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HSQLDB example source code file (HashSet.java)
The HSQLDB HashSet.java source code/* Copyright (c) 2001-2008, The HSQL Development Group * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of the HSQL Development Group nor the names of its * contributors may be used to endorse or promote products derived from this * software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG, * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ package org.hsqldb.lib; import org.hsqldb.store.BaseHashMap; /** * This class does not store null keys. * * @author fredt@users * @version 1.7.2 * @since 1.7.2 */ public class HashSet extends BaseHashMap implements Set { public HashSet() { this(16, 0.75f); } public HashSet(int initialCapacity) throws IllegalArgumentException { this(initialCapacity, 0.75f); } public HashSet(int initialCapacity, float loadFactor) throws IllegalArgumentException { super(initialCapacity, loadFactor, BaseHashMap.objectKeyOrValue, BaseHashMap.noKeyOrValue, false); } public boolean contains(Object key) { return super.containsKey(key); } public Object get(Object key) { int lookup = getLookup(key, key.hashCode()); if (lookup < 0) { return null; } else { return objectKeyTable[lookup]; } } public boolean add(Object key) { int oldSize = size(); super.addOrRemove(0, 0, key, null, false); return oldSize != size(); } public boolean addAll(Collection c) { int oldSize = size(); Iterator it = c.iterator(); while (it.hasNext()) { add(it.next()); } return oldSize != size(); } public boolean addAll(Object[] keys) { boolean changed = false; for (int i = 0; i < keys.length; i++) { if (add(keys[i])) { changed = true; } } return changed; } public boolean remove(Object key) { int oldSize = size(); super.removeObject(key); return oldSize != size(); } public Object[] toArray(Object[] a) { if (a == null || a.length < size()) { a = new Object[size()]; } Iterator it = iterator(); for (int i = 0; it.hasNext(); i++) { a[i] = it.next(); } return a; } public Iterator iterator() { return new BaseHashIterator(true); } /** * Returns a String like "[Drei, zwei, Eins]", exactly like * java.util.HashSet. */ public String toString() { Iterator it = iterator(); StringBuffer sb = new StringBuffer(); while (it.hasNext()) { if (sb.length() > 0) { sb.append(", "); } else { sb.append('['); } sb.append(it.next()); } return sb.toString() + ']'; } } Other HSQLDB examples (source code examples)Here is a short list of links related to this HSQLDB HashSet.java source code file: |
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