| /* |
| * 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.Formatter; |
| |
| import org.apache.pig.EvalFunc; |
| import org.apache.pig.PigException; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| import org.apache.pig.backend.executionengine.ExecException; |
| |
| /** |
| * Formatted strings using java.util.Formatter |
| * |
| * See http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html |
| * |
| * ex: |
| * SPRINTF('%2$10s %1$-17s %2$,10d %2$8x %3$10.3f %4$1TFT%<tT%<tz', |
| * city, pop_2011, (float)(pop_2011/69.0f), (long)(pop_2011 * 1000000L)); |
| * |
| * -' 8244910 New York 8,244,910 7dceae 119491.453 2231-04-09T23:46:40-0500' |
| */ |
| public class SPRINTF extends EvalFunc<String> { |
| |
| @Override |
| public String exec(Tuple input) throws IOException { |
| StringBuilder sb = new StringBuilder(); |
| Formatter formatter = new Formatter(sb); |
| try{ |
| if (input == null || input.size() == 0) return null; |
| if (input.get(0) == null){ return null; } |
| |
| String fmt = String.valueOf(input.get(0)); |
| Object[] args = new Object[input.size()-1]; |
| for (int i = 1; i < input.size(); i++) { |
| args[i-1] = input.get(i); |
| if (args[i-1] == null){ return null; } |
| } |
| |
| formatter.format(fmt, args); |
| return sb.toString(); |
| } catch (ExecException exp) { |
| throw exp; |
| } catch (Exception err) { |
| int errCode = 2106; |
| String msg = "Error while computing string format in " + |
| this.getClass().getSimpleName() + " -- " + err.toString(); |
| throw new ExecException(msg, errCode, PigException.BUG, err); |
| } finally { |
| formatter.close(); |
| } |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| return new Schema(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| } |
| |
| @Override |
| public SchemaType getSchemaType() { |
| return SchemaType.VARARG; |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| } |