| /* |
| * Copyright 2009-2010 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 edu.uci.ics.hyracks.algebricks.common.exceptions.AlgebricksException; |
| import edu.uci.ics.hyracks.algebricks.common.utils.Pair; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalOperatorTag; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.expressions.IVariableTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.properties.VariablePropagationPolicy; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.scripting.IScriptDescription; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.typing.NonPropagatingTypeEnvironment; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalExpressionReferenceTransform; |
| import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor; |
| |
| public class ScriptOperator extends AbstractLogicalOperator { |
| |
| private ArrayList<LogicalVariable> inputVariables; |
| private ArrayList<LogicalVariable> outputVariables; |
| private IScriptDescription scriptDesc; |
| |
| public ScriptOperator(IScriptDescription scriptDesc, ArrayList<LogicalVariable> inputVariables, |
| ArrayList<LogicalVariable> outputVariables) { |
| this.inputVariables = inputVariables; |
| this.outputVariables = outputVariables; |
| this.scriptDesc = scriptDesc; |
| } |
| |
| public ArrayList<LogicalVariable> getInputVariables() { |
| return inputVariables; |
| } |
| |
| public ArrayList<LogicalVariable> getOutputVariables() { |
| return outputVariables; |
| } |
| |
| public IScriptDescription getScriptDescription() { |
| return scriptDesc; |
| } |
| |
| @Override |
| public LogicalOperatorTag getOperatorTag() { |
| return LogicalOperatorTag.SCRIPT; |
| } |
| |
| @Override |
| public <R, T> R accept(ILogicalOperatorVisitor<R, T> visitor, T arg) throws AlgebricksException { |
| return visitor.visitScriptOperator(this, arg); |
| } |
| |
| @Override |
| public boolean acceptExpressionTransform(ILogicalExpressionReferenceTransform visitor) throws AlgebricksException { |
| return false; |
| } |
| |
| @Override |
| public VariablePropagationPolicy getVariablePropagationPolicy() { |
| return new VariablePropagationPolicy() { |
| |
| @Override |
| public void propagateVariables(IOperatorSchema target, IOperatorSchema... sources) |
| throws AlgebricksException { |
| for (LogicalVariable v : outputVariables) { |
| target.addVariable(v); |
| } |
| } |
| }; |
| |
| } |
| |
| @Override |
| public boolean isMap() { |
| return false; |
| } |
| |
| @Override |
| public void recomputeSchema() { |
| this.schema = outputVariables; |
| } |
| |
| @Override |
| public IVariableTypeEnvironment computeOutputTypeEnvironment(ITypingContext ctx) throws AlgebricksException { |
| IVariableTypeEnvironment env = new NonPropagatingTypeEnvironment(ctx.getExpressionTypeComputer(), |
| ctx.getMetadataProvider()); |
| for (Pair<LogicalVariable, Object> p : scriptDesc.getVarTypePairs()) { |
| env.setVarType(p.first, p.second); |
| } |
| return env; |
| } |
| |
| } |