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Class semper.transfer.Node

java.lang.Object
   |
   +----semper.transfer.Node

public class Node

extends Object

implements Streamable

The main storing element is a TransferData object called node content. Also there is the node type which categorizes the node. It could be 'internal' 'payment' or 'statement'. Next There's the content description.

Another important data are the security attributes. There are two of them, one for the node itself (the NodeAttributes) and the other for the subcontainer (or subtree) called subConAttributes. The security attributes are objects of the Security class.

__nodeCount

Class variable to provide a unique identification of the node.

Node()

Simple default Constructor without arguments.

Node(String)

Constructor with nodeType.

delContentDescr()

Deletes the Content Description of the node.

delNodeAttributes(int[])

Deletes the node security attributes (all attributes are reset).

delNodeCont()

Deletes the Content of the node.

delNodeType()

Deletes the node type.

delSubConAttributes(int[])

Deletes the subcontainer security attributes.

existChild()

Tests if the children vector is empty.

getChildren()

Retrieves the vector that contains the reeferences to the children of the node.

getContainerID()

Extracts the ContainerID.

getContentDescr()

Extracts the Content Description of the given node.

getFather()

Retrieves a reference to the father node.

getFatherID()

Gets the father's NodeID.

getNodeAttributes()

Gets the node security attributes.

getNodeContent()

Gets the node content.

getNodeID()

Gets the NodeID.

getNodeType()

Extracts the node type.

getSubConAttributes()

Gets the subcontainer security attributes.

getTransferContent()

Getting the transfer content of the node content directly.

insertChild(Node)

Appends the reference to a node at the children vector.

makeToNode(String)

Reconverts a String to a Node

makeToString()

Writes the node data into a string.

myStreamSize()

The size of a stream made from this object is computed.

print()

Prints information of the Node (on STDOUT)

readObject(StreamInputInterface)

Reads a node from a stream.

setContainerID(String)

Sets the container ID of a node.

setContentDescr(String)

Inserts the content description into the node.

setFather(Node)

Sets a reference to the father in the container tree structure.

setFatherID(String)

The method sets the father ID of the node.

setNodeAttributes(int[])

Sets the node security attributes.

setNodeAttributes(Security)

Sets the node security attributes.

setNodeContent(TransferData)

Inserts the content into the node.

setNodeType(String)

Inserts the node type.

setSubConAttributes(int[])

Sets the subcontainer security attributes.

setSubConAttributes(Security)

Sets the subcontainer security attributes.

setTransferContent(String)

Sets the transfer content of the node content.

writeObject(StreamOutputInterface)

Writes the container into a stream.

  public static int __nodeCount

Class variable to provide a unique identification of the node. This index is used with the prefix 'N' to build the NodeID.

  public Node()

Simple default Constructor without arguments. This constructor builds only a new NodeId. The other elements contain no data. The Security objects use the default constructor, so all the attributes are not set.

  public Node(String NodeType)

Constructor with nodeType. The same constructor as above, only the nodeType is set to the parameter string. There is no check of the validity of this string. All security attributes are false.

Parameters:

NodeType - specifies the node type (i.e statement)

  public String getNodeID()

Gets the NodeID.

Returns:

the node ID

  public String getFatherID()

Gets the father's NodeID.

Returns:

a unique name of the node's father

  protected void setFatherID(String father_ID)

The method sets the father ID of the node. This ID is important for the building of containers.

Parameters:

father_ID - a unique name of the node's father

See Also:

Container

  public void setContainerID(String ContainerID)

Sets the container ID of a node.

  public String getContainerID()

Extracts the ContainerID.

Returns:

the container ID

  public void setNodeType(String NodeType)

Inserts the node type.

Parameters:

NodeType - specifies the node type (i.e statement)

  public String getNodeType()

Extracts the node type.

Returns:

the node type (i.e statement)

  public void delNodeType()

Deletes the node type.

  public void setNodeContent(TransferData NodeContent)

Inserts the content into the node. The nodeType is a TransferData object which is quiet the same as a CLContentData object, only it extends the Streamable class.

Parameters:

NodeContent - the data wich is transfered by this node

  public void setTransferContent(String transfer_content)

Sets the transfer content of the node content. This is a shortway setting the transfer content. It is not necessary to get first the node content and then set the transfer content and then write it back.

Parameters:

transfer_content - the contend of the node

See Also:

TransferData

  public String getTransferContent()

Getting the transfer content of the node content directly.

