org.eclipse.jdt.internal.core.builder.NameSet Maven / Gradle / Ivy
The newest version!
/*******************************************************************************
* 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;
}
}