| /** |
| * 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.hadoop.tools.rumen.anonymization; |
| |
| |
| import org.apache.commons.lang3.StringUtils; |
| |
| /** |
| * Utility class to handle commonly performed tasks in a |
| * {@link org.apache.hadoop.tools.rumen.datatypes.DefaultAnonymizableDataType} |
| * using a {@link WordList} for anonymization. |
| * //TODO There is no caching for saving memory. |
| */ |
| public class WordListAnonymizerUtility { |
| static final String[] KNOWN_WORDS = |
| new String[] {"job", "tmp", "temp", "home", "homes", "usr", "user", "test"}; |
| |
| /** |
| * Checks if the data needs anonymization. Typically, data types which are |
| * numeric in nature doesn't need anonymization. |
| */ |
| public static boolean needsAnonymization(String data) { |
| // Numeric data doesn't need anonymization |
| // Currently this doesnt support inputs like |
| // - 12.3 |
| // - 12.3f |
| // - 90L |
| // - 1D |
| if (StringUtils.isNumeric(data)) { |
| return false; |
| } |
| return true; // by default return true |
| } |
| |
| /** |
| * Checks if the given data has a known suffix. |
| */ |
| public static boolean hasSuffix(String data, String[] suffixes) { |
| // check if they end in known suffixes |
| for (String ks : suffixes) { |
| if (data.endsWith(ks)) { |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Extracts a known suffix from the given data. |
| * |
| * @throws RuntimeException if the data doesn't have a suffix. |
| * Use {@link #hasSuffix(String, String[])} to make sure that the |
| * given data has a suffix. |
| */ |
| public static String[] extractSuffix(String data, String[] suffixes) { |
| // check if they end in known suffixes |
| String suffix = ""; |
| for (String ks : suffixes) { |
| if (data.endsWith(ks)) { |
| suffix = ks; |
| // stripe off the suffix which will get appended later |
| data = data.substring(0, data.length() - suffix.length()); |
| return new String[] {data, suffix}; |
| } |
| } |
| |
| // throw exception |
| throw new RuntimeException("Data [" + data + "] doesn't have a suffix from" |
| + " known suffixes [" + StringUtils.join(suffixes, ',') + "]"); |
| } |
| |
| /** |
| * Checks if the given data is known. This API uses {@link #KNOWN_WORDS} to |
| * detect if the given data is a commonly used (so called 'known') word. |
| */ |
| public static boolean isKnownData(String data) { |
| return isKnownData(data, KNOWN_WORDS); |
| } |
| |
| /** |
| * Checks if the given data is known. |
| */ |
| public static boolean isKnownData(String data, String[] knownWords) { |
| // check if the data is known content |
| //TODO [Chunking] Do this for sub-strings of data |
| |
| for (String kd : knownWords) { |
| if (data.equals(kd)) { |
| return true; |
| } |
| } |
| return false; |
| } |
| } |