com.codercowboy.photo.organizer.service.LibraryMarshaller.java Source code

Introduction

Here is the source code for com.codercowboy.photo.organizer.service.LibraryMarshaller.java

Source

package com.codercowboy.photo.organizer.service;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBElement;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;

import org.apache.commons.io.FileUtils;

import com.codercowboy.photo.organizer.service.v1.Library;

/*
 * Copyright 2015 Jason Baker
 * 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.
 */

public class LibraryMarshaller {
    transient private JAXBContext ctx = null;

    private JAXBContext createContext() throws JAXBException {
        if (ctx == null) {
            ctx = JAXBContext.newInstance(Library.class.getPackage().getName());
        }
        return ctx;
    }

    public void saveLibrary(Library library, String fileName) throws Exception {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        try {
            Marshaller marshaller = this.createContext().createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
            marshaller.marshal(library, outputStream);
            FileUtils.writeByteArrayToFile(new File(fileName), outputStream.toByteArray());
        } finally {
            outputStream.close();
        }
    }

    public Library loadLibrary(String fileName) throws Exception {
        byte[] fileData = FileUtils.readFileToByteArray(new File(fileName));
        ByteArrayInputStream bais = new ByteArrayInputStream(fileData);
        try {
            Unmarshaller unmarshaller = this.createContext().createUnmarshaller();
            @SuppressWarnings("unchecked")
            JAXBElement<Library> jaxbElement = (JAXBElement<Library>) unmarshaller.unmarshal(bais);
            return jaxbElement.getValue();

        } finally {
            bais.close();
        }
    }
}