| /* |
| * Copyright (C) 2009, Christian Halstrick <christian.halstrick@sap.com> |
| * and other copyright owners as documented in the project's IP log. |
| * |
| * This program and the accompanying materials are made available |
| * under the terms of the Eclipse Distribution License v1.0 which |
| * accompanies this distribution, is reproduced below, and is |
| * available at http://www.eclipse.org/org/documents/edl-v10.php |
| * |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or |
| * without modification, are permitted provided that the following |
| * conditions are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * - Neither the name of the Eclipse Foundation, Inc. nor the |
| * names of its contributors may be used to endorse or promote |
| * products derived from this software without specific prior |
| * written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND |
| * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, |
| * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF |
| * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.eclipse.jgit.diff; |
| |
| public class DiffTestDataGenerator { |
| /** |
| * Generate sequence of characters in ascending order. The first character |
| * is a space. All subsequent characters have an ASCII code one greater then |
| * the ASCII code of the preceding character. On exception: the character |
| * following which follows '~' is again a ' '. |
| * |
| * @param len |
| * length of the String to be returned |
| * @return the sequence of characters as String |
| */ |
| public static String generateSequence(int len) { |
| return generateSequence(len, 0, 0); |
| } |
| |
| /** |
| * Generate sequence of characters similar to the one returned by |
| * {@link #generateSequence(int)}. But this time in each chunk of |
| * <skipPeriod> characters the last <skipLength> characters are left out. By |
| * calling this method twice with two different prime skipPeriod values and |
| * short skipLength values you create test data which is similar to what |
| * programmers do to their source code - huge files with only few |
| * insertions/deletions/changes. |
| * |
| * @param len |
| * length of the String to be returned |
| * @param skipPeriod |
| * @param skipLength |
| * @return the sequence of characters as String |
| */ |
| public static String generateSequence(int len, int skipPeriod, |
| int skipLength) { |
| StringBuilder text = new StringBuilder(len); |
| int skipStart = skipPeriod - skipLength; |
| int skippedChars = 0; |
| for (int i = 0; i - skippedChars < len; ++i) { |
| if (skipPeriod == 0 || i % skipPeriod < skipStart) { |
| text.append((char) (32 + i % 95)); |
| } else { |
| skippedChars++; |
| } |
| } |
| return text.toString(); |
| } |
| } |