DefaultPluginDescriptorResolver.java

/**
 * ***************************************************************************
 * Copyright (c) 2010 Qcadoo Limited
 * Project: Qcadoo Framework
 * Version: 1.4
 *
 * This file is part of Qcadoo.
 *
 * Qcadoo is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published
 * by the Free Software Foundation; either version 3 of the License,
 * or (at your option) any later version.
 *
 * This program 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 * ***************************************************************************
 */
package com.qcadoo.plugin.internal.descriptorresolver;

import java.io.IOException;
import java.util.Arrays;
import java.util.HashSet;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.PathMatchingResourcePatternResolver;
import org.springframework.core.io.support.ResourcePatternResolver;
import org.springframework.stereotype.Service;

import com.qcadoo.plugin.internal.api.PluginDescriptorResolver;

@Service
public class DefaultPluginDescriptorResolver implements PluginDescriptorResolver {

    private final ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

    @Value("#{plugin.descriptors}")
    private String descriptor;

    @Override
    public Resource[] getDescriptors() {
        try {
            Resource[] descriptors = resolver.getResources(ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + descriptor);
            HashSet<Resource> uniqueDescriptors = new HashSet<Resource>(Arrays.asList(descriptors));
            return uniqueDescriptors.toArray(new Resource[uniqueDescriptors.size()]);
        } catch (IOException e) {
            throw new IllegalStateException("Failed to find classpath resources for "
                    + ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX + descriptor, e);
        }
    }

}