org.das2.util.catalog

Class DasAbstractNode

java.lang.Object

org.das2.util.catalog.DasAbstractNode

All Implemented Interfaces:

DasNode

Direct Known Subclasses:

DasDirNodeCat, DasNodeFactory.SupraNode, DasSrcNodeHttpGet

public abstract class DasAbstractNode
extends java.lang.Object
implements DasNode

All nodes loadable by the DasNodeFactory should inherit from this abstract class. Since java interfaces cannot define package private members, I have to resort to an abstract class in order to have the type system enforce the fact that all nodes must provide a package private load() member.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
class	DasAbstractNode.LoadResult

Field Summary

Fields

Modifier and Type	Field and Description
protected DasDirNode	parent

Constructor Summary

Constructors

Constructor and Description
DasAbstractNode()

Method Summary

Modifier and Type	Method and Description
DasNode	getRootNode() Return the highest node reachable by this catalog node.
boolean	isRootNode() Is this object a detached root of a catalog tree.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface org.das2.util.catalog.DasNode

isDataSource, name, type

Field Detail

parent

protected DasDirNode parent

Constructor Detail

DasAbstractNode

public DasAbstractNode()

Method Detail

isRootNode

public boolean isRootNode()

Description copied from interface: DasNode

Is this object a detached root of a catalog tree. Note that the build in root URLs are always detached roots because there is no higher node to find.

Specified by:

isRootNode in interface DasNode

Returns:

true if no higher node is reachable from this one.

getRootNode

public DasNode getRootNode()

Description copied from interface: DasNode

Return the highest node reachable by this catalog node.

Specified by:

getRootNode in interface DasNode

Returns:

the highest node reachable by this catalog node, which may just be itself.