| /* |
| * 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.json; |
| |
| import java.io.IOException; |
| |
| import org.apache.hyracks.api.context.IHyracksTaskContext; |
| import org.apache.hyracks.data.std.api.IPointable; |
| import org.apache.hyracks.data.std.util.ArrayBackedValueStorage; |
| import org.apache.vxquery.datamodel.accessors.ArrayBackedValueStoragePool; |
| import org.apache.vxquery.datamodel.accessors.PointablePool; |
| import org.apache.vxquery.datamodel.accessors.SequencePointable; |
| import org.apache.vxquery.datamodel.accessors.TaggedValuePointable; |
| import org.apache.vxquery.datamodel.accessors.jsonitem.ArrayPointable; |
| import org.apache.vxquery.datamodel.accessors.jsonitem.ObjectPointable; |
| import org.apache.vxquery.datamodel.values.ValueTag; |
| import org.apache.vxquery.exceptions.ErrorCode; |
| import org.apache.vxquery.exceptions.SystemException; |
| import org.apache.vxquery.runtime.functions.step.AbstractForwardAxisPathStep; |
| |
| public class KeysOrMembersUnnesting extends AbstractForwardAxisPathStep { |
| private final ArrayPointable ap = (ArrayPointable) ArrayPointable.FACTORY.createPointable(); |
| private final SequencePointable sp = (SequencePointable) SequencePointable.FACTORY.createPointable(); |
| private final ObjectPointable op = (ObjectPointable) ObjectPointable.FACTORY.createPointable(); |
| private final TaggedValuePointable tvp = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| private final TaggedValuePointable tempTvp = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| private TaggedValuePointable arg = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| private final ArrayBackedValueStoragePool abvsPool = new ArrayBackedValueStoragePool(); |
| private ArrayBackedValueStorage abvs = new ArrayBackedValueStorage(); |
| private int arOrObArgsLength; |
| private int indexArrayArgs; |
| |
| public KeysOrMembersUnnesting(IHyracksTaskContext ctx, PointablePool pp) { |
| super(ctx, pp); |
| } |
| |
| protected void init(TaggedValuePointable[] args) throws SystemException { |
| abvs = abvsPool.takeOne(); |
| indexArrayArgs = 0; |
| arg = args[0]; |
| switch (arg.getTag()) { |
| case ValueTag.OBJECT_TAG: |
| arg.getValue(op); |
| arOrObArgsLength = op.getEntryCount(); |
| break; |
| case ValueTag.ARRAY_TAG: |
| arg.getValue(ap); |
| arOrObArgsLength = ap.getEntryCount(); |
| break; |
| default: |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| } |
| |
| public boolean step(IPointable result) throws SystemException { |
| abvs = abvsPool.takeOne(); |
| if (arOrObArgsLength > 0) { |
| while (indexArrayArgs < arOrObArgsLength) { |
| if (arg.getTag() == ValueTag.ARRAY_TAG) { |
| ap.getEntry(indexArrayArgs, tvp); |
| } else { |
| try { |
| op.getKeys(abvs); |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| tempTvp.set(abvs); |
| tempTvp.getValue(sp); |
| sp.getEntry(indexArrayArgs, tvp); |
| } |
| result.set(tvp.getByteArray(), tvp.getStartOffset(), tvp.getLength()); |
| indexArrayArgs++; |
| return true; |
| } |
| } |
| return false; |
| } |
| } |