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Summary: Nested | Field | Method | Constr | Detail: Nested | Field | Method | Constr |
java.lang.Object
org.apache.jorphan.collections.HashTree
traverse(HashTreeTraverser)
method, which
provides an expedient way to traverse any HashTree by implementing the
HashTreeTraverser
interface in order to perform some operation on the
tree, or to extract information from the tree.
HashTreeTraverser
, SearchByClass
Field Summary | |
protected Map |
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Method Summary | |
void |
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void |
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HashTree |
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HashTree |
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void |
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HashTree |
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HashTree |
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protected HashTree |
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Object |
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protected void | |
boolean |
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boolean |
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protected HashTree |
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protected HashTree |
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protected HashTree |
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Set |
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boolean |
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Object |
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Object[] |
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Object[] |
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Object[] |
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HashTree |
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HashTree |
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HashTree |
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protected HashTree |
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int |
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boolean |
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Set |
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Collection |
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Collection |
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Collection |
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Collection |
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Object |
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void |
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Object |
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void |
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HashTree |
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void |
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void |
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public HashTree()
Creates an empty new HashTree.
public HashTree(Collection keys)
Creates a new HashTree and adds all the objects in the given collection as top-level nodes in the tree.
- Parameters:
keys
- a collection of objects to be added to the created HashTree.
protected HashTree(Map _map)
Allow subclasses to provide their own Map.
public HashTree(Object key)
Creates a new HashTree and adds the given object as a top-level node.
- Parameters:
key
-
public HashTree(Object[] keys)
Creates a new HashTree and adds all the objects in the given array as top-level nodes in the tree.
public void add(Collection keys)
Adds a bunch of keys into the HashTree at the current level.
- Parameters:
keys
- Collection of Keys to be added to HashTree.
public void add(Collection treePath, Collection values)
Adds a series of nodes into the HashTree using the given path. The first argument is a SortedSet that represents a path to a specific node in the tree. If the path doesn't already exist, it is created (the objects are added along the way). At the path, all the objects in the second argument are added as nodes.
- Parameters:
treePath
- a SortedSet of objects representing a pathvalues
- Collection of values to be added as keys to bottom-most node
public HashTree add(Collection treePath, Object value)
Adds a series of nodes into the HashTree using the given path. The first argument is a List that represents a path to a specific node in the tree. If the path doesn't already exist, it is created (the objects are added along the way). At the path, the object in the second argument is added as a node.
- Parameters:
treePath
- a list of objects representing a pathvalue
- Object to add as a node to bottom-most node
public void add(Collection treePath, Object[] values)
Adds a series of nodes into the HashTree using the given path. The first argument is a List that represents a path to a specific node in the tree. If the path doesn't already exist, it is created (the objects are added along the way). At the path, all the objects in the second argument are added as nodes.
- Parameters:
treePath
- a list of objects representing a pathvalues
- array of values to be added as keys to bottom-most node
public HashTree add(Object key)
Adds an key into the HashTree at the current level.
- Parameters:
key
- key to be added to HashTree
public void add(Object key, Collection values)
Adds a key as a node at the current level and then adds all the objects in the second argument as nodes of the new node.
- Parameters:
key
- key to be addedvalues
- Collection of objects to be added as keys in the secondary node
public HashTree add(Object key, Object value)
Adds a key and it's value in the HashTree. The first argument becomes a node at the current level, and the second argument becomes a node of it.
- Parameters:
key
- key to be addedvalue
- value to be added as a key in the secondary node
public void add(Object key, Object[] values)
Adds a key and it's values in the HashTree. The first argument becomes a node at the current level, and adds all the values in the array to the new node.
- Parameters:
key
- key to be addedvalues
- array of objects to be added as keys in the secondary node
public void add(Object key, HashTree subTree)
Adds a key as a node at the current level and then adds the given HashTree to that new node.
- Parameters:
key
- key to create in this treesubTree
- sub tree to add to the node created for the first argument.
public void add(Object[] keys)
Adds all the given objects as nodes at the current level.
- Parameters:
keys
- Array of Keys to be added to HashTree.
public void add(Object[] treePath, Collection values)
Adds a series of nodes into the HashTree using the given path. The first argument is an array that represents a path to a specific node in the tree. If the path doesn't already exist, it is created (the objects are added along the way). At the path, all the objects in the second argument are added as nodes.
- Parameters:
treePath
- an array of objects representing a pathvalues
- collection of values to be added as keys to bottom-most node
public void add(Object[] treePath, Object[] values)
Adds a series of nodes into the HashTree using the given path. The first argument is an array that represents a path to a specific node in the tree. If the path doesn't already exist, it is created (the objects are added along the way). At the path, all the objects in the second argument are added as nodes.
- Parameters:
treePath
- an array of objects representing a pathvalues
- array of values to be added as keys to bottom-most node
public void add(HashTree newTree)
Adds all the nodes and branches of the given tree to this tree. Is like merging two trees. Duplicates are ignored.
- Parameters:
newTree
-
public Object clone()
Create a clone of this HashTree. This is not a deep clone (ie, the contents of the tree are not cloned).
public boolean containsKey(Object o)
If the HashTree contains the given object as a key at the top level, then a true result is returned, otherwise false.
