| /* |
| * 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.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.util.ArrayBackedValueStorage; |
| 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.builders.sequence.SequenceBuilder; |
| 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.base.AbstractTaggedValueArgumentScalarEvaluator; |
| |
| public class KeysOrMembersScalarEvaluator extends AbstractTaggedValueArgumentScalarEvaluator { |
| protected final IHyracksTaskContext ctx; |
| private final ObjectPointable op; |
| private final ArrayPointable ap; |
| private final ArrayBackedValueStorage abvs; |
| private final SequenceBuilder sb; |
| private final TaggedValuePointable tempTvp; |
| |
| public KeysOrMembersScalarEvaluator(IHyracksTaskContext ctx, IScalarEvaluator[] args) { |
| super(args); |
| this.ctx = ctx; |
| op = (ObjectPointable) ObjectPointable.FACTORY.createPointable(); |
| ap = (ArrayPointable) ArrayPointable.FACTORY.createPointable(); |
| abvs = new ArrayBackedValueStorage(); |
| sb = new SequenceBuilder(); |
| tempTvp = (TaggedValuePointable) TaggedValuePointable.FACTORY.createPointable(); |
| } |
| |
| @Override |
| protected void evaluate(TaggedValuePointable[] args, IPointable result) throws SystemException { |
| final TaggedValuePointable tvp = args[0]; |
| try { |
| switch (tvp.getTag()) { |
| case ValueTag.OBJECT_TAG: |
| tvp.getValue(op); |
| op.getKeys(result); |
| break; |
| case ValueTag.ARRAY_TAG: |
| abvs.reset(); |
| sb.reset(abvs); |
| tvp.getValue(ap); |
| ap.appendItems(sb); |
| sb.finish(); |
| result.set(abvs); |
| break; |
| default: |
| throw new SystemException(ErrorCode.FORG0006); |
| } |
| } catch (IOException e) { |
| throw new SystemException(ErrorCode.SYSE0001, e); |
| } |
| } |
| } |