-/*******************************************************************************
- * Copyright (c) 2000, 2004 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Common Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/cpl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
-package org.eclipse.jdt.internal.compiler.util;
-
-import org.eclipse.jdt.core.compiler.CharOperation;
-import org.eclipse.jdt.internal.compiler.lookup.PackageBinding;
-
-public final class HashtableOfPackage {
- // to avoid using Enumerations, walk the individual tables skipping nulls
- public char[] keyTable[];
- public PackageBinding valueTable[];
-
- public int elementSize; // number of elements in the table
- int threshold;
-public HashtableOfPackage() {
- this(3); // usually not very large
-}
-public HashtableOfPackage(int size) {
- this.elementSize = 0;
- this.threshold = size; // size represents the expected number of elements
- int extraRoom = (int) (size * 1.75f);
- if (this.threshold == extraRoom)
- extraRoom++;
- this.keyTable = new char[extraRoom][];
- this.valueTable = new PackageBinding[extraRoom];
-}
-public boolean containsKey(char[] key) {
- int index = CharOperation.hashCode(key) % valueTable.length;
- int keyLength = key.length;
- char[] currentKey;
- while ((currentKey = keyTable[index]) != null) {
- if (currentKey.length == keyLength && CharOperation.equals(currentKey, key))
- return true;
- index = (index + 1) % keyTable.length;
- }
- return false;
-}
-public PackageBinding get(char[] key) {
- int index = CharOperation.hashCode(key) % valueTable.length;
- int keyLength = key.length;
- char[] currentKey;
- while ((currentKey = keyTable[index]) != null) {
- if (currentKey.length == keyLength && CharOperation.equals(currentKey, key))
- return valueTable[index];
- index = (index + 1) % keyTable.length;
- }
- return null;
-}
-public PackageBinding put(char[] key, PackageBinding value) {
- int index = CharOperation.hashCode(key) % valueTable.length;
- int keyLength = key.length;
- char[] currentKey;
- while ((currentKey = keyTable[index]) != null) {
- if (currentKey.length == keyLength && CharOperation.equals(currentKey, key))
- return valueTable[index] = value;
- index = (index + 1) % keyTable.length;
- }
- keyTable[index] = key;
- valueTable[index] = value;
-
- // assumes the threshold is never equal to the size of the table
- if (++elementSize > threshold)
- rehash();
- return value;
-}
-private void rehash() {
- HashtableOfPackage newHashtable = new HashtableOfPackage(elementSize * 2); // double the number of expected elements
- char[] currentKey;
- for (int i = keyTable.length; --i >= 0;)
- if ((currentKey = keyTable[i]) != null)
- newHashtable.put(currentKey, valueTable[i]);
-
- this.keyTable = newHashtable.keyTable;
- this.valueTable = newHashtable.valueTable;
- this.threshold = newHashtable.threshold;
-}
-public int size() {
- return elementSize;
-}
-public String toString() {
- String s = ""; //$NON-NLS-1$
- PackageBinding pkg;
- for (int i = 0, length = valueTable.length; i < length; i++)
- if ((pkg = valueTable[i]) != null)
- s += pkg.toString() + "\n"; //$NON-NLS-1$
- return s;
-}
-}