| /* |
| * Copyright 2009-2013 by The Regents of the University of California |
| * Licensed 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 from |
| * |
| * 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 edu.uci.ics.hyracks.algebricks.core.algebra.operators.logical; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy; |
| |
| public abstract class AbstractScanOperator extends AbstractLogicalOperator { |
| protected List<LogicalVariable> variables; |
| |
| public AbstractScanOperator(List<LogicalVariable> variables) { |
| this.variables = variables; |
| } |
| |
| public List<LogicalVariable> getVariables() { |
| return variables; |
| } |
| |
| public void setVariables(List<LogicalVariable> variables) { |
| this.variables = variables; |
| } |
| |
| @Override |
| public void recomputeSchema() { |
| schema = new ArrayList<LogicalVariable>(); |
| schema.addAll(inputs.get(0).getValue().getSchema()); |
| schema.addAll(variables); |
| } |
| |
| @Override |
| public VariablePropagationPolicy getVariablePropagationPolicy() { |
| return new VariablePropagationPolicy() { |
| |
| @Override |
| public void propagateVariables(IOperatorSchema target, IOperatorSchema... sources) |
| throws AlgebricksException { |
| if (sources.length > 0) { |
| target.addAllVariables(sources[0]); |
| } |
| for (LogicalVariable v : variables) { |
| target.addVariable(v); |
| } |
| } |
| }; |
| } |
| |
| } |