Loads saved java object from XML file. - Android XML

Android examples for XML:JAXB

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Description

Loads saved java object from XML file.

Demo Code

/**/*from w  w w.ja va  2s .c om*/
 *  Copyright 2009 Welocalize, Inc. 
 *  
 *  Licensed 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.
 *  
 */
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import org.apache.log4j.Logger;

public class Main{
    public static void main(String[] argv) throws Exception{
        Class clazz = String.class;
        String file = "java2s.com";
        System.out.println(load(clazz,file));
    }
    private static Logger log = Logger.getLogger(XmlUtil.class);
    /**
     * Loads saved java object from <code>file</code>.
     * 
     * @param <T>
     *            The class of object. Can't be null.
     * @param clazz
     *            The class of object. Can't be null.
     * @param file
     *            The xml file to load. Can't be null and must exist.
     * @return The loaded object.
     */
    @SuppressWarnings("unchecked")
    public static <T> T load(Class<T> clazz, String file) {
        log.debug("Loading from " + file);

        Assert.assertNotNull(clazz, "Class name");
        Assert.assertNotNull(file, "File path");
        Assert.assertFileExist(file);

        FileReader fr = null;
        T ob = null;
        try {
            JAXBContext context = JAXBContext.newInstance(clazz);
            Unmarshaller um = context.createUnmarshaller();
            fr = new FileReader(file);
            ob = (T) um.unmarshal(fr);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        } finally {
            if (fr != null) {
                try {
                    fr.close();
                } catch (IOException e) {
                    log.error(e.getMessage(), e);
                }
            }
        }

        log.debug("Loading xml finished");
        return ob;
    }
}

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