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Diffstat (limited to 'src/de/lmu/ifi/dbs/elki/utilities/datastructures/heap/ComparableMaxHeap.java')
-rw-r--r-- | src/de/lmu/ifi/dbs/elki/utilities/datastructures/heap/ComparableMaxHeap.java | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/src/de/lmu/ifi/dbs/elki/utilities/datastructures/heap/ComparableMaxHeap.java b/src/de/lmu/ifi/dbs/elki/utilities/datastructures/heap/ComparableMaxHeap.java new file mode 100644 index 00000000..ab8ef1bb --- /dev/null +++ b/src/de/lmu/ifi/dbs/elki/utilities/datastructures/heap/ComparableMaxHeap.java @@ -0,0 +1,63 @@ +package de.lmu.ifi.dbs.elki.utilities.datastructures.heap; + +/* + This file is part of ELKI: + Environment for Developing KDD-Applications Supported by Index-Structures + + Copyright (C) 2012 + Ludwig-Maximilians-Universität München + Lehr- und Forschungseinheit für Datenbanksysteme + ELKI Development Team + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU Affero General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU Affero General Public License for more details. + + You should have received a copy of the GNU Affero General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + */ + +/** + * Basic in-memory heap structure. + * + * This heap is built lazily: if you first add many elements, then poll the + * heap, it will be bulk-loaded in O(n) instead of iteratively built in O(n log + * n). This is implemented via a simple validTo counter. + * + * @author Erich Schubert + */ +public class ComparableMaxHeap<K extends Comparable<K>> extends ObjectHeap<K> { + /** + * Constructor with default capacity. + */ + public ComparableMaxHeap() { + super(DEFAULT_INITIAL_CAPACITY); + } + + /** + * Constructor with initial capacity. + * + * @param size initial capacity + */ + public ComparableMaxHeap(int size) { + super(size); + } + + /** + * Compare two objects + * + * @param o1 First object + * @param o2 Second object + */ + @Override + @SuppressWarnings("unchecked") + protected boolean comp(Object o1, Object o2) { + return ((K) o1).compareTo((K) o2) < 0; + } +} |