| /* |
| * 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.pig.tools.grunt; |
| |
| import java.io.BufferedReader; |
| import java.io.FileInputStream; |
| import java.io.FileNotFoundException; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.InputStreamReader; |
| import java.net.URL; |
| import java.util.ArrayList; |
| import java.util.Enumeration; |
| import java.util.List; |
| import java.util.Set; |
| import java.util.TreeSet; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import jline.console.completer.Completer; |
| |
| public class PigCompletor implements Completer { |
| private final Log log = LogFactory.getLog(getClass()); |
| Set<String> candidates; |
| static final String AUTOCOMPLETE_FILENAME = "autocomplete"; |
| |
| public PigCompletor() { |
| candidates = new TreeSet<String>(); |
| try { |
| InputStream keywordStream; |
| |
| // try to find keyword file in current directory |
| keywordStream = null; |
| try |
| { |
| keywordStream = new FileInputStream(AUTOCOMPLETE_FILENAME); |
| PigCompletor.loadCandidateKeywords(keywordStream, candidates); |
| } |
| catch (FileNotFoundException e) |
| { |
| log.debug("Can not find autocomplete file in current directory, skipped"); |
| } |
| |
| // try to find all keyword file in CLASSPATH |
| Enumeration<URL> itr = getClass().getClassLoader().getResources(AUTOCOMPLETE_FILENAME); |
| while (itr.hasMoreElements()) |
| { |
| URL url = itr.nextElement(); |
| keywordStream = url.openStream(); |
| if (!PigCompletor.loadCandidateKeywords(keywordStream, candidates)) |
| log.debug("Error loading " + url + ", skipped"); |
| } |
| |
| // try to use default keyword file |
| keywordStream = getClass().getResourceAsStream("/org/apache/pig/tools/grunt/autocomplete"); |
| PigCompletor.loadCandidateKeywords(keywordStream, candidates); |
| } |
| catch (IOException e) { |
| log.warn("Error occurs when reading internal autocomplete file, skipped"); |
| } |
| } |
| |
| public static boolean loadCandidateKeywords(InputStream stream, Set<String> candidates) |
| throws IOException |
| { |
| if (stream==null) |
| return false; |
| |
| BufferedReader reader = new BufferedReader(new InputStreamReader(stream)); |
| String line; |
| while ((line=reader.readLine())!=null) |
| { |
| if (!line.startsWith("#")&&!line.startsWith("//")) |
| { |
| line = line.trim(); |
| if (!line.equals("")) |
| candidates.add(line); |
| } |
| |
| } |
| reader.close(); |
| stream.close(); |
| return true; |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public int complete(String buffer, int cursor, List candidates) { |
| if (cursor == 0) |
| return -1; |
| int p = cursor; |
| p--; |
| while (p > 0) { |
| char c = buffer.charAt(p); |
| if (isDelimit(c)) { |
| p++; |
| break; |
| } |
| p--; |
| } |
| StringBuffer sb = new StringBuffer(); |
| for (int i = p; i < cursor; i++) { |
| sb.append(buffer.charAt(i)); |
| } |
| if (!sb.toString().equals("")) { |
| List<String> matches = searchCandidate(sb.toString()); |
| if (matches != null) { |
| if(matches.size()==1) { |
| candidates.add(matches.get(0)+" "); |
| } |
| else { |
| for (String match:matches) |
| candidates.add(match); |
| } |
| return p; |
| } |
| } |
| return -1; |
| } |
| |
| private boolean isDelimit(char c) { |
| if (Character.isWhitespace(c)) |
| return true; |
| return false; |
| } |
| |
| private List<String> searchCandidate(String s) { |
| List<String> list = new ArrayList<String>(); |
| for (String can : candidates) { |
| if (can.startsWith(s)) |
| list.add(can); |
| } |
| return list; |
| } |
| } |