package org.kuali.common.devops.archive.s3;
   
   import static com.google.common.collect.Maps.newHashMap;
   import static java.lang.Long.parseLong;
   
   import java.util.Map;
   import java.util.Set;
   
   import org.kuali.common.devops.archive.ArchivedFileMetadata;
  
  import com.google.common.base.Converter;
  import com.google.common.collect.ImmutableMap;
  import com.google.common.collect.ImmutableSet;
  
  public final class MetadataConverter extends Converter<ArchivedFileMetadata, Map<String, String>> {
  
  	public static final MetadataConverter INSTANCE = new MetadataConverter();
  
  	// S3 metadata keys are case insensitive and always come back lower case
  	public static final String SIZE_KEY = "archive.source.size";
  	public static final String LAST_MODIFIED_KEY = "archive.source.lastmodified";
  	public static final String MD5_KEY = "archive.source.md5";
  	public static final Set<String> KEYS = ImmutableSet.of(SIZE_KEY, LAST_MODIFIED_KEY, MD5_KEY);
  
  	@Override
  	protected Map<String, String> doForward(ArchivedFileMetadata a) {
  		Map<String, String> map = newHashMap();
  		map.put(SIZE_KEY, a.getSize() + "");
  		map.put(LAST_MODIFIED_KEY, a.getLastModified() + "");
  		map.put(MD5_KEY, a.getMd5());
  		return ImmutableMap.copyOf(map);
  	}
  
  	@Override
  	protected ArchivedFileMetadata doBackward(Map<String, String> b) {
  		long size = parseLong(b.get(SIZE_KEY));
  		long lastModified = parseLong(b.get(LAST_MODIFIED_KEY));
  		String md5 = b.get(MD5_KEY);
  		return ArchivedFileMetadata.builder().withSize(size).withLastModified(lastModified).withMd5(md5).build();
  	}
  
  	private MetadataConverter() {
  	}
  
  }