| /* |
| * 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.context.DynamicContext; |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.accessors.nodes.NodeTreePointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.exceptions.ErrorCode; |
| import org.apache.vxquery.exceptions.SystemException; |
| import org.apache.vxquery.types.SequenceType; |
| |
| import org.apache.hyracks.algebricks.runtime.base.IScalarEvaluator; |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.primitive.IntegerPointable; |
| import org.apache.hyracks.data.std.util.ArrayBackedValueStorage; |
| |
| public abstract class AbstractSinglePathStepScalarEvaluator extends AbstractPathStepScalarEvaluator { |
| protected final DynamicContext dCtx; |
| |
| private final IntegerPointable ip; |
| |
| private final SequencePointable seqa; |
| |
| private final SequencePointable seqp; |
| |
| private final ArrayBackedValueStorage seqAbvs; |
| |
| private final TaggedValuePointable itemTvp2; |
| |
| private boolean first; |
| |
| public AbstractSinglePathStepScalarEvaluator(IScalarEvaluator[] args, IHyracksTaskContext ctx) { |
| super(args, ctx); |
| dCtx = (DynamicContext) ctx.getJobletContext().getGlobalJobData(); |
| ip = (IntegerPointable) IntegerPointable.FACTORY.createPointable(); |
| seqa = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| seqp = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| seqAbvs = new ArrayBackedValueStorage(); |
| itemTvp2 = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| first = true; |
| } |
| |
| protected abstract void getSequence(NodeTreePointable ntp, SequencePointable seqp) throws SystemException; |
| |
| @Override |
| protected final void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException { |
| try { |
| if (first) { |
| if (args[1].getTag() != ValueTag.XS_INT_TAG) { |
| throw new IllegalArgumentException("Expected int value tag, got: " + args[1].getTag()); |
| } |
| args[1].getValue(ip); |
| int typeCode = ip.getInteger(); |
| SequenceType sType = dCtx.getStaticContext().lookupSequenceType(typeCode); |
| setNodeTest(sType); |
| first = false; |
| } |
| seqAbvs.reset(); |
| seqb.reset(seqAbvs); |
| if (args[0].getTag() == ValueTag.SEQUENCE_TAG) { |
| args[0].getValue(seqa); |
| int seqSize = seqa.getEntryCount(); |
| for (int index = 0; index < seqSize; ++index) { |
| seqa.getEntry(index, itemTvp2); |
| if (itemTvp2.getTag() != ValueTag.NODE_TREE_TAG) { |
| throw new SystemException(ErrorCode.SYSE0001); |
| } |
| itemTvp2.getValue(ntp); |
| processNodeTree(); |
| } |
| } else if (args[0].getTag() == ValueTag.NODE_TREE_TAG) { |
| args[0].getValue(ntp); |
| processNodeTree(); |
| } else { |
| throw new SystemException(ErrorCode.SYSE0001); |
| } |
| seqb.finish(); |
| result.set(seqAbvs); |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| |
| protected void processNodeTree() throws SystemException, IOException { |
| getSequence(ntp, seqp); |
| int seqSize = seqp.getEntryCount(); |
| for (int i = 0; i < seqSize; ++i) { |
| seqp.getEntry(i, itemTvp); |
| if (matches()) { |
| appendNodeToResult(); |
| } |
| } |
| } |
| } |