| /******************************************************************************* |
| * Copyright (c) 2000, 2016 IBM Corporation and others. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0. |
| * |
| * SPDX-License-Identifier: EPL-2.0 |
| * |
| *******************************************************************************/ |
| package org.eclipse.dltk.compiler.util; |
| |
| /** |
| * Hashtable of {Object --> int[] } |
| */ |
| public final class HashtableOfObjectToIntArray implements Cloneable { |
| |
| // to avoid using Enumerations, walk the individual tables skipping nulls |
| public Object[] keyTable; |
| public int[][] valueTable; |
| |
| public int elementSize; // number of elements in the table |
| int threshold; |
| |
| public HashtableOfObjectToIntArray() { |
| this(13); |
| } |
| |
| public HashtableOfObjectToIntArray(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 Object[extraRoom]; |
| this.valueTable = new int[extraRoom][]; |
| } |
| |
| @Override |
| public Object clone() throws CloneNotSupportedException { |
| HashtableOfObjectToIntArray result = (HashtableOfObjectToIntArray) super.clone(); |
| result.elementSize = this.elementSize; |
| result.threshold = this.threshold; |
| |
| int length = this.keyTable.length; |
| result.keyTable = new Object[length]; |
| System.arraycopy(this.keyTable, 0, result.keyTable, 0, length); |
| |
| length = this.valueTable.length; |
| result.valueTable = new int[length][]; |
| System.arraycopy(this.valueTable, 0, result.valueTable, 0, length); |
| return result; |
| } |
| |
| public boolean containsKey(Object key) { |
| int length = this.keyTable.length, |
| index = (key.hashCode()& 0x7FFFFFFF) % length; |
| Object currentKey; |
| while ((currentKey = this.keyTable[index]) != null) { |
| if (currentKey.equals(key)) |
| return true; |
| if (++index == length) { |
| index = 0; |
| } |
| } |
| return false; |
| } |
| |
| public int[] get(Object key) { |
| int length = this.keyTable.length, |
| index = (key.hashCode()& 0x7FFFFFFF) % length; |
| Object currentKey; |
| while ((currentKey = this.keyTable[index]) != null) { |
| if (currentKey.equals(key)) |
| return this.valueTable[index]; |
| if (++index == length) { |
| index = 0; |
| } |
| } |
| return null; |
| } |
| |
| public void keysToArray(Object[] array) { |
| int index = 0; |
| for (int i=0, length=this.keyTable.length; i<length; i++) { |
| if (this.keyTable[i] != null) |
| array[index++] = this.keyTable[i]; |
| } |
| } |
| |
| public int[] put(Object key, int[] value) { |
| int length = this.keyTable.length, |
| index = (key.hashCode()& 0x7FFFFFFF) % length; |
| Object currentKey; |
| while ((currentKey = this.keyTable[index]) != null) { |
| if (currentKey.equals(key)) |
| return this.valueTable[index] = value; |
| if (++index == length) { |
| index = 0; |
| } |
| } |
| this.keyTable[index] = key; |
| this.valueTable[index] = value; |
| |
| // assumes the threshold is never equal to the size of the table |
| if (++elementSize > threshold) |
| rehash(); |
| return value; |
| } |
| |
| public int[] removeKey(Object key) { |
| int length = this.keyTable.length, |
| index = (key.hashCode()& 0x7FFFFFFF) % length; |
| Object currentKey; |
| while ((currentKey = this.keyTable[index]) != null) { |
| if (currentKey.equals(key)) { |
| int[] value = this.valueTable[index]; |
| elementSize--; |
| this.keyTable[index] = null; |
| rehash(); |
| return value; |
| } |
| if (++index == length) { |
| index = 0; |
| } |
| } |
| return null; |
| } |
| |
| private void rehash() { |
| |
| HashtableOfObjectToIntArray newHashtable = new HashtableOfObjectToIntArray(elementSize * 2); // double the number of expected elements |
| Object currentKey; |
| for (int i = this.keyTable.length; --i >= 0;) |
| if ((currentKey = this.keyTable[i]) != null) |
| newHashtable.put(currentKey, this.valueTable[i]); |
| |
| this.keyTable = newHashtable.keyTable; |
| this.valueTable = newHashtable.valueTable; |
| this.threshold = newHashtable.threshold; |
| } |
| |
| public int size() { |
| return elementSize; |
| } |
| |
| @Override |
| public String toString() { |
| String s = ""; //$NON-NLS-1$ |
| Object key; |
| for (int i = 0, length = this.keyTable.length; i < length; i++) |
| if ((key = this.keyTable[i]) != null) |
| s += key + " -> " + this.valueTable[i] + "\n"; //$NON-NLS-2$ //$NON-NLS-1$ |
| return s; |
| } |
| } |