| /******************************************************************************* |
| |
| * 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.ValueVector; |
| import org.apache.arrow.vector.complex.RepeatedListVector; |
| import org.apache.arrow.vector.complex.reader.FieldReader; |
| import org.apache.arrow.vector.complex.writer.BaseWriter.ListWriter; |
| import org.apache.arrow.vector.complex.writer.BaseWriter.MapWriter; |
| import org.apache.arrow.vector.holders.RepeatedListHolder; |
| 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 RepeatedListReaderImpl extends AbstractFieldReader{ |
| private static final int NO_VALUES = Integer.MAX_VALUE - 1; |
| private static final MajorType TYPE = new MajorType(MinorType.LIST, DataMode.REPEATED); |
| private final String name; |
| private final RepeatedListVector container; |
| private FieldReader reader; |
| |
| public RepeatedListReaderImpl(String name, RepeatedListVector container) { |
| super(); |
| this.name = name; |
| this.container = container; |
| } |
| |
| @Override |
| public MajorType getType() { |
| return TYPE; |
| } |
| |
| @Override |
| public void copyAsValue(ListWriter writer) { |
| if (currentOffset == NO_VALUES) { |
| return; |
| } |
| RepeatedListWriter impl = (RepeatedListWriter) writer; |
| impl.container.copyFromSafe(idx(), impl.idx(), container); |
| } |
| |
| @Override |
| public void copyAsField(String name, MapWriter writer) { |
| if (currentOffset == NO_VALUES) { |
| return; |
| } |
| RepeatedListWriter impl = (RepeatedListWriter) writer.list(name); |
| impl.container.copyFromSafe(idx(), impl.idx(), container); |
| } |
| |
| private int currentOffset; |
| private int maxOffset; |
| |
| @Override |
| public void reset() { |
| super.reset(); |
| currentOffset = 0; |
| maxOffset = 0; |
| if (reader != null) { |
| reader.reset(); |
| } |
| reader = null; |
| } |
| |
| @Override |
| public int size() { |
| return maxOffset - currentOffset; |
| } |
| |
| @Override |
| public void setPosition(int index) { |
| if (index < 0 || index == NO_VALUES) { |
| currentOffset = NO_VALUES; |
| return; |
| } |
| |
| super.setPosition(index); |
| RepeatedListHolder h = new RepeatedListHolder(); |
| container.getAccessor().get(index, h); |
| if (h.start == h.end) { |
| currentOffset = NO_VALUES; |
| } else { |
| currentOffset = h.start-1; |
| maxOffset = h.end; |
| if(reader != null) { |
| reader.setPosition(currentOffset); |
| } |
| } |
| } |
| |
| @Override |
| public boolean next() { |
| if (currentOffset +1 < maxOffset) { |
| currentOffset++; |
| if (reader != null) { |
| reader.setPosition(currentOffset); |
| } |
| return true; |
| } else { |
| currentOffset = NO_VALUES; |
| return false; |
| } |
| } |
| |
| @Override |
| public Object readObject() { |
| return container.getAccessor().getObject(idx()); |
| } |
| |
| @Override |
| public FieldReader reader() { |
| if (reader == null) { |
| ValueVector child = container.getChild(name); |
| if (child == null) { |
| reader = NullReader.INSTANCE; |
| } else { |
| reader = child.getReader(); |
| } |
| reader.setPosition(currentOffset); |
| } |
| return reader; |
| } |
| |
| public boolean isSet() { |
| return true; |
| } |
| |
| } |