/**
    * Copyright 2010-2013 The Kuali Foundation
    *
    * Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
    *
   * 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.kuali.common.util.xml;
  
  import java.io.ByteArrayOutputStream;
  import java.io.File;
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.io.UnsupportedEncodingException;
  
  import javax.xml.bind.JAXBContext;
  import javax.xml.bind.JAXBException;
  import javax.xml.bind.Marshaller;
  import javax.xml.bind.Unmarshaller;
  
  import org.apache.commons.io.FileUtils;
  import org.apache.commons.io.IOUtils;
  import org.kuali.common.util.LocationUtils;
  
  public class DefaultXmlService implements XmlService {
  
  	@Override
  	public <T> void write(File file, T instance) {
  		OutputStream out = null;
  		try {
  			out = FileUtils.openOutputStream(file);
  			write(out, instance);
  		} catch (IOException e) {
  			throw new IllegalStateException("Unexpected IO error", e);
  		} finally {
  			IOUtils.closeQuietly(out);
  		}
  	}
  
  	@Override
  	public <T> void write(OutputStream out, T instance) {
  		try {
  			JAXBContext context = JAXBContext.newInstance(instance.getClass());
  			Marshaller marshaller = context.createMarshaller();
  			marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
  			marshaller.marshal(instance, out);
  		} catch (JAXBException e) {
  			throw new IllegalStateException("Unexpected JAXB error", e);
  		}
  	}
  
  	@Override
  	@SuppressWarnings("unchecked")
  	public <T> T getObject(InputStream in, Class<T> type) {
  		try {
  			JAXBContext context = JAXBContext.newInstance(type);
  			Unmarshaller unmarshaller = context.createUnmarshaller();
  			return (T) unmarshaller.unmarshal(in);
  		} catch (JAXBException e) {
  			throw new IllegalStateException("Unexpected JAXB error", e);
  		}
  	}
  
  	@Override
  	public <T> T getObject(File file, Class<T> type) {
  		return getObject(LocationUtils.getCanonicalPath(file), type);
  	}
  
  	@Override
  	public <T> T getObject(String location, Class<T> type) {
  		InputStream in = null;
  		try {
  			in = LocationUtils.getInputStream(location);
  			return getObject(in, type);
  		} catch (IOException e) {
  			throw new IllegalStateException("Unexpected JAXB error", e);
  		} finally {
  			IOUtils.closeQuietly(in);
  		}
  	}
  
  	@Override
  	public <T> String toString(T instance, String encoding) {
  		ByteArrayOutputStream out = new ByteArrayOutputStream();
  		write(out, instance);
  		try {
  			return out.toString(encoding);
  		} catch (UnsupportedEncodingException e) {
  			throw new IllegalArgumentException(e);
  		}
 	}
 }