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java.lang.Objectorg.apache.jorphan.collections.SearchByClass
Useful for finding all nodes in the tree that represent objects of a particular type. For instance, if your tree contains all strings, and a few StringBuffer objects, you can use the SearchByClass traverser to find all the StringBuffer objects in your tree.
Usage is simple. Given a HashTree object "tree", and a SearchByClass
object:
HashTree tree = new HashTree();
// ... tree gets filled with objects
SearchByClass searcher = new SearchByClass(StringBuffer.class);
tree.traverse(searcher);
Iterator iter = searcher.getSearchResults().iterator();
while (iter.hasNext()) {
StringBuffer foundNode = (StringBuffer) iter.next();
HashTree subTreeOfFoundNode = searcher.getSubTree(foundNode);
// .... do something with node and subTree...
}
HashTree,
HashTreeTraverser| Constructor Summary | |
SearchByClass()
Creates an instance of SearchByClass. |
|
SearchByClass(Class searchClass)
Creates an instance of SearchByClass, and sets the Class to be searched for. |
|
| Method Summary | |
void |
addNode(Object node,
HashTree subTree)
The tree traverses itself depth-first, calling addNode for each object it encounters as it goes. |
Collection |
getSearchResults()
After traversing the HashTree, call this method to get a collection of the nodes that were found. |
HashTree |
getSubTree(Object root)
Given a specific found node, this method will return the sub tree of that node. |
void |
processPath()
Process path is called when a leaf is reached. |
void |
subtractNode()
Indicates traversal has moved up a step, and the visitor should remove the top node from its stack structure. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Constructor Detail |
public SearchByClass()
public SearchByClass(Class searchClass)
searchClass - | Method Detail |
public Collection getSearchResults()
public HashTree getSubTree(Object root)
root - the node for which the sub tree is requested
public void addNode(Object node,
HashTree subTree)
HashTreeTraverser
addNode in interface HashTreeTraversernode - the node currently encounteredsubTree - the HashTree under the node encounteredpublic void subtractNode()
HashTreeTraverser
subtractNode in interface HashTreeTraverserpublic void processPath()
HashTreeTraverserHashTreeTraverser.subtractNode() call. This is a callback method, and should
not be called except by a HashTree during traversal.
processPath in interface HashTreeTraverser
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