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Node.java
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Node.java
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public class Node {
public Node up;
public Node down;
public Node left;
public Node right;
public ColumnNode column;
// Node object points to adjacent nodes in left, right, up, and down directions
public Node() {
this.up = this.down = this.left = this.right = this;
}
public Node(ColumnNode column) {
this();
this.column = column;
}
// Insert node vertically by rearranging the node links below it
public Node insertVertically(Node node) {
node.down = this.down;
node.down.up = node;
node.up = this;
this.down = node;
return node;
}
// Insert node horizontally by rearranging the node to its right
public Node insertHorizontally(Node node) {
node.right = this.right;
node.right.left = node;
node.left = this;
this.right = node;
return node;
}
// Delete column by unlinking node from its horizontally adjacent nodes
public void deleteColumn() {
this.left.right = this.right;
this.right.left = this.left;
}
// Reinsert column by applying the saved links to its horizontal neighbors
public void insertColumn() {
this.left.right = this;
this.right.left = this;
}
// Delete row by unlinking node from its vertically adjacent nodes
public void deleteRow() {
this.up.down = this.down;
this.down.up = this.up;
}
// Reinsert row by applying the saved links to its vertical neighbors
public void insertRow() {
this.up.down = this;
this.down.up = this;
}
}