FileWatcherConnectorFactory.java

/**
 * 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.connector.virtual.filewatcher;

import java.io.File;
import java.lang.reflect.Constructor;
import java.util.Collections;
import java.util.Map;

import org.openengsb.connector.virtual.filewatcher.internal.FileWatcherConnector;
import org.openengsb.core.api.Connector;
import org.openengsb.core.api.Constants;
import org.openengsb.core.api.DomainProvider;
import org.openengsb.core.api.security.AuthenticationContext;
import org.openengsb.core.common.VirtualConnectorFactory;
import org.openengsb.core.ekb.api.PersistInterface;
import org.openengsb.core.ekb.api.QueryInterface;
import org.openengsb.labs.delegation.service.DelegationClassLoader;
import org.osgi.framework.BundleContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.google.common.collect.Maps;

public class FileWatcherConnectorFactory extends VirtualConnectorFactory<FileWatcherConnector> {

    private static final Logger LOGGER = LoggerFactory.getLogger(FileWatcherConnectorFactory.class);

    private QueryInterface queryService;

    private PersistInterface persistService;

    private DelegationClassLoader delegationClassLoader;
    private AuthenticationContext authenticationContext;

    public FileWatcherConnectorFactory(DomainProvider domainProvider, PersistInterface persistService,
            QueryInterface queryService, BundleContext bundleContext, AuthenticationContext authenticationContext) {
        super(domainProvider);
        this.persistService = persistService;
        this.queryService = queryService;
        this.delegationClassLoader = new DelegationClassLoader(bundleContext, Constants.DELEGATION_CONTEXT_MODELS,
                getClass().getClassLoader());
        this.authenticationContext = authenticationContext;
    }

    @Override
    protected FileWatcherConnector updateHandlerAttributes(FileWatcherConnector handler,
            Map<String, String> attributes) {
        Class<?> modelType;
        try {
            modelType = delegationClassLoader.loadClass(attributes.get("modelType"));
        } catch (ClassNotFoundException e) {
            throw new IllegalArgumentException(e);
        }
        handler.setModelType(modelType);

        String serializerTypeName = attributes.get("serializer");

        Object parser = instantiateParser(serializerTypeName, modelType);
        handler.setFileSerializer((FileSerializer<?>) parser);
        handler.setWatchfile(new File(attributes.get("watchfile")));
        return handler;
    }

    private Object instantiateParser(String serializerTypeName, Class<?> modelType) {
        try {
            Class<?> parserType = getClass().getClassLoader().loadClass(serializerTypeName);
            Constructor<?> constructor = parserType.getConstructor(Class.class);
            return constructor.newInstance(modelType);
        } catch (Exception e) {
            if (e instanceof RuntimeException) {
                throw (RuntimeException) e;
            } else {
                throw new RuntimeException(e);
            }
        }
    }

    @Override
    protected FileWatcherConnector createNewHandler(String id) {
        return new FileWatcherConnector(
            id, domainProvider.getId(), persistService, queryService, authenticationContext);
    }

    @Override
    public Map<String, String> getValidationErrors(Map<String, String> attributes) {
        Map<String, String> result = Maps.newHashMap();
        return result;
    }

    @Override
    public Map<String, String> getValidationErrors(Connector instance, Map<String, String> attributes) {
        // TODO OPENENGSB-1290: implement some validation
        return Collections.emptyMap();
    }

}