edu.ccut.titan.component.loader.DirectoryInfoLoader.java Source code

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Here is the source code for edu.ccut.titan.component.loader.DirectoryInfoLoader.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF 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 edu.ccut.titan.component.loader;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import org.apache.log4j.Logger;
import org.dom4j.Document;
import org.dom4j.Element;
import org.osgi.framework.Bundle;

import edu.ccut.titan.component.IDirectoryInfo;
import edu.ccut.titan.component.TitanComponentException;
import edu.ccut.titan.component.impl.directory.TitanDirectoryFactory;
import edu.ccut.titan.component.xml.Dom4jUtils;

/**
 * load .titan file for directory information
 * 
 * @author LeslieGu
 * 
 */
public abstract class DirectoryInfoLoader {

    private static final Logger logger = Logger.getLogger(DirectoryInfoLoader.class.getPackage().getName());

    private static final String KEY_VERSION = "version";

    private static final String KEY_DESCRIPTION = "description";

    private static final String KEY_TYPE = "type";

    private static final String KEY_TIME = "time";

    public static IDirectoryInfo loadDirectoryInfo(Bundle bundle, String filePath) throws TitanComponentException {

        InputStream in = null;
        try {
            URL url = bundle.getEntry(filePath);

            if (url == null) {
                logger.error("can't find file in " + bundle.getSymbolicName() + "with name " + filePath);

                throw new TitanComponentException(
                        "can't find file in " + bundle.getSymbolicName() + "with name " + filePath);
            }

            in = url.openStream();

            IDirectoryInfo directoryInfo = loadDirectoryInfo(in);

            String directoryPath = filePath.substring(0, filePath.lastIndexOf("/"));

            logger.debug("load root directory path = \"" + directoryPath + "\"");
            logger.debug("");

            directoryInfo.setDirectoryPath(directoryPath);

            return directoryInfo;
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                if (in != null) {
                    in.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }

        return null;
    }

    private static IDirectoryInfo loadDirectoryInfo(InputStream in) throws TitanComponentException {

        Document document = Dom4jUtils.getDocment(in);

        Element root = document.getRootElement();

        String version = root.elementText(KEY_VERSION);
        String description = root.elementText(KEY_DESCRIPTION);
        String type = root.elementText(KEY_TYPE);
        String time = root.elementText(KEY_TIME);

        logger.debug("load root directory version = \"" + version + "\"");
        logger.debug("load root directory description = \"" + description + "\"");
        logger.debug("load root directory type = \"" + type + "\"");
        logger.debug("load root directory time = \"" + time + "\"");

        IDirectoryInfo directoryInfo = TitanDirectoryFactory.getInstance().createDirectory(version, description,
                type, time);

        return directoryInfo;
    }
}