| /* |
| * 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. |
| * |
| */ |
| |
| /* $Id: Grep.java 152682 2005-02-08 18:13:39Z gregor $ */ |
| |
| package org.apache.lenya.search; |
| |
| import java.io.File; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.nio.CharBuffer; |
| import java.nio.MappedByteBuffer; |
| import java.nio.channels.FileChannel; |
| import java.nio.charset.CharacterCodingException; |
| import java.nio.charset.Charset; |
| import java.nio.charset.CharsetDecoder; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| import org.apache.avalon.framework.logger.ConsoleLogger; |
| import org.apache.avalon.framework.logger.Logger; |
| |
| /** |
| * Utility class to provide a subset of the grep functionality. |
| */ |
| public class Grep { |
| |
| private static Charset charset = Charset.forName("UTF-8"); |
| private static CharsetDecoder decoder = charset.newDecoder(); |
| |
| /** |
| * Check if the given file contains the pattern |
| * @param file the file which is to be searched for the pattern |
| * @param pattern the pattern that is being searched. |
| * @return true if the file contains the string, false otherwise. |
| * @throws IOException |
| */ |
| public static boolean containsPattern(File file, Pattern pattern) throws IOException { |
| |
| Logger log = new ConsoleLogger(); |
| |
| FileChannel fc = null; |
| // Open the file and then get a channel from the stream |
| FileInputStream fis = null; |
| boolean result = false; |
| |
| try { |
| fis = new FileInputStream(file); |
| fc = fis.getChannel(); |
| |
| // Get the file's size and then map it into memory |
| int sz = (int)fc.size(); |
| MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz); |
| |
| // Decode the file into a char buffer |
| CharBuffer cb = decoder.decode(bb); |
| |
| // Perform the search |
| Matcher pm = pattern.matcher(cb); // Pattern matcher |
| |
| result = pm.find(); |
| } catch (FileNotFoundException e) { |
| log.error("File not found: " +e.toString()); |
| } catch (CharacterCodingException e) { |
| log.error("Problem with encoding: " +e.toString()); |
| } catch (IOException e) { |
| log.error("IO Exception: " +e.toString()); |
| } finally { |
| // Close the channel and the stream |
| if (fc != null) |
| fc.close(); |
| if (fis != null) |
| fis.close(); |
| } |
| return result; |
| } |
| |
| /** |
| * Find all occurences of pattern in a file. |
| * @param file the file to search for occurences of pattern |
| * @param pattern the pattern to search for |
| * @param group which group in the pattern to return |
| * @return an <code>array</code> of occurences of pattern |
| * (i.e. the groupth group of the match) |
| * @throws IOException if the file could not be read. |
| */ |
| public static String[] findPattern(File file, Pattern pattern, int group) throws IOException { |
| |
| Logger log = new ConsoleLogger(); |
| |
| ArrayList occurences = new ArrayList(); |
| FileInputStream fis = null; |
| FileChannel fc = null; |
| |
| try { |
| // Open the file and then get a channel from the stream |
| fis = new FileInputStream(file); |
| fc = fis.getChannel(); |
| |
| // Get the file's size and then map it into memory |
| int sz = (int)fc.size(); |
| MappedByteBuffer bb = fc.map(FileChannel.MapMode.READ_ONLY, 0, sz); |
| |
| // Decode the file into a char buffer |
| CharBuffer cb = decoder.decode(bb); |
| |
| // Perform the search |
| Matcher pm = pattern.matcher(cb); // Pattern matcher |
| |
| while (pm.find()) { |
| occurences.add(pm.group(group)); |
| } |
| } catch (FileNotFoundException e) { |
| log.error("file not found " +e.toString()); |
| } catch (CharacterCodingException e) { |
| log.error("encoding problem " +e.toString()); |
| } catch (IOException e) { |
| log.error("IO exception" +e.toString()); |
| } finally { |
| // Close the channel and the stream |
| if (fc != null) |
| fc.close(); |
| if (fis != null) |
| fis.close(); |
| } |
| return (String[])occurences.toArray(new String[occurences.size()]); |
| |
| } |
| |
| /** |
| * Find all files below the given file which contain the given pattern. |
| * @param file the file where to start the search for the pattern. |
| * @param pattern the pattern to search for. |
| * @return an array of files which contain the pattern |
| * @throws IOException if any of the files could not be opened. |
| */ |
| private static List find_internal(File file, Pattern pattern) throws IOException { |
| ArrayList fileList = new ArrayList(); |
| |
| if (file.isDirectory()) { |
| String[] children = file.list(); |
| for (int i = 0; i < children.length; i++) { |
| fileList.addAll( |
| find_internal( |
| new File(file.getAbsolutePath(), children[i]), |
| pattern)); |
| } |
| } else if (file.isFile() && containsPattern(file, pattern)) { |
| fileList.add(file); |
| } |
| return fileList; |
| } |
| |
| /** |
| * Find all files below the given file which contain the given search string. |
| * |
| * @param file the where to start the search |
| * @param searchString the string to search for. |
| * |
| * @return an array of files which contain the search string. |
| * |
| * @throws IOException if any of the files could not be opened. |
| */ |
| public static File[] find(File file, String searchString) throws IOException { |
| Pattern pattern = Pattern.compile(searchString); |
| List fileList = find_internal(file, pattern); |
| return (File[])fileList.toArray(new File[fileList.size()]); |
| } |
| } |