Pretty print in BInaryHeap
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Le Botlan
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@ -1,19 +1,14 @@
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//
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// ******************PUBLIC OPERATIONS*********************
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// void insert( x ) --> Insert x
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// Comparable deleteMin( )--> Return and remove smallest item
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// Comparable findMin( ) --> Return smallest item
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// boolean isEmpty( ) --> Return true if empty; else false
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// ******************ERRORS********************************
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// Throws RuntimeException for findMin and deleteMin when empty
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package org.insa.algo.utils;
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import java.util.ArrayList;
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/**
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* Implements a binary heap. Note that all "matching" is based on the compareTo
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* method.
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* Implements a binary heap containing elements of type E.
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*
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* Note that all comparisons are based on the compareTo method,
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* hence E must implement Comparable
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*
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* @author Mark Allen Weiss
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* @author DLB
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@ -57,6 +52,7 @@ public class BinaryHeap<E extends Comparable<E>> implements PriorityQueue<E> {
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else {
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this.array.set(index, value);
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}
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}
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/**
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@ -163,41 +159,153 @@ public class BinaryHeap<E extends Comparable<E>> implements PriorityQueue<E> {
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return minItem;
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}
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/**
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* Prints the heap
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/* This class is used by toString_tree.
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* It is just a triple of strings. Could it be made simpler in Java ?
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*
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* Printing context, functional style.
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*/
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public void print() {
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System.out.println();
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System.out.println("======== HEAP (size = " + this.currentSize + ") ========");
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System.out.println();
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private class Context {
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/* Output text */
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public final String acu ;
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for (int i = 0; i < this.currentSize; i++) {
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System.out.println(this.array.get(i).toString());
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/* margin: the margin to get back exactly under the current position on the next line. */
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public final String margin ;
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/* lastmargin: margin used for the last child of a node. The markers are different. */
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public final String lastmargin ;
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public Context(String a, String b, String c) {
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this.acu = a ;
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this.margin = b ;
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this.lastmargin = c ;
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}
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System.out.println();
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System.out.println("-------- End of heap --------");
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System.out.println();
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/* Appends newlines. */
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public Context nl(int n) {
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if (n <= 0) { return this ; }
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else {
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String acu2 = this.acu + "\n" + this.margin ;
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return (new Context(acu2, this.margin, this.lastmargin).nl(n-1)) ;
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}
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}
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/* Adds some text */
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public Context add(Integer count, String s) {
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int cnt = (count==null) ? s.length() : count ;
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String spaces = new String(new char[cnt]).replace('\0', ' ');
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return new Context(this.acu + s, this.margin + spaces, this.lastmargin + spaces) ;
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}
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/* Adds a branch */
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public Context br(Integer count, String label) {
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Context ctxt = this.add(count, label) ;
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if (count == null) {
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return new Context(ctxt.acu + "_",
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ctxt.margin + "|",
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ctxt.margin + " ") ;
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}
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else {
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return new Context(ctxt.acu,
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ctxt.margin + "|",
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ctxt.margin + " ").nl(1) ;
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}
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}
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}
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/**
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* Prints the elements of the heap according to their respective order.
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*/
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public void printSorted() {
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/* Input : ready to write the current node at the current context position.
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* Output : the last character of acu is the last character of the current node. */
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public Context toString_loop(Context ctxt, int node, int max_depth) {
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if (max_depth < 0) { return ctxt.add(null,"...") ; }
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else {
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E nodeval = this.array.get(node) ;
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String nodevals = nodeval.toString() ;
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ArrayList<Integer> childs = new ArrayList<Integer>() ;
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// Add childs
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int index_left = this.index_left(node) ;
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int index_right = index_left + 1 ;
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if (index_left < this.currentSize) { childs.add(index_left) ; }
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if (index_right < this.currentSize) { childs.add(index_right) ; }
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Context ctxt2 = childs.isEmpty() ? ctxt.add(null,nodevals) : ctxt.br(1, nodevals) ;
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for (int ch = 0 ; ch < childs.size() ; ch++) {
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boolean is_last = (ch == childs.size() - 1) ;
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int child = childs.get(ch) ;
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if (is_last) {
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Context ctxt3 = new Context( ctxt2.acu, ctxt2.lastmargin, ctxt2.lastmargin) ;
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ctxt2 = new Context( this.toString_loop(ctxt3.add(null, "___"),child,max_depth-1).acu,
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ctxt2.margin,
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ctxt2.lastmargin) ;
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}
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else {
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ctxt2 = new Context(this.toString_loop(ctxt2.add(null,"___"),child,max_depth-1).acu,
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ctxt2.margin,
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ctxt2.lastmargin).nl(2) ;
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}
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}
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return ctxt2 ;
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}
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}
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// Textual representation of the tree.
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public String toString_tree(int max_depth) {
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Context init_context = new Context(" ", " ", " ") ;
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Context result = this.toString_loop(init_context, 0, max_depth) ;
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return result.acu ;
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}
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// Prints the elements, sorted.
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// max_elements: maximal number of elements printed. -1 for infinity.
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public String toString_sorted(int max_elements) {
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String result = "\n" ;
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BinaryHeap<E> copy = new BinaryHeap<E>(this);
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System.out.println();
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System.out.println("======== Sorted HEAP (size = " + this.currentSize + ") ========");
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System.out.println();
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int remaining = max_elements ;
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while (!copy.isEmpty()) {
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System.out.println(copy.deleteMin());
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String truncate = "" ;
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if (max_elements < 0 || max_elements >= this.currentSize) {
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truncate = "" ;
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} else {
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truncate = ", only " + max_elements + " elements are shown";
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}
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System.out.println();
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System.out.println("-------- End of heap --------");
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System.out.println();
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result += "======== Sorted HEAP (size = " + this.currentSize + truncate + ") ========\n\n" ;
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while (!copy.isEmpty() && remaining != 0) {
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result += copy.deleteMin() + "\n" ;
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remaining-- ;
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}
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result += "\n-------- End of heap --------\n\n" ;
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return result ;
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}
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public String toString() {
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return this.toString_tree(8) ;
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}
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/*
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public static void main(String[] args) {
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BinaryHeap<Integer> heap = new BinaryHeap<Integer>() ;
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for (int i = 0 ; i < 50 ; i++) {
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heap.insert(i) ;
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}
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System.out.println(heap.toString_tree(4)) ;
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}
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*/
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}
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