| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.cassandra.utils; |
| |
| import java.io.*; |
| import java.nio.ByteBuffer; |
| import java.util.Random; |
| |
| public class KeyGenerator |
| { |
| private static ByteBuffer randomKey(Random r) { |
| byte[] bytes = new byte[48]; |
| r.nextBytes(bytes); |
| return ByteBuffer.wrap(bytes); |
| } |
| |
| static class RandomStringGenerator implements ResetableIterator<ByteBuffer> |
| { |
| int i, n, seed; |
| Random random; |
| |
| RandomStringGenerator(int seed, int n) { |
| i = 0; |
| this.seed = seed; |
| this.n = n; |
| reset(); |
| } |
| |
| public int size() { |
| return n; |
| } |
| |
| public void reset() { |
| random = new Random(seed); |
| } |
| |
| public boolean hasNext() { |
| return i < n; |
| } |
| |
| public ByteBuffer next() { |
| i++; |
| return randomKey(random); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| static class IntGenerator implements ResetableIterator<ByteBuffer> |
| { |
| private int i, start, n; |
| |
| IntGenerator(int n) { |
| this(0, n); |
| } |
| |
| IntGenerator(int start, int n) { |
| this.start = start; |
| this.n = n; |
| reset(); |
| } |
| |
| public int size() { |
| return n - start; |
| } |
| |
| public void reset() { |
| i = start; |
| } |
| |
| public boolean hasNext() { |
| return i < n; |
| } |
| |
| public ByteBuffer next() { |
| return ByteBufferUtil.bytes(Integer.toString(i++)); |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| static class WordGenerator implements ResetableIterator<ByteBuffer> |
| { |
| static int WORDS; |
| |
| static { |
| try { |
| BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream("/usr/share/dict/words"))); |
| while (br.ready()) { |
| br.readLine(); |
| WORDS++; |
| } |
| } catch (IOException e) { |
| WORDS = 0; |
| } |
| } |
| |
| BufferedReader reader; |
| private int modulo; |
| private int skip; |
| byte[] next; |
| |
| WordGenerator(int skip, int modulo) { |
| this.skip = skip; |
| this.modulo = modulo; |
| reset(); |
| } |
| |
| public int size() { |
| return (1 + WORDS - skip) / modulo; |
| } |
| |
| public void reset() { |
| try { |
| reader = new BufferedReader(new InputStreamReader(new FileInputStream("/usr/share/dict/words"))); |
| } catch (FileNotFoundException e) { |
| throw new RuntimeException(e); |
| } |
| for (int i = 0; i < skip; i++) { |
| try { |
| reader.readLine(); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| next(); |
| } |
| |
| public boolean hasNext() { |
| return next != null; |
| } |
| |
| public ByteBuffer next() { |
| try { |
| byte[] s = next; |
| for (int i = 0; i < modulo; i++) { |
| String line = reader.readLine(); |
| next = line == null ? null : line.getBytes(); |
| } |
| return s == null ? null : ByteBuffer.wrap(s); |
| } catch (IOException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| } |