| package org.apache.rya.indexing.IndexPlanValidator; |
| |
| /* |
| * 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. |
| */ |
| |
| import java.util.Iterator; |
| import java.util.NoSuchElementException; |
| import java.util.Set; |
| |
| import org.apache.rya.indexing.external.tupleSet.ExternalTupleSet; |
| import org.eclipse.rdf4j.query.algebra.BindingSetAssignment; |
| import org.eclipse.rdf4j.query.algebra.Filter; |
| import org.eclipse.rdf4j.query.algebra.Join; |
| import org.eclipse.rdf4j.query.algebra.Projection; |
| import org.eclipse.rdf4j.query.algebra.StatementPattern; |
| import org.eclipse.rdf4j.query.algebra.TupleExpr; |
| import org.eclipse.rdf4j.query.algebra.helpers.AbstractQueryModelVisitor; |
| |
| import com.google.common.collect.Sets; |
| |
| |
| |
| |
| public class IndexPlanValidator implements TupleValidator { |
| |
| private boolean omitCrossProd = false; |
| |
| |
| public IndexPlanValidator(boolean omitCrossProd) { |
| this.omitCrossProd = omitCrossProd; |
| } |
| |
| public void setOmitCrossProd(boolean omitCrossProd) { |
| this.omitCrossProd = omitCrossProd; |
| } |
| |
| |
| @Override |
| public boolean isValid(TupleExpr te) { |
| |
| TupleValidateVisitor tv = new TupleValidateVisitor(); |
| te.visit(tv); |
| |
| return tv.isValid(); |
| } |
| |
| |
| |
| |
| public int getValidTupleSize(Iterator<TupleExpr> iter) { |
| |
| int size = 0; |
| |
| while(iter.hasNext()) { |
| if(isValid(iter.next())) { |
| size++; |
| } |
| } |
| |
| return size; |
| |
| } |
| |
| |
| |
| @Override |
| public Iterator<TupleExpr> getValidTuples(Iterator<TupleExpr> tupleIter) { |
| |
| final Iterator<TupleExpr> iter = tupleIter; |
| |
| return new Iterator<TupleExpr>() { |
| |
| private TupleExpr next = null; |
| private boolean hasNextCalled = false; |
| private boolean isEmpty = false; |
| |
| @Override |
| public boolean hasNext() { |
| |
| if (!hasNextCalled && !isEmpty) { |
| while (iter.hasNext()) { |
| TupleExpr temp = iter.next(); |
| if (isValid(temp)) { |
| next = temp; |
| hasNextCalled = true; |
| return true; |
| } |
| } |
| isEmpty = true; |
| return false; |
| } else { |
| return !isEmpty; |
| } |
| } |
| |
| @Override |
| public TupleExpr next() { |
| |
| if (hasNextCalled) { |
| hasNextCalled = false; |
| return next; |
| } else if(isEmpty) { |
| throw new NoSuchElementException(); |
| }else { |
| if (this.hasNext()) { |
| hasNextCalled = false; |
| return next; |
| } else { |
| throw new NoSuchElementException(); |
| } |
| } |
| } |
| |
| @Override |
| public void remove() { |
| |
| throw new UnsupportedOperationException("Cannot delete from iterator!"); |
| |
| } |
| |
| }; |
| } |
| |
| private boolean isJoinValid(Join join) { |
| |
| Set<String> leftBindingNames = join.getLeftArg().getBindingNames(); |
| Set<String> rightBindingNames = join.getRightArg().getBindingNames(); |
| |
| |
| //System.out.println("Left binding names are " + leftBindingNames + " and right binding names are " + rightBindingNames); |
| |
| if (Sets.intersection(leftBindingNames, rightBindingNames).size() == 0) { |
| return !omitCrossProd; |
| } else { |
| if (join.getRightArg() instanceof ExternalTupleSet) { |
| return ((ExternalTupleSet) join.getRightArg()).supportsBindingSet(leftBindingNames); |
| } else { |
| return true; |
| } |
| } |
| |
| } |
| |
| public class TupleValidateVisitor extends AbstractQueryModelVisitor<RuntimeException> { |
| |
| private boolean isValid = true; |
| |
| public boolean isValid() { |
| return isValid; |
| } |
| |
| @Override |
| public void meet(Projection node) { |
| node.getArg().visit(this); |
| } |
| |
| @Override |
| public void meet(StatementPattern node) { |
| return; |
| } |
| |
| public void meet(BindingSetAssignment node) { |
| return; |
| } |
| |
| @Override |
| public void meet(Filter node) { |
| node.getArg().visit(this); |
| } |
| |
| @Override |
| public void meet(Join node) { |
| if (isJoinValid(node)) { |
| super.meet(node); |
| } else { |
| isValid = false; |
| return; |
| } |
| } |
| |
| } |
| |
| } |