| /* |
| * 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; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.Iterator; |
| import java.util.Properties; |
| |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| import org.apache.pig.PigServer.ExecType; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.impl.logicalLayer.LogicalPlan; |
| |
| public class StandAloneParser { |
| |
| private static final Log log = LogFactory.getLog(StandAloneParser.class); |
| |
| static PigServer pig; |
| |
| public static void main(String args[]) throws IOException, ExecException { |
| |
| BufferedReader in = new BufferedReader(new InputStreamReader(System.in)); |
| pig = new PigServer(ExecType.LOCAL, new Properties()); |
| |
| while (true) { |
| System.out.print("> "); |
| |
| String line; |
| try { |
| line = in.readLine(); |
| } catch (IOException e) { |
| log.error(e); |
| return; |
| } |
| |
| if (line.toLowerCase().equals("quit")) break; |
| if (line.toLowerCase().startsWith("#")) continue; |
| else tryParse(line); |
| |
| } |
| } |
| |
| private static void tryParse(String query) { |
| if (query.trim().equals("")) |
| return; |
| try{ |
| pig.registerQuery(query); |
| System.out.print("Current aliases: "); |
| for (Iterator<String> it = pig.getAliases().keySet().iterator(); it.hasNext(); ) { |
| String alias = it.next(); |
| LogicalPlan lp = pig.getAliases().get(alias); |
| System.out.print(alias + "->" + lp.getOpTable().get(lp.getRoot()).outputSchema()); |
| if (it.hasNext()) System.out.print(", \n"); |
| else System.out.print("\n"); |
| } |
| } catch (IOException e) { |
| log.error(e); |
| } |
| } |
| } |