| /* |
| * 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.vxquery.runtime.functions.step; |
| |
| import java.io.IOException; |
| |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.accessors.nodes.DocumentNodePointable; |
| import org.apache.vxquery.datamodel.accessors.nodes.ElementNodePointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.exceptions.ErrorCode; |
| import org.apache.vxquery.exceptions.SystemException; |
| |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| import org.apache.hyracks.data.std.api.IPointable; |
| |
| public abstract class AbstractDescendantPathStepScalarEvaluator extends AbstractPathStepScalarEvaluator { |
| private final DocumentNodePointable dnp; |
| |
| private final ElementNodePointable enp; |
| |
| public AbstractDescendantPathStepScalarEvaluator(IScalarEvaluator[] args, IHyracksTaskContext ctx) { |
| super(args, ctx); |
| dnp = (DocumentNodePointable) DocumentNodePointable.FACTORY.createPointable(); |
| enp = (ElementNodePointable) ElementNodePointable.FACTORY.createPointable(); |
| } |
| |
| @Override |
| protected abstract void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException; |
| |
| /** |
| * Search through all tree children and children's children. |
| * |
| * @param nodePointable |
| * Node pointable |
| * @throws SystemException |
| * Could not save result. |
| */ |
| protected void searchSubtree(TaggedValuePointable nodePointable) throws SystemException { |
| try { |
| SequencePointable seqp = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| boolean search = false; |
| |
| // Find all child element to search. |
| switch (nodePointable.getTag()) { |
| case ValueTag.DOCUMENT_NODE_TAG: |
| nodePointable.getValue(dnp); |
| dnp.getContent(ntp, seqp); |
| search = true; |
| break; |
| |
| case ValueTag.ELEMENT_NODE_TAG: |
| nodePointable.getValue(enp); |
| if (enp.childrenChunkExists()) { |
| enp.getChildrenSequence(ntp, seqp); |
| search = true; |
| } |
| break; |
| } |
| |
| if (search) { |
| int seqSize = seqp.getEntryCount(); |
| for (int i = 0; i < seqSize; ++i) { |
| seqp.getEntry(i, itemTvp); |
| // Only search element nodes. |
| if (itemTvp.getTag() == ValueTag.ELEMENT_NODE_TAG) { |
| appendNodeToResult(); |
| // Now check this elements children. |
| TaggedValuePointable tvpTemp = (TaggedValuePointable) TaggedValuePointable.FACTORY |
| .createPointable(); |
| tvpTemp.set(itemTvp); |
| searchSubtree(tvpTemp); |
| } |
| } |
| } |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| |
| } |