| /* |
| * 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.builtin; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.StringTokenizer; |
| |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.PigException; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.data.BagFactory; |
| import org.apache.pig.data.DataBag; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.data.TupleFactory; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| import org.apache.pig.FuncSpec; |
| |
| /** |
| * Given a chararray as an argument, this method will split the chararray and |
| * return a bag with a tuple for each chararray that results from the split. |
| * The string is split on space, double quote, comma, open parend, close parend, |
| * and asterisk (star). |
| */ |
| public class TOKENIZE extends EvalFunc<DataBag> { |
| TupleFactory mTupleFactory = TupleFactory.getInstance(); |
| BagFactory mBagFactory = BagFactory.getInstance(); |
| |
| @Override |
| public DataBag exec(Tuple input) throws IOException { |
| try { |
| if (input==null) |
| return null; |
| if (input.size()==0) |
| return null; |
| Object o = input.get(0); |
| if (o==null) |
| return null; |
| DataBag output = mBagFactory.newDefaultBag(); |
| if (!(o instanceof String)) { |
| int errCode = 2114; |
| String msg = "Expected input to be chararray, but" + |
| " got " + o.getClass().getName(); |
| throw new ExecException(msg, errCode, PigException.BUG); |
| } |
| |
| String delim = " \",()*"; |
| if (input.size()==2) { |
| Object d = input.get(1); |
| if (!(d instanceof String)) { |
| int errCode = 2114; |
| String msg = "Expected delim to be chararray, but" + |
| " got " + d.getClass().getName(); |
| throw new ExecException(msg, errCode, PigException.BUG); |
| } |
| delim = (String)d; |
| } |
| |
| StringTokenizer tok = new StringTokenizer((String)o, delim, false); |
| while (tok.hasMoreTokens()) { |
| output.add(mTupleFactory.newTuple(tok.nextToken())); |
| } |
| return output; |
| } catch (ExecException ee) { |
| throw ee; |
| } |
| } |
| |
| @SuppressWarnings("deprecation") |
| @Override |
| public Schema outputSchema(Schema input) { |
| |
| try { |
| Schema.FieldSchema tokenFs = new Schema.FieldSchema("token", |
| DataType.CHARARRAY); |
| Schema tupleSchema = new Schema(tokenFs); |
| |
| Schema.FieldSchema tupleFs; |
| tupleFs = new Schema.FieldSchema("tuple_of_tokens", tupleSchema, |
| DataType.TUPLE); |
| |
| Schema bagSchema = new Schema(tupleFs); |
| bagSchema.setTwoLevelAccessRequired(true); |
| Schema.FieldSchema bagFs = new Schema.FieldSchema( |
| "bag_of_tokenTuples_from_" + input.getField(0).alias, bagSchema, DataType.BAG); |
| |
| return new Schema(bagFs); |
| |
| |
| |
| } catch (FrontendException e) { |
| // throwing RTE because |
| //above schema creation is not expected to throw an exception |
| // and also because superclass does not throw exception |
| throw new RuntimeException("Unable to compute TOKENIZE schema."); |
| } |
| } |
| |
| public List<FuncSpec> getArgToFuncMapping() throws FrontendException { |
| List<FuncSpec> funcList = new ArrayList<FuncSpec>(); |
| Schema s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| funcList.add(new FuncSpec(this.getClass().getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| s.add(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| funcList.add(new FuncSpec(this.getClass().getName(), s)); |
| return funcList; |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| }; |