NIHVIVO-160 Add getFileItem()

webapp/src/edu/cornell/mannlib/vitro/webapp/filestorage/uploadrequest/FileUploadServletRequest.java

@@ -19,7 +19,6 @@ import javax.servlet.http.HttpSession;
 
 import org.apache.commons.fileupload.FileItem;
 import org.apache.commons.fileupload.FileUploadException;
-import org.apache.commons.fileupload.FileUploadBase.SizeLimitExceededException;
 import org.apache.commons.fileupload.servlet.ServletFileUpload;
 
 /**
@@ -71,10 +70,22 @@ public abstract class FileUploadServletRequest implements HttpServletRequest {
 	// New functionality to be implemented by the subclasses.
 	// ----------------------------------------------------------------------
 
+	/** Was this a multipart HTTP request? */
 	public abstract boolean isMultipart();
 
+	/**
+	 * Get the map of file items, by name.
+	 */
 	public abstract Map<String, List<FileItem>> getFiles();
 
+	/**
+	 * Find a non-empty file item with this name.
+	 * 
+	 * @return the first such file item, or <code>null</code> if no matching,
+	 *         non-empty items were found.
+	 */
+	public abstract FileItem getFileItem(String string);
+
 	// ----------------------------------------------------------------------
 	// Delegated methods.
 	// ----------------------------------------------------------------------

webapp/src/edu/cornell/mannlib/vitro/webapp/filestorage/uploadrequest/MultipartHttpServletRequest.java

@@ -133,6 +133,29 @@ class MultipartHttpServletRequest extends FileUploadServletRequest {
 		return files;
 	}
 
+	/**
+	 * {@inheritDoc}
+	 * <p>
+	 * There may be more than one file item with the given name. If the first
+	 * one is empty (size is zero), keep looking for a non-empty one.
+	 * </p>
+	 */
+	@Override
+	public FileItem getFileItem(String name) {
+		List<FileItem> items = files.get(name);
+		if (items == null) {
+			return null;
+		}
+
+		for (FileItem item : items) {
+			if (item.getSize() > 0L) {
+				return item;
+			}
+		}
+
+		return null;
+	}
+
 	// ----------------------------------------------------------------------
 	// Parameter-related methods won't find anything on the delegate request,
 	// since parsing consumed the parameters. So we need to look to the parsed

webapp/src/edu/cornell/mannlib/vitro/webapp/filestorage/uploadrequest/SimpleHttpServletRequestWrapper.java

@@ -36,6 +36,11 @@ class SimpleHttpServletRequestWrapper extends FileUploadServletRequest {
 		return Collections.emptyMap();
 	}
 	
+	@Override
+	public FileItem getFileItem(String string) {
+		return null;
+	}
+
 	// ----------------------------------------------------------------------
 	// Since this is not a multipart request, the parameter methods can be
 	// delegated.