- Parameters:
o
- Object to be tested as a key.
- Returns:
- True if the HashTree contains the key, false otherwise.
- See Also:
Map.containsKey(Object)
public boolean containsValue(Object value)
Implemented as required by the Map interface, but is not very useful here. All 'values' in a HashTree are HashTree's themselves.
- Parameters:
value
- Object to be tested as a value.
- Returns:
- True if the HashTree contains the value, false otherwise.
- See Also:
Map.containsValue(Object)
protected HashTree createNewTree()
Creates a new tree. This method exists to allow inheriting classes to generate the appropriate types of nodes. For instance, when a node is added, it's value is a HashTree. Rather than directly calling the HashTree() constructor, the createNewTree() method is called. Inheriting classes should override these methods and create the appropriate subclass of HashTree.
- Returns:
- HashTree
protected HashTree createNewTree(Collection values)
Creates a new tree. This method exists to allow inheriting classes to generate the appropriate types of nodes. For instance, when a node is added, it's value is a HashTree. Rather than directly calling the HashTree() constructor, the createNewTree() method is called. Inheriting classes should override these methods and create the appropriate subclass of HashTree.
- Returns:
- HashTree
protected HashTree createNewTree(Object key)
Creates a new tree. This method exists to allow inheriting classes to generate the appropriate types of nodes. For instance, when a node is added, it's value is a HashTree. Rather than directly calling the HashTree() constructor, the createNewTree() method is called. Inheriting classes should override these methods and create the appropriate subclass of HashTree.
- Returns:
- HashTree
public boolean equals(Object o)
Compares all objects in the tree and verifies that the two trees contain the same objects at the same tree levels. Returns true if they do, false otherwise.
- Parameters:
o
- Object to be compared against
- See Also:
Object.equals(Object)
public Object get(Object key)
Returns the HashTree object associated with the given key. Same as callinggetTree(Object)
.
- See Also:
Map.get(Object)
public Object[] getArray()
Gets an array of all keys in the current HashTree node. If the HashTree represented a file system, this would be like getting an array of all the files in the current folder.
- Returns:
- array of all keys in this HashTree.
public Object[] getArray(Collection treePath)
Recurses down into the HashTree stucture using each subsequent key in the treePath argument, and returns an array of keys of the HashTree object at the end of the recursion. If the HashTree represented a file system, this would be like getting a list of all the files in a directory specified by the treePath, relative from the current directory.
- Parameters:
treePath
- list of keys used to recurse into HashTree structure
- Returns:
- array of all keys found in end HashTree
public Object[] getArray(Object key)
Gets an array of all keys in the HashTree mapped to the given key of the current HashTree object (in other words, one level down). If the HashTree represented a file system, this would like getting a list of all files in a sub-directory (of the current directory) specified by the key argument.
- Parameters:
key
- key used to find HashTree to get list of
- Returns:
- array of all keys in found HashTree
public Object[] getArray(Object[] treePath)
Recurses down into the HashTree stucture using each subsequent key in the array of keys, and returns an array of keys of the HashTree object at the end of the recursion. If the HashTree represented a file system, this would be like getting a list of all the files in a directory specified by the treePath, relative from the current directory.
- Parameters:
treePath
- array of keys used to recurse into HashTree structure
- Returns:
- array of all keys found in end HashTree
public HashTree getTree(Collection treePath)
Gets the HashTree object mapped to the last key in the SortedSet by recursing through the HashTree structure one key at a time.
- Parameters:
treePath
- Collection of keys
- Returns:
- HashTree at the end of the recursion
public HashTree getTree(Object key)
Gets the HashTree mapped to the given key.
- Parameters:
key
- Key used to find appropriate HashTree()
public HashTree getTree(Object[] treePath)
Gets the HashTree object mapped to the last key in the array by recursing through the HashTree structure one key at a time.
- Parameters:
treePath
- array of keys.
- Returns:
- HashTree at the end of the recursion.
public boolean isEmpty()
If the HashTree is empty, true is returned, false otherwise.
- Returns:
- True if HashTree is empty, false otherwise.
public Set keySet()
Returns a Set of all the keys in the top-level of this HashTree.
- See Also:
Map.keySet()
public Collection list()
Gets a Collection of all keys in the current HashTree node. If the HashTree represented a file system, this would be like getting a collection of all the files in the current folder.
- Returns:
- Set of all keys in this HashTree
public Collection list(Collection treePath)
Recurses down into the HashTree stucture using each subsequent key in the List of keys, and returns the Set of keys of the HashTree object at the end of the recursion. If the HashTree represented a file system, this would be like getting a list of all the files in a directory specified by the treePath, relative from the current directory.
- Parameters:
treePath
- List of keys used to recurse into HashTree structure
- Returns:
- Set of all keys found in end HashTree
public Collection list(Object key)
Gets a Set of all keys in the HashTree mapped to the given key of the current HashTree object (in other words, one level down. If the HashTree represented a file system, this would like getting a list of all files in a sub-directory (of the current directory) specified by the key argument.
