org.gcube.data.trees.data

Class Leaf

java.lang.Object

org.gcube.data.trees.data.Node

org.gcube.data.trees.data.Leaf

public class Leaf
extends Node

A leaf Node.

Author:

Fabio Simeoni

Nested Class Summary

Nested classes/interfaces inherited from class org.gcube.data.trees.data.Node

Node.State

Constructor Summary

Constructors

Constructor and Description
Leaf(Leaf leaf) Copy constructor, creates an instance as a clone of a given Leaf.
Leaf(String id) Creates an instance with a given identifier.
Leaf(String v, Map<QName,String> attributes) Creates an instance with given attributes and a given value.
Leaf(String id, Node.State state, String v, Map<QName,String> attributes) Creates an instance with a given identifier, given attributes, and a given value.
Leaf(String id, String v) Creates an instance with a given identifier and a given value.

Method Summary

Modifier and Type	Method and Description
void	delete() Marks the node as Node.State.DELETED, removing all its attributes and replacing its value with null.
protected Leaf	delta(Node f) Returns a node that reflects the delta between this node and a given input node.
boolean	equals(Object obj)
int	hashCode()
long	size() Returns the size of the tree rooted in this node, in bytes.
String	toString()
void	update(Node delta) Applies the changes captured by the delta node in input (cf.
String	value() Returns the inner value.
void	value(String v) Sets the inner value.

Methods inherited from class org.gcube.data.trees.data.Node

ancestors, ancestorsAndSelf, attribute, attribute, attributes, hasAttribute, hasAttribute, id, parent, removeAttribute, removeAttribute, setAttribute, setAttribute, setParent, state, state, uri, uri

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Leaf

public Leaf(Leaf leaf)

Copy constructor, creates an instance as a clone of a given Leaf.

Parameters:

leaf - the leaf.

Leaf

public Leaf(String id)

Creates an instance with a given identifier.

Parameters:

id - the identifier.

Leaf

public Leaf(String id,
            String v)

Creates an instance with a given identifier and a given value.

Parameters:

id - the identifier.

v - the value.

Leaf

public Leaf(String v,
            Map<QName,String> attributes)

Creates an instance with given attributes and a given value. * @param v the value.

Parameters:

attributes - the attributes.

Leaf

public Leaf(String id,
            Node.State state,
            String v,
            Map<QName,String> attributes)

Creates an instance with a given identifier, given attributes, and a given value.

Parameters:

id - the identifier.

v - the value.

attributes - the attributes.

Method Detail

value

public String value()

Returns the inner value.

Returns:

the value.

value

public void value(String v)
           throws IllegalArgumentException

Sets the inner value.

Parameters:

v - the value.

Throws:

IllegalArgumentException

delete

public void delete()

Marks the node as Node.State.DELETED, removing all its attributes and replacing its value with null.

Overrides:

delete in class Node

update

public void update(Node delta)
            throws IllegalStateException,
                   IllegalArgumentException

Applies the changes captured by the delta node in input (cf. delta(Node)).

This operation acts as the inverse of delta(Node). In particular:

removes all the attributes of the delta node with a value of null; adds all the attributes of the delta node with a non-null value which do no exist in this node; modifies all the attributes of the delta node that differ in value from those in this node; changes the value of this node to the value of the delta node.

Overrides:

update in class Node

Parameters:

delta - the delta node

Throws:

IllegalStateException - if this node has no identifier

IllegalArgumentException - if the delta node is not a leaf, or has an unexpected state, or its identifier differs form this node's, or more generally its attributes do not relate to those of this node as expected

delta

protected Leaf delta(Node f)
              throws IllegalArgumentException

Returns a node that reflects the delta between this node and a given input node.

The delta node can only be computed if the input node has the same identifier as this node. For all purposes, in fact, the input node is expected to be (or simply look like) a future version of this node, as if it was originally cloned from this node and had evolved since.

Under this assumption, the delta node has:

• all the attributes that no longer exist below the input node, but with nullvalue;
• all the attributes below the input node that do not exist yet below the current node;
• all the attributes below the input node that differ in value from those below this node;
• the value of the input node if this differ's from this node's.
• a state of Node.State.MODIFIED if, based on the rules above, the delta node actually differs from this node.

Overrides:

delta in class Node

Parameters:

f - the input node.

Throws:

IllegalArgumentException - if this node has no identifier or it has a different type or a different identifier than this node.

size

public long size()

Returns the size of the tree rooted in this node, in bytes.

Specified by:

size in class Node

Returns:

the size.

toString

public String toString()

Overrides:

toString in class Object

equals

public boolean equals(Object obj)

Overrides:

equals in class Node

hashCode

public int hashCode()

Overrides:

hashCode in class Node