| /******************************************************************************* |
| * Copyright (c) 2000, 2009 IBM Corporation and others. |
| * |
| * This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License 2.0 |
| * which accompanies this distribution, and is available at |
| * https://www.eclipse.org/legal/epl-2.0/ |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.jdt.internal.core.builder; |
| |
| import org.eclipse.jdt.core.compiler.CharOperation; |
| |
| public final class NameSet { |
| |
| // to avoid using Enumerations, walk the individual values skipping nulls |
| public char[][] names; |
| public int elementSize; // number of elements in the table |
| public int threshold; |
| |
| public NameSet(int size) { |
| this.elementSize = 0; |
| this.threshold = size; // size represents the expected number of elements |
| int extraRoom = (int) (size * 1.5f); |
| if (this.threshold == extraRoom) |
| extraRoom++; |
| this.names = new char[extraRoom][]; |
| } |
| |
| public char[] add(char[] name) { |
| int length = this.names.length; |
| int index = CharOperation.hashCode(name) % length; |
| char[] current; |
| while ((current = this.names[index]) != null) { |
| if (CharOperation.equals(current, name)) return current; |
| if (++index == length) index = 0; |
| } |
| this.names[index] = name; |
| |
| // assumes the threshold is never equal to the size of the table |
| if (++this.elementSize > this.threshold) rehash(); |
| return name; |
| } |
| |
| private void rehash() { |
| NameSet newSet = new NameSet(this.elementSize * 2); // double the number of expected elements |
| char[] current; |
| for (int i = this.names.length; --i >= 0;) |
| if ((current = this.names[i]) != null) |
| newSet.add(current); |
| |
| this.names = newSet.names; |
| this.elementSize = newSet.elementSize; |
| this.threshold = newSet.threshold; |
| } |
| |
| @Override |
| public String toString() { |
| String s = ""; //$NON-NLS-1$ |
| char[] name; |
| for (int i = 0, l = this.names.length; i < l; i++) |
| if ((name = this.names[i]) != null) |
| s += new String(name) + "\n"; //$NON-NLS-1$ |
| return s; |
| } |
| } |