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// Internal node for the PRQuadTree
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public class PRQuadTreeNodeInternal implements PRQuadTreeNode {
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// Node in each quadrant
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private PRQuadTreeNode NW;
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private PRQuadTreeNode NE;
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private PRQuadTreeNode SW;
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private PRQuadTreeNode SE;
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private PRQuadTreeNodeFlyweight flyweight; // Flyweight
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// Constructor to initialize the node with flyweights
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public PRQuadTreeNodeInternal(PRQuadTreeNodeFlyweight flyweight) {
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// Initialize all subnodes with the flyweight
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NW = NE = SW = SE = flyweight;
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this.flyweight = flyweight;
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}
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// Queries if all subnodes are flyweights
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public boolean isEmpty() {
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return (NW == flyweight)&&(NE == flyweight)&&
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(SW == flyweight)&&(SE == flyweight);
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}
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// Test if node contains other internal nodes
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public boolean containsAllLeavesOrFlyweight() {
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// Queries if all subnodes are either leaves or flyweights
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return (NW instanceof PRQuadTreeNodeLeaf || NW instanceof PRQuadTreeNodeFlyweight)&&
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(NE instanceof PRQuadTreeNodeLeaf || NE instanceof PRQuadTreeNodeFlyweight)&&
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(SW instanceof PRQuadTreeNodeLeaf || SW instanceof PRQuadTreeNodeFlyweight)&&
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(SE instanceof PRQuadTreeNodeLeaf || SE instanceof PRQuadTreeNodeFlyweight);
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}
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// Returns the number of all records in all subleaves
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public int countOfAllLeafNodes() {
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int ret = 0;
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if (NW instanceof PRQuadTreeNodeLeaf)
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ret += ((PRQuadTreeNodeLeaf) NW).getCount();
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if (NE instanceof PRQuadTreeNodeLeaf)
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ret += ((PRQuadTreeNodeLeaf) NE).getCount();
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if (SW instanceof PRQuadTreeNodeLeaf)
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ret += ((PRQuadTreeNodeLeaf) SW).getCount();
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if (SE instanceof PRQuadTreeNodeLeaf)
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ret += ((PRQuadTreeNodeLeaf) SE).getCount();
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return ret;
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}
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// Returns the number of records in a node if it is a leaf node
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public int countOfLeafNode(PRQuadTreeNode node) {
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if (node instanceof PRQuadTreeNodeLeaf)
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return ((PRQuadTreeNodeLeaf) node).getCount();
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else
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return 0;
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}
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// Encapsulation functions
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public PRQuadTreeNode getNW() {
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return NW;
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}
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public void setNW(PRQuadTreeNode nW) {
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NW = nW;
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}
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public PRQuadTreeNode getNE() {
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return NE;
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}
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public void setNE(PRQuadTreeNode nE) {
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NE = nE;
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}
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public PRQuadTreeNode getSW() {
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return SW;
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}
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public void setSW(PRQuadTreeNode sW) {
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SW = sW;
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}
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public PRQuadTreeNode getSE() {
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return SE;
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}
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public void setSE(PRQuadTreeNode sE) {
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SE = sE;
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}
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}
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