| /* |
| * 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.newplan.logical.rules; |
| |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.logical.relational.LOLoad; |
| import org.apache.pig.newplan.logical.relational.LogicalPlan; |
| import org.apache.pig.newplan.logical.relational.LogicalRelationalOperator; |
| import org.apache.pig.newplan.logical.relational.LogicalSchema; |
| |
| public class LoadTypeCastInserter extends TypeCastInserter { |
| |
| public LoadTypeCastInserter(String n) { |
| super(n); |
| } |
| |
| @Override |
| protected OperatorPlan buildPattern() { |
| LogicalPlan plan = new LogicalPlan(); |
| plan.add(new LOLoad(null, plan)); |
| return plan; |
| } |
| |
| /** |
| * if we are inserting casts in a load and if the loader implements |
| * determineSchema(), insert casts only where necessary Note that in this |
| * case, the data coming out of the loader is not a BYTEARRAY but is |
| * whatever determineSchema() says it is. |
| */ |
| protected LogicalSchema determineSchema(LogicalRelationalOperator op) |
| throws FrontendException { |
| return ((LOLoad) op).getDeterminedSchema(); |
| } |
| |
| @Override |
| protected void markCastInserted(LogicalRelationalOperator op) { |
| ((LOLoad)op).setCastState(LOLoad.CastState.INSERTED); |
| } |
| |
| @Override |
| protected void markCastNoNeed(LogicalRelationalOperator op) { |
| ((LOLoad)op).setCastState(LOLoad.CastState.NONEED); |
| } |
| |
| @Override |
| protected boolean isCastAdjusted(LogicalRelationalOperator op) { |
| return ((LOLoad)op).isCastAdjusted(); |
| } |
| } |