gistfile1.txt

/**
 * Licensed to the Austrian Association for Software Tool Integration (AASTI)
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. The AASTI licenses this file to you under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.openengsb.core.persistence.internal;

import java.util.ArrayList;
import java.util.List;
import java.util.Map;

import org.openengsb.core.api.model.ConfigItem;
import org.openengsb.core.api.persistence.ConfigPersistenceBackendService;
import org.openengsb.core.api.persistence.InvalidConfigurationException;
import org.openengsb.core.api.persistence.PersistenceException;
import org.openengsb.core.api.persistence.PersistenceManager;
import org.openengsb.core.api.persistence.PersistenceService;
import org.osgi.framework.BundleContext;

/**
 * Simple {@link ConfigPersistenceBackendService} implementation directly using the core {@link PersistenceService}.
 * Only disadvantage at the current implementation is that objects have to be stored in simple form.
 */
public class CorePersistenceServiceBackend implements ConfigPersistenceBackendService {

    private static final String INTERNAL_TYPE = "internaltypeid";

    private PersistenceManager persistenceManager;
    private PersistenceService persistenceService;
    private BundleContext bundleContext;

    public void init() {
        persistenceService = persistenceManager.getPersistenceForBundle(bundleContext.getBundle());
    }

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public List<ConfigItem<?>> load(Map<String, String> metadata) throws PersistenceException,
        InvalidConfigurationException {
        List<ConfigItem<?>> configItems = new ArrayList<ConfigItem<?>>();
        List<ConfigItem> result = persistenceService.query(new ConfigItem(metadata, null));
        for (ConfigItem<?> configItem : result) {
            String type = configItem.getMetaData().get(INTERNAL_TYPE);
            try {
                ConfigItem newInstance = (ConfigItem) Class.forName(type).newInstance();
                newInstance.setContent(configItem.getContent());
                configItem.getMetaData().remove(INTERNAL_TYPE);
                newInstance.setMetaData(configItem.getMetaData());
                configItems.add(newInstance);
            } catch (Exception e) {
                throw new InvalidConfigurationException("Configuration could not be loaded by persistence manager", e);
            }
        }
        return configItems;
    }

    @Override
    @SuppressWarnings({ "rawtypes", "unchecked" })
    public void persist(ConfigItem<?> config) throws PersistenceException, InvalidConfigurationException {
        config.getMetaData().put(INTERNAL_TYPE, config.getClass().getName().toString());
        persistenceService.create(new ConfigItem(config.getMetaData(), config.getContent()));
    }

    @Override
    public boolean supports(Class<? extends ConfigItem<?>> configItemType) {
        // as an object persistence this backend supports everything
        return true;
    }

    public void setPersistenceManager(PersistenceManager persistenceManager) {
        this.persistenceManager = persistenceManager;
    }

    public void setBundleContext(BundleContext bundleContext) {
        this.bundleContext = bundleContext;
    }

}