- Parameters:
key
- key used to find HashTree to get list of
- Returns:
- Set of all keys in found HashTree.
public Collection list(Object[] treePath)
Recurses down into the HashTree stucture using each subsequent key in the array of keys, and returns the Set of keys of the HashTree object at the end of the recursion. If the HashTree represented a file system, this would be like getting a list of all the files in a directory specified by the treePath, relative from the current directory.
- Parameters:
treePath
- Array of keys used to recurse into HashTree structure
- Returns:
- Set of all keys found in end HashTree
public Object put(Object key, Object value)
This is the same as calling HashTree.add(key,value).
- Parameters:
key
- to usevalue
- to store against key
- See Also:
Map.put(Object, Object)
public void putAll(Map map)
The Map given must also be a HashTree, otherwise an UnsupportedOperationException is thrown. If it is a HashTree, this is like calling the add(HashTree) method.
- See Also:
add(HashTree)
,Map.putAll(Map)
public Object remove(Object key)
Removes the entire branch specified by the given key.
- See Also:
Map.remove(Object)
public void replace(Object currentKey, Object newKey)
Finds the given current key, and replaces it with the given new key. Any tree structure found under the original key is moved to the new key.
public HashTree search(Object key)
Searches the HashTree structure for the given key. If it finds the key, it returns the HashTree mapped to the key. If it finds nothing, it returns null.
- Parameters:
key
- Key to search for
- Returns:
- HashTree mapped to key, if found, otherwise
null
public void set(Collection values)
Sets the nodes of the current tree to be the objects of the given collection. Any nodes previously in the tree are removed.
- Parameters:
values
- Collection of objects to set as nodes.
public void set(Collection treePath, Collection values)
Sets a series of keys into the HashTree. It sets up the first object in the key list as a key in the current node, recurses into the next HashTree node through that key and adds the second object in the list. Continues recursing in this manner until the end of the first list is reached, at which point all the values of the Collection of values are set as keys to the bottom-most node. Any previously existing keys of that bottom node are lost.
- Parameters:
treePath
- list of keys to put into HashTreevalues
- collection of values to be added as keys to bottom-most node
public void set(Collection treePath, Object[] values)
Sets a series of keys into the HashTree. It sets up the first object in the key list as a key in the current node, recurses into the next HashTree node through that key and adds the second object in the list. Continues recursing in this manner until the end of the first list is reached, at which point all the values of the array of values are set as keys to the bottom-most node. Any previously existing keys of that bottom node are removed.
- Parameters:
treePath
- collection of keys to put into HashTreevalues
- array of values to be added as keys to bottom-most node
public void set(Object key, Collection values)
Sets a key and its values in the HashTree. It sets up a key in the current node, and then creates a node for that key, and set all the values in the array as keys in the new node. Any keys previously held under the given key are removed.
- Parameters:
key
- key to be set upvalues
- Collection of objects to be added as keys in the secondary node
public void set(Object key, Object value)
Sets a key and it's value in the HashTree. It actually sets up a key, and then creates a node for the key and sets the value to the new node, as a key. Any previous nodes that existed under the given key are lost.
- Parameters:
key
- key to be set upvalue
- value to be set up as a key in the secondary node
public void set(Object key, Object[] values)
Sets a key and its values in the HashTree. It sets up a key in the current node, and then creates a node for that key, and sets all the values in the array as keys in the new node. Any keys previously held under the given key are lost.
- Parameters:
key
- Key to be set upvalues
- Array of objects to be added as keys in the secondary node
public void set(Object key, HashTree t)
Sets a key into the current tree and assigns it a HashTree as its subtree. Any previous entries under the given key are removed.
- Parameters:
key
- key to be set upt
- HashTree that the key maps to
public void set(Object[] treePath, Collection values)
Sets a series of keys into the HashTree. It sets up the first object in the key array as a key in the current node, recurses into the next HashTree node through that key and adds the second object in the array. Continues recursing in this manner until the end of the first array is reached, at which point all the values of the Collection of values are set as keys to the bottom-most node. Any keys previously held by the bottom-most node are lost.
- Parameters:
treePath
- array of keys to put into HashTreevalues
- Collection of values to be added as keys to bottom-most node
public void set(Object[] treePath, Object[] values)
Sets a series of keys into the HashTree. It sets up the first object in the key array as a key in the current node, recurses into the next HashTree node through that key and adds the second object in the array. Continues recursing in this manner until the end of the first array is reached, at which point all the values of the second array are set as keys to the bottom-most node. All previous keys of that bottom-most node are removed.
- Parameters:
treePath
- array of keys to put into HashTreevalues
- array of values to be added as keys to bottom-most node
public String toString()
Generate a printable representation of the tree.
- Returns:
- a representation of the tree
public void traverse(HashTreeTraverser visitor)
Allows any implementation of the HashTreeTraverser interface to easily traverse (depth-first) all the nodes of the HashTree. The Traverser implementation will be given notification of each node visited.
- See Also:
HashTreeTraverser
public Collection values()
Returns a collection of all the sub-trees of the current tree.
- See Also:
Map.values()