| /* |
| * 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 org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.accessors.nodes.ElementNodePointable; |
| import org.apache.vxquery.datamodel.accessors.nodes.NodeTreePointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.datamodel.values.XDMConstants; |
| import org.apache.vxquery.exceptions.SystemException; |
| |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| |
| public class AttributePathStepScalarEvaluator extends AbstractSinglePathStepScalarEvaluator { |
| private final TaggedValuePointable rootTVP; |
| |
| private final ElementNodePointable enp; |
| |
| public AttributePathStepScalarEvaluator(IScalarEvaluator[] args, IHyracksTaskContext ctx) { |
| super(args, ctx); |
| rootTVP = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| enp = (ElementNodePointable) ElementNodePointable.FACTORY.createPointable(); |
| } |
| |
| @Override |
| protected void getSequence(NodeTreePointable ntp, SequencePointable seqp) throws SystemException { |
| ntp.getRootNode(rootTVP); |
| switch (rootTVP.getTag()) { |
| case ValueTag.ELEMENT_NODE_TAG: |
| rootTVP.getValue(enp); |
| if (enp.attributesChunkExists()) { |
| enp.getAttributeSequence(ntp, seqp); |
| return; |
| } |
| } |
| XDMConstants.setEmptySequence(seqp); |
| } |
| } |