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/* |
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* Copyright 2009 Google Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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|
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import java.util.Random; |
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import java.math.BigInteger; |
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|
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public enum ArrayBuilder { |
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|
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// These seven are from Tim's paper (listsort.txt) |
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|
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RANDOM_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = rnd.nextInt(); |
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return result; |
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} |
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}, |
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|
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DESCENDING_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = len - i; |
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return result; |
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} |
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}, |
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|
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ASCENDING_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = i; |
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return result; |
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} |
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}, |
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|
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ASCENDING_3_RND_EXCH_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = i; |
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for (int i = 0; i < 3; i++) |
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swap(result, rnd.nextInt(result.length), |
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rnd.nextInt(result.length)); |
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return result; |
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} |
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}, |
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|
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ASCENDING_10_RND_AT_END_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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int endStart = len - 10; |
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for (int i = 0; i < endStart; i++) |
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result[i] = i; |
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for (int i = endStart; i < len; i++) |
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result[i] = rnd.nextInt(endStart + 10); |
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return result; |
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} |
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}, |
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|
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ALL_EQUAL_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = 666; |
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return result; |
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} |
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}, |
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|
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DUPS_GALORE_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = rnd.nextInt(4); |
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return result; |
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} |
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}, |
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|
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RANDOM_WITH_DUPS_INT { |
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public Object[] build(int len) { |
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Integer[] result = new Integer[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = rnd.nextInt(len); |
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return result; |
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} |
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}, |
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|
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PSEUDO_ASCENDING_STRING { |
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public String[] build(int len) { |
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String[] result = new String[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = Integer.toString(i); |
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return result; |
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} |
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}, |
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|
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RANDOM_BIGINT { |
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public BigInteger[] build(int len) { |
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BigInteger[] result = new BigInteger[len]; |
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for (int i = 0; i < len; i++) |
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result[i] = HUGE.add(BigInteger.valueOf(rnd.nextInt(len))); |
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return result; |
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} |
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}; |
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|
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public abstract Object[] build(int len); |
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|
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public void resetRandom() { |
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rnd = new Random(666); |
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} |
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|
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private static Random rnd = new Random(666); |
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|
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private static void swap(Object[] a, int i, int j) { |
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Object t = a[i]; |
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a[i] = a[j]; |
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a[j] = t; |
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} |
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|
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private static BigInteger HUGE = BigInteger.ONE.shiftLeft(100); |
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} |
