| /******************************************************************************* |
| |
| * 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.arrow.vector.complex.impl; |
| |
| import org.apache.arrow.vector.UInt4Vector; |
| import org.apache.arrow.vector.ValueVector; |
| import org.apache.arrow.vector.complex.ListVector; |
| import org.apache.arrow.vector.complex.reader.FieldReader; |
| import org.apache.arrow.vector.complex.writer.BaseWriter.ListWriter; |
| import org.apache.arrow.vector.complex.writer.FieldWriter; |
| import org.apache.arrow.vector.holders.UnionHolder; |
| import org.apache.arrow.vector.types.Types.DataMode; |
| import org.apache.arrow.vector.types.Types.MajorType; |
| import org.apache.arrow.vector.types.Types.MinorType; |
| |
| public class UnionListReader extends AbstractFieldReader { |
| |
| private ListVector vector; |
| private ValueVector data; |
| private UInt4Vector offsets; |
| |
| public UnionListReader(ListVector vector) { |
| this.vector = vector; |
| this.data = vector.getDataVector(); |
| this.offsets = vector.getOffsetVector(); |
| } |
| |
| @Override |
| public boolean isSet() { |
| return true; |
| } |
| |
| MajorType type = new MajorType(MinorType.LIST, DataMode.OPTIONAL); |
| |
| public MajorType getType() { |
| return type; |
| } |
| |
| private int currentOffset; |
| private int maxOffset; |
| |
| @Override |
| public void setPosition(int index) { |
| super.setPosition(index); |
| currentOffset = offsets.getAccessor().get(index) - 1; |
| maxOffset = offsets.getAccessor().get(index + 1); |
| } |
| |
| @Override |
| public FieldReader reader() { |
| return data.getReader(); |
| } |
| |
| @Override |
| public Object readObject() { |
| return vector.getAccessor().getObject(idx()); |
| } |
| |
| @Override |
| public void read(int index, UnionHolder holder) { |
| setPosition(idx()); |
| for (int i = -1; i < index; i++) { |
| next(); |
| } |
| holder.reader = data.getReader(); |
| holder.isSet = data.getReader().isSet() ? 1 : 0; |
| } |
| |
| @Override |
| public boolean next() { |
| if (currentOffset + 1 < maxOffset) { |
| data.getReader().setPosition(++currentOffset); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| |
| public void copyAsValue(ListWriter writer) { |
| ComplexCopier.copy(this, (FieldWriter) writer); |
| } |
| } |