| /* |
| * 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.visitors;
|
|
|
| import java.util.Collection;
|
| import java.util.HashSet;
|
| import java.util.List;
|
| import java.util.Set;
|
|
|
| import org.apache.commons.lang3.mutable.Mutable;
|
|
|
| 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.ILogicalOperator;
|
| import edu.uci.ics.hyracks.algebricks.core.algebra.base.LogicalVariable;
|
| import edu.uci.ics.hyracks.algebricks.core.algebra.typing.ITypingContext;
|
| import edu.uci.ics.hyracks.algebricks.core.algebra.visitors.ILogicalOperatorVisitor;
|
|
|
| public class VariableUtilities {
|
|
|
| public static void getUsedVariables(ILogicalOperator op, Collection<LogicalVariable> usedVariables)
|
| throws AlgebricksException {
|
| ILogicalOperatorVisitor<Void, Void> visitor = new UsedVariableVisitor(usedVariables);
|
| op.accept(visitor, null);
|
| }
|
|
|
| public static void getProducedVariables(ILogicalOperator op, Collection<LogicalVariable> producedVariables)
|
| throws AlgebricksException {
|
| ILogicalOperatorVisitor<Void, Void> visitor = new ProducedVariableVisitor(producedVariables);
|
| op.accept(visitor, null);
|
| }
|
|
|
| public static void getLiveVariables(ILogicalOperator op, Collection<LogicalVariable> schemaVariables)
|
| throws AlgebricksException {
|
| ILogicalOperatorVisitor<Void, Void> visitor = new SchemaVariableVisitor(schemaVariables);
|
| op.accept(visitor, null);
|
| }
|
|
|
| public static void getUsedVariablesInDescendantsAndSelf(ILogicalOperator op, Collection<LogicalVariable> vars)
|
| throws AlgebricksException {
|
| // DFS traversal
|
| VariableUtilities.getUsedVariables(op, vars);
|
| for (Mutable<ILogicalOperator> c : op.getInputs()) {
|
| getUsedVariablesInDescendantsAndSelf(c.getValue(), vars);
|
| }
|
| }
|
|
|
| public static void substituteVariables(ILogicalOperator op, LogicalVariable v1, LogicalVariable v2,
|
| ITypingContext ctx) throws AlgebricksException {
|
| substituteVariables(op, v1, v2, true, ctx);
|
| }
|
|
|
| public static void substituteVariablesInDescendantsAndSelf(ILogicalOperator op, LogicalVariable v1,
|
| LogicalVariable v2, ITypingContext ctx) throws AlgebricksException {
|
| for (Mutable<ILogicalOperator> childOp : op.getInputs()) {
|
| substituteVariablesInDescendantsAndSelf(childOp.getValue(), v1, v2, ctx);
|
| }
|
| substituteVariables(op, v1, v2, true, ctx);
|
| }
|
|
|
| public static void substituteVariables(ILogicalOperator op, LogicalVariable v1, LogicalVariable v2,
|
| boolean goThroughNts, ITypingContext ctx) throws AlgebricksException {
|
| ILogicalOperatorVisitor<Void, Pair<LogicalVariable, LogicalVariable>> visitor = new SubstituteVariableVisitor(
|
| goThroughNts, ctx);
|
| op.accept(visitor, new Pair<LogicalVariable, LogicalVariable>(v1, v2));
|
| }
|
|
|
| public static <T> boolean varListEqualUnordered(List<T> var, List<T> varArg) {
|
| Set<T> varSet = new HashSet<T>();
|
| Set<T> varArgSet = new HashSet<T>();
|
| varSet.addAll(var);
|
| varArgSet.addAll(varArg);
|
| return varSet.equals(varArgSet);
|
| }
|
|
|
| }
|