| /* |
| * 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 org.apache.pig.EvalFunc; |
| import org.apache.pig.FuncSpec; |
| import org.apache.pig.PigException; |
| import org.apache.pig.backend.executionengine.ExecException; |
| import org.apache.pig.data.DataByteArray; |
| import org.apache.pig.data.DataType; |
| import org.apache.pig.data.Tuple; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.impl.logicalLayer.schema.Schema; |
| |
| |
| /** |
| * Generates the size of the argument passed to it. For bytearrays this |
| * means the number of bytes. For charrays the number of characters. For |
| * bags the number of tuples, for tuples the number of fields, and for maps |
| * the number of keyvalue pairs. For all other types the value of 1 is |
| * always returned. |
| */ |
| public class SIZE extends EvalFunc<Long> { |
| |
| @Override |
| public Long exec(Tuple input) throws IOException { |
| try { |
| DataByteArray dba = (DataByteArray)(input.get(0)); |
| return dba == null ? null : Long.valueOf(dba.size()); |
| } catch (ExecException exp) { |
| throw exp; |
| } catch (Exception e) { |
| int errCode = 2106; |
| String msg = "Error while computing size in " + this.getClass().getSimpleName(); |
| throw new ExecException(msg, errCode, PigException.BUG, e); |
| } |
| } |
| |
| @Override |
| public Schema outputSchema(Schema input) { |
| return new Schema(new Schema.FieldSchema(null, DataType.LONG)); |
| } |
| |
| /* (non-Javadoc) |
| * @see org.apache.pig.EvalFunc#getArgToFuncMapping() |
| */ |
| @Override |
| public List<FuncSpec> getArgToFuncMapping() throws FrontendException { |
| List<FuncSpec> funcList = new ArrayList<FuncSpec>(); |
| Schema s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.BYTEARRAY)); |
| funcList.add(new FuncSpec(this.getClass().getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.CHARARRAY)); |
| funcList.add(new FuncSpec(StringSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.TUPLE)); |
| funcList.add(new FuncSpec(TupleSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.BAG)); |
| funcList.add(new FuncSpec(BagSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.MAP)); |
| funcList.add(new FuncSpec(MapSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.INTEGER)); |
| funcList.add(new FuncSpec(ConstantSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.LONG)); |
| funcList.add(new FuncSpec(ConstantSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.FLOAT)); |
| funcList.add(new FuncSpec(ConstantSize.class.getName(), s)); |
| s = new Schema(); |
| s.add(new Schema.FieldSchema(null, DataType.DOUBLE)); |
| funcList.add(new FuncSpec(ConstantSize.class.getName(), s)); |
| return funcList; |
| } |
| |
| @Override |
| public boolean allowCompileTimeCalculation() { |
| return true; |
| } |
| } |