..........Composite Pattern[SD]

The composite pattern describes that a group of objects are to be treated in the same way as a single instance of an object.

The intent of a composite is to "compose" objects into tree structures to represent part-whole hierarchies. Implementing the composite pattern lets clients treat individual objects and compositions uniformly. An XmlDocument,TreeView are example of composite pattern.

public class TreeNode
{

priavte String m_sName = null;
priavte Arraylist m_arlstChilds = null;

public TreeNode()
{
m_arlstChilds=new Arraylist();
}

public String Name
{

get
{
return m_sName;
}

set
{
m_sName=value;
}

}


private String m_sValue = null;

public String Value
{

get
{
return m_sValue;
}

set
{
m_sValue=value;
}
}

public void AddNode(TreeNode objTreeNode)
{
m_arlsChilds.Add(objTreeNode);
}
}

public class CreateTree
{
TreeNode BookNode = new TreeNode(“Bible”,”Book”);
TreeNode ChapterNode1 = new TreeNode(“Chapter1”,”Chapter1”);
TreeNode ChapterNode2 = new TreeNode(“Chapter2”,”Chapter2”);
TreeNode ChapterNode3 = new TreeNode(“Chapter3”,”Chapter3”);

TreeNode SectionNode1 = new TreeNode(“Section1”,”Section1”);
TreeNode SectionNode2 = new TreeNode(“Section2”,”Section2”);


BookNode.Add(ChapterNode1);
BookNode.Add(ChapterNode2);
BookNode.Add(ChapterNode3);

ChapterNode1.Add(SectionNode1);
ChapterNode1.Add(SectionNode2);

}


Thus the Composite pattern allows you to create a tree like structure for simple and complex objects so they appear the same to the client.