| /* |
| * 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.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| 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 org.apache.pig.PigServer; |
| |
| import jline.Completor; |
| |
| public class PigCompletorAliases implements Completor { |
| private final Log log = LogFactory.getLog(getClass()); |
| Set<String> keywords; |
| PigServer pig; |
| |
| public PigCompletorAliases(PigServer server) |
| { |
| keywords = new TreeSet<String>(); |
| pig = server; |
| try { |
| InputStream keywordStream = getClass().getResourceAsStream("/org/apache/pig/tools/grunt/autocomplete_aliases"); |
| PigCompletor.loadCandidateKeywords(keywordStream, keywords); |
| } |
| catch (IOException e) { |
| log.warn("Error occurs when reading internal autocomplete_aliases file, skipped"); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| @Override |
| public int complete(String buffer, int cursor, List candidates) |
| { |
| if (cursor == 0) |
| return -1; |
| |
| String[] tokens = buffer.split("\\s+"); |
| if (tokens.length==0) |
| return -1; |
| if (keywords.contains(tokens[tokens.length-1])) { |
| for (String c : pig.getAliasKeySet()) { |
| candidates.add(c); |
| } |
| return cursor; |
| } |
| |
| if (tokens.length==1) |
| return -1; |
| |
| if (!keywords.contains(tokens[tokens.length-2])) |
| return -1; |
| |
| if (keywords.isEmpty()) { |
| return cursor; |
| } |
| |
| int p = cursor; |
| p--; |
| while (p > 0) { |
| char c = buffer.charAt(p); |
| if (Character.isWhitespace(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) { |
| candidates.addAll(matches); |
| return p; |
| } |
| } |
| return -1; |
| } |
| |
| private List<String> searchCandidate(String s) |
| { |
| List<String> list = new ArrayList<String>(); |
| for (String can : pig.getAliasKeySet()) { |
| if (can.startsWith(s) && !can.equals(s)) |
| list.add(can); |
| } |
| return list; |
| } |
| } |