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TreeNode.cpp
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TreeNode.cpp
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#include "TreeNode.h"
//constructor
TreeNode::TreeNode(DBentry* _entryPtr) {
this -> entryPtr = _entryPtr;
this -> left = NULL;
this -> right = NULL;
}
//destructor
TreeNode::~TreeNode() {
delete entryPtr;
}
//set left child of TreeNode
void TreeNode::setLeft(TreeNode* newLeft) {
this -> left = newLeft;
}
//set right child of TreeNode
void TreeNode::setRight(TreeNode* newRight) {
this -> right = newRight;
}
//get left child of TreeNode
TreeNode* TreeNode::getLeft() const {
return left;
}
//get right child of TreeNode
TreeNode* TreeNode::getRight() const {
return right;
}
//return pointer to DBentry the TreeNode contains
DBentry* TreeNode::getEntry() const {
return entryPtr;
}
//function to re-attach two subtrees to above node
void TreeNode::removeHelper(TreeNode*& node) {
if (right == NULL)
return;
if (right -> left == NULL) {
right = node;
return;
}
TreeNode* temp = right -> left;
removeHelper(right -> left);
temp -> right = right;
temp -> left = left;
node = temp;
}
//remove a node with the given name and re-attach the left and right subtrees to the above node
bool TreeNode::remove(string name, TreeNode*& node) {
string currentNodeName = node -> getEntry()-> getName();
if (name.compare(currentNodeName) > 0) {
if (right == NULL)
return false;
else
return right -> remove(name, right);
}
else if (name.compare(currentNodeName) < 0) {
if (left == NULL)
return false;
else return left -> remove(name, left);
}
if (name.compare(currentNodeName) == 0) {
if (left == NULL && right == NULL) {
node = NULL;
delete this;
}
else if (left == NULL && right != NULL) {
node = right;
delete this;
}
else if (left != NULL && right == NULL) {
node = left;
delete this;
}
else {
removeHelper(node);
delete this;
}
return true;
}
}