hdf.view

Interface TreeView

All Known Implementing Classes:

DefaultTreeView

public interface TreeView

TreeView defines APIs for opening a file and displaying the file structure in a tree structure.

TreeView uses folders and leaf nodes to represent groups and data objects in the file. You can expand or collapse folders to navigate data objects in the file.

From the TreeView, you can open the data content or metadata of the selected object. You can select object(s) to delete or add new objects to the file.

Version:

2.4 9/6/2007

Author:

Peter X. Cao

Method Summary

Modifier and Type	Method and Description
void	addObject(HObject newObject, Group parentGroup) Adds a new data object to the file.
void	closeFile(FileFormat file) close a file
TreeNode	findTreeNode(HObject obj)
List<FileFormat>	getCurrentFiles()
HObject	getCurrentObject()
FileFormat	getSelectedFile() Gets the selected the file.
List<?>	getSelectedObjects() Gets a list of selected objects in the tree.
JTree	getTree() Returns the JTree which holds the file structure.
FileFormat	openFile(String filename, int accessID) Opens a file and retrieves the file structure of the file.
FileFormat	reopenFile(FileFormat theFile)
void	saveFile(FileFormat file) save a file
DataView	showDataContent(HObject dataObject) Display the content of a data object.
MetaDataView	showMetaData(HObject dataObject) Displays the meta data of a data object.

Method Detail

openFile

FileFormat openFile(String filename,
                    int accessID)
             throws Exception

Opens a file and retrieves the file structure of the file. It also can be used to create a new file by setting the accessID to FileFormat.CREATE.

Subclasses must implement this function to take appropriate steps to open a file.

Parameters:

filename - the name of the file to open.

accessID - identifier for the file access. Valid value of accessID is:

• FileFormat.READ --- allow read-only access to file.
• FileFormat.WRITE --- allow read and write access to file.
• FileFormat.CREATE --- create a new file.

Returns:

the FileFormat of this file if successful; otherwise returns null.

Throws:

Exception - if a failure occurred

reopenFile

FileFormat reopenFile(FileFormat theFile)
               throws Exception

Throws:

Exception

closeFile

void closeFile(FileFormat file)
        throws Exception

close a file

Parameters:

file - the file to close

Throws:

Exception - if a failure occurred

saveFile

void saveFile(FileFormat file)
       throws Exception

save a file

Parameters:

file - the file to save

Throws:

Exception - if a failure occurred

getSelectedFile

FileFormat getSelectedFile()

Gets the selected the file. When multiple files are open, we need to know which file is currently selected.

Returns:

the FileFormat of the selected file.

getSelectedObjects

List<?> getSelectedObjects()

Gets a list of selected objects in the tree. Obtaining a list of current selected objects is necessary for copy/paste/delete objects.

Returns:

a list of selected object in the tree.

getCurrentObject

HObject getCurrentObject()

Returns:

the current selected object in the tree.

showDataContent

DataView showDataContent(HObject dataObject)
                  throws Exception

Display the content of a data object.

Parameters:

dataObject - the data object

Returns:

the dataview that displays the data content

Throws:

Exception - if a failure occurred

showMetaData

MetaDataView showMetaData(HObject dataObject)
                   throws Exception

Displays the meta data of a data object.

Parameters:

dataObject - the data object

Returns:

the MetaDataView that displays the MetaData of the data object

Throws:

Exception - if a failure occurred

addObject

void addObject(HObject newObject,
               Group parentGroup)
        throws Exception

Adds a new data object to the file.

Parameters:

newObject - the new object to add.

parentGroup - the parent group the object is to add to.

Throws:

Exception - if an exception occurs while adding a new data object to the file

getTree

JTree getTree()

Returns the JTree which holds the file structure.

Returns:

the JTree which holds the file structure.

getCurrentFiles

List<FileFormat> getCurrentFiles()

Returns:

the list of currently open files.

findTreeNode

TreeNode findTreeNode(HObject obj)

Parameters:

obj - the object to find

Returns:

the tree node that contains the given data object.