| /******************************************************************************* |
| |
| * 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 java.util.Map; |
| |
| import org.apache.arrow.vector.ValueVector; |
| import org.apache.arrow.vector.complex.RepeatedMapVector; |
| import org.apache.arrow.vector.complex.reader.FieldReader; |
| import org.apache.arrow.vector.complex.writer.BaseWriter.MapWriter; |
| import org.apache.arrow.vector.holders.RepeatedMapHolder; |
| import org.apache.arrow.vector.types.Types.MajorType; |
| |
| import com.google.common.collect.Maps; |
| |
| @SuppressWarnings("unused") |
| public class RepeatedMapReaderImpl extends AbstractFieldReader{ |
| private static final int NO_VALUES = Integer.MAX_VALUE - 1; |
| |
| private final RepeatedMapVector vector; |
| private final Map<String, FieldReader> fields = Maps.newHashMap(); |
| |
| public RepeatedMapReaderImpl(RepeatedMapVector vector) { |
| this.vector = vector; |
| } |
| |
| private void setChildrenPosition(int index) { |
| for (FieldReader r : fields.values()) { |
| r.setPosition(index); |
| } |
| } |
| |
| @Override |
| public FieldReader reader(String name) { |
| FieldReader reader = fields.get(name); |
| if (reader == null) { |
| ValueVector child = vector.getChild(name); |
| if (child == null) { |
| reader = NullReader.INSTANCE; |
| } else { |
| reader = child.getReader(); |
| } |
| fields.put(name, reader); |
| reader.setPosition(currentOffset); |
| } |
| return reader; |
| } |
| |
| @Override |
| public FieldReader reader() { |
| if (currentOffset == NO_VALUES) { |
| return NullReader.INSTANCE; |
| } |
| |
| setChildrenPosition(currentOffset); |
| return new SingleLikeRepeatedMapReaderImpl(vector, this); |
| } |
| |
| private int currentOffset; |
| private int maxOffset; |
| |
| @Override |
| public void reset() { |
| super.reset(); |
| currentOffset = 0; |
| maxOffset = 0; |
| for (FieldReader reader:fields.values()) { |
| reader.reset(); |
| } |
| fields.clear(); |
| } |
| |
| @Override |
| public int size() { |
| if (isNull()) { |
| return 0; |
| } |
| return maxOffset - (currentOffset < 0 ? 0 : currentOffset); |
| } |
| |
| @Override |
| public void setPosition(int index) { |
| if (index < 0 || index == NO_VALUES) { |
| currentOffset = NO_VALUES; |
| return; |
| } |
| |
| super.setPosition(index); |
| RepeatedMapHolder h = new RepeatedMapHolder(); |
| vector.getAccessor().get(index, h); |
| if (h.start == h.end) { |
| currentOffset = NO_VALUES; |
| } else { |
| currentOffset = h.start-1; |
| maxOffset = h.end; |
| setChildrenPosition(currentOffset); |
| } |
| } |
| |
| public void setSinglePosition(int index, int childIndex) { |
| super.setPosition(index); |
| RepeatedMapHolder h = new RepeatedMapHolder(); |
| vector.getAccessor().get(index, h); |
| if (h.start == h.end) { |
| currentOffset = NO_VALUES; |
| } else { |
| int singleOffset = h.start + childIndex; |
| assert singleOffset < h.end; |
| currentOffset = singleOffset; |
| maxOffset = singleOffset + 1; |
| setChildrenPosition(singleOffset); |
| } |
| } |
| |
| @Override |
| public boolean next() { |
| if (currentOffset +1 < maxOffset) { |
| setChildrenPosition(++currentOffset); |
| return true; |
| } else { |
| currentOffset = NO_VALUES; |
| return false; |
| } |
| } |
| |
| public boolean isNull() { |
| return currentOffset == NO_VALUES; |
| } |
| |
| @Override |
| public Object readObject() { |
| return vector.getAccessor().getObject(idx()); |
| } |
| |
| @Override |
| public MajorType getType() { |
| return vector.getField().getType(); |
| } |
| |
| @Override |
| public java.util.Iterator<String> iterator() { |
| return vector.fieldNameIterator(); |
| } |
| |
| @Override |
| public boolean isSet() { |
| return true; |
| } |
| |
| @Override |
| public void copyAsValue(MapWriter writer) { |
| if (currentOffset == NO_VALUES) { |
| return; |
| } |
| RepeatedMapWriter impl = (RepeatedMapWriter) writer; |
| impl.container.copyFromSafe(idx(), impl.idx(), vector); |
| } |
| |
| public void copyAsValueSingle(MapWriter writer) { |
| if (currentOffset == NO_VALUES) { |
| return; |
| } |
| SingleMapWriter impl = (SingleMapWriter) writer; |
| impl.container.copyFromSafe(currentOffset, impl.idx(), vector); |
| } |
| |
| @Override |
| public void copyAsField(String name, MapWriter writer) { |
| if (currentOffset == NO_VALUES) { |
| return; |
| } |
| RepeatedMapWriter impl = (RepeatedMapWriter) writer.map(name); |
| impl.container.copyFromSafe(idx(), impl.idx(), vector); |
| } |
| |
| } |