huffmannode.java

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// Introduced in Chapter 17
/** Node in a Huffman tree. */
public class HuffmanNode extends BinaryNode<Character>
  implements Comparable<HuffmanNode> {

  /** Frequency of this letter or set of letters. */
  private int count;

  /** Create a node with no children. */
  public HuffmanNode(char letter, int count) {
    super(letter);
    this.count = count;
  }

  /**
   * Create a node with two children.  Its count is the sum of
   * its children's counts.
   */
  public HuffmanNode(HuffmanNode left, HuffmanNode right) {
    super('?', left, right);
    this.count = left.count + right.count;
  }

  /** The comparison is based on the counts of the nodes. */
  public int compareTo(HuffmanNode that) {
    return count - that.count;
  }

}