirectory()) {
            return null;
        }
        File manifest = new File(file, "/META-INF/sca-contribution.xml");
        if (!manifest.exists()) {
            // not a contribution archive, ignore
            return null;
        }
        DirectoryResource directoryResource = new DirectoryResource(file);
        // monitor everything in META-INF
        File metaInf = new File(file, "/META-INF");
        monitorResource(directoryResource, metaInf);
        return directoryResource;
    }

    private void monitorResource(DirectoryResource directoryResource, File file) {
        if (file.isDirectory()) {
            for (File entry : file.listFiles()) {
                if (entry.isFile()) {
                    directoryResource.addResource(new FileResource(entry));
                } else {
                    monitorResource(directoryResource, entry);
                }
            }
        } else {
            directoryResource.addResource(new FileResource(file));
        }

    }
}