Returns:

the data which is transfered by this Node

See Also:

TransferData

  public TransferData getNodeContent()

Gets the node content. The node content is a TransferData Object.

Returns:

the data which is transfered by this Node

See Also:

TransferData, getTransferContent

  public void delNodeCont()

Deletes the Content of the node.

  public void setContentDescr(String ContentDescr)

Inserts the content description into the node.

Parameters:

ContentDescr - a description about the data which is transfered by this Node

  public String getContentDescr()

Extracts the Content Description of the given node.

Returns:

a description about the data which is transfered by this Node

  public void delContentDescr()

Deletes the Content Description of the node.

  public void setNodeAttributes(int Attribute_list[])

Sets the node security attributes. You can give a list of attributes you want to be set. For example you want MESSAGE_CONFIDENTIALITY and ANONIMITY_BY_ALIAS you have to give an integer array [0, 3] as parameter. Of course the array should not be larger than SEC_ATTR_MAX.

Parameters:

Attribute_list - an array which holds the security attributes

See Also:

Security

  public void setNodeAttributes(Security SecAttr)

Sets the node security attributes.

Parameters:

SecAttr - describes the security features to be used at the transaction

See Also:

Security

  public Security getNodeAttributes()

Gets the node security attributes. The returned value is a copy of the attributes not a reference!

Returns:

an object of the class Security that describes the security features to be used at the transaction

See Also:

Security

  public void delNodeAttributes(int Attribute_list[])

Deletes the node security attributes (all attributes are reset).

Parameters:

Attribute_list - an array of that describes the security features to be used at the transaction

See Also:

Security

  public void setSubConAttributes(int Attribute_list[])

Sets the subcontainer security attributes. For detailed explanation see setNodeAttributes(int[] Attribute_list).

Parameters:

Attribute_list - an array of that describes the security features to be used at the transaction

See Also:

Security

  public void setSubConAttributes(Security SecAttr)

Sets the subcontainer security attributes.

Parameters:

SecAttr - describes the security features to be used at the transaction

See Also:

Security

  public Security getSubConAttributes()

Gets the subcontainer security attributes. The returned value is a copy of the attributes not a reference!

Returns:

an object of the class Security that describes the security features to be used at the transaction

See Also:

Security

  public void delSubConAttributes(int Attribute_list[])

Deletes the subcontainer security attributes.

Parameters:

Attribute_list - an array of that describes the security features to be used at the transaction

  public void insertChild(Node Child)

Appends the reference to a node at the children vector.

Parameters:

Child - the child to be inserted

  public Vector getChildren()

Retrieves the vector that contains the reeferences to the children of the node.

Returns:

a vector which holds the children of this node

  public boolean existChild()

Tests if the children vector is empty.

Returns:

true if the node has any child

  public void setFather(Node Father)

Sets a reference to the father in the container tree structure. If the param node is null, this node has no father (for example the root of a container or a single node) and the father ID is set to the node's ID. Else the father ID of the node is set to node ID of the param node.

Parameters:

Father - the node that is set as this node's father

  public Node getFather()

Retrieves a reference to the father node.

Returns:

the node that is set as this node's father

  public void writeObject(StreamOutputInterface s) throws StreamIOException

Writes the container into a stream. All the data of a node is written into a stream which can then be wrote into a file, socket or string.

Parameters:

stream - the stream of data the object state is recorded in

Throws: StreamIOException

If a subobject does not implement the Streamable interface.

  public void readObject(StreamInputInterface s) throws StreamIOException

Reads a node from a stream. This method can read a node out of a file, socket or string.

Parameters:

stream - the stream of data the object state is retrieved from

Throws: StreamIOException

If a class is not present or the input data is corrupt

  public int myStreamSize() throws StreamIOException

The size of a stream made from this object is computed. There is one byte added for version number of the communication block.

Returns:

the size of the stream

Throws: StreamIOException

if the size of a Node could not be got

  public String makeToString() throws StreamIOException

Writes the node data into a string.

Returns:

the String made of this node

Throws: StreamIOException

is thrown if an error occurse during creating or accessing the Stream classes

  public void makeToNode(String string) throws StreamIOException

Reconverts a String to a Node

Parameters:

string - the String to be converted

Throws: StreamIOException

is thrown if an error occurse during creating or accessing the Stream classes

  public void print()

Prints information of the Node (on STDOUT)

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