| /* |
| * 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.expression; |
| |
| import org.apache.pig.FuncSpec; |
| import org.apache.pig.impl.logicalLayer.FrontendException; |
| import org.apache.pig.newplan.Operator; |
| import org.apache.pig.newplan.OperatorPlan; |
| import org.apache.pig.newplan.PlanVisitor; |
| import org.apache.pig.newplan.logical.relational.LogicalSchema; |
| import org.apache.pig.parser.SourceLocation; |
| |
| public class CastExpression extends UnaryExpression { |
| private FuncSpec castFunc; |
| private LogicalSchema.LogicalFieldSchema castSchema; |
| |
| public CastExpression(OperatorPlan plan, LogicalExpression exp, LogicalSchema.LogicalFieldSchema fs) { |
| super("Cast", plan, exp); |
| castSchema = fs.deepCopy(); |
| castSchema.resetUid(); |
| } |
| |
| @Override |
| public void accept(PlanVisitor v) throws FrontendException { |
| if (!(v instanceof LogicalExpressionVisitor)) { |
| throw new FrontendException("Expected LogicalExpressionVisitor", 2222); |
| } |
| ((LogicalExpressionVisitor)v).visit(this); |
| } |
| |
| /** |
| * Set the <code>FuncSpec</code> that performs the casting functionality |
| * @param spec the <code>FuncSpec</code> that does the casting |
| */ |
| public void setFuncSpec(FuncSpec spec) { |
| castFunc = spec; |
| } |
| |
| /** |
| * Get the <code>FuncSpec</code> that performs the casting functionality |
| * @return the <code>FuncSpec</code> that does the casting |
| */ |
| public FuncSpec getFuncSpec() { |
| return castFunc; |
| } |
| |
| @Override |
| public boolean isEqual(Operator other) throws FrontendException { |
| if (other != null && other instanceof CastExpression) { |
| CastExpression of = (CastExpression)other; |
| return getExpression().isEqual( of.getExpression() ); |
| } else { |
| return false; |
| } |
| } |
| |
| @Override |
| public LogicalSchema.LogicalFieldSchema getFieldSchema() throws FrontendException { |
| if (fieldSchema!=null) |
| return fieldSchema; |
| fieldSchema = new LogicalSchema.LogicalFieldSchema(null, castSchema.schema, castSchema.type); |
| uidOnlyFieldSchema = fieldSchema.mergeUid(uidOnlyFieldSchema); |
| // Bring back the top level uid, this is not changed |
| LogicalExpression exp = (LogicalExpression)plan.getSuccessors(this).get(0); |
| if (exp.getFieldSchema()!=null) { |
| fieldSchema.uid = exp.getFieldSchema().uid; |
| fieldSchema.alias = exp.getFieldSchema().alias; |
| } |
| return fieldSchema; |
| } |
| |
| @Override |
| public LogicalExpression deepCopy(LogicalExpressionPlan lgExpPlan) throws FrontendException { |
| LogicalExpression copy = new CastExpression( |
| lgExpPlan, |
| this.getExpression().deepCopy(lgExpPlan), |
| castSchema.deepCopy()); |
| try { |
| FuncSpec origFuncSpec = this.getFuncSpec(); |
| if (origFuncSpec != null ) { |
| ((CastExpression)copy).setFuncSpec(origFuncSpec.clone()); |
| } |
| } catch(CloneNotSupportedException e) { |
| e.printStackTrace(); |
| } |
| copy.setLocation( new SourceLocation( location ) ); |
| return copy; |
| } |
| |
| } |