java/pig-galago/src/com/yahoo/pig/impl/logicalLayer/LogicalPlanBuilder.java

   1 /*
   2  * Copyright (c) 2007 Yahoo! Inc.  All rights reserved.
   3  * See accompanying LICENSE file.
   4  */
   5 package com.yahoo.pig.impl.logicalLayer;
   6
   7 import java.io.ByteArrayInputStream;
   8 import java.io.IOException;
   9 import java.util.Map;
  10
  11 import com.yahoo.pig.impl.PigContext;
  12 import com.yahoo.pig.impl.logicalLayer.parser.ParseException;
  13 import com.yahoo.pig.impl.logicalLayer.parser.QueryParser;
  14 import com.yahoo.pig.impl.physicalLayer.IntermedResult;
  15
  16 /**
  17  * PlanBuilder class outputs a logical plan given a query String and set of ValidIDs
  18  *
  19  */
  20 public class LogicalPlanBuilder {
  21         public static ClassLoader classloader = LogicalPlanBuilder.class.getClassLoader();
  22         private PigContext pigContext;
  23     public LogicalPlanBuilder(PigContext pigContext) {
  24                 this.pigContext = pigContext;
  25         }
  26
  27         public LogicalPlan parse(String query, Map<String, IntermedResult> aliases)
  28                 throws IOException, ParseException {
  29                 ByteArrayInputStream in = new ByteArrayInputStream(query.getBytes());
  30                 QueryParser parser = new QueryParser(in, pigContext, aliases);
  31                 return parser.Parse();
  32         }
  33 }