| /* |
| * 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.drill.exec.vector.complex.impl; |
| |
| import java.util.HashMap; |
| import java.util.Iterator; |
| import java.util.Map; |
| |
| import org.apache.drill.common.types.TypeProtos.MajorType; |
| import org.apache.drill.exec.expr.holders.RepeatedMapHolder; |
| import org.apache.drill.exec.vector.UInt4Vector; |
| import org.apache.drill.exec.vector.ValueVector; |
| import org.apache.drill.exec.vector.complex.AbstractRepeatedMapVector; |
| import org.apache.drill.exec.vector.complex.reader.FieldReader; |
| |
| @SuppressWarnings("unused") |
| public abstract class AbstractRepeatedMapReaderImpl<V extends AbstractRepeatedMapVector> extends AbstractFieldReader { |
| protected static final int NO_VALUES = Integer.MAX_VALUE - 1; |
| |
| protected final V vector; |
| protected final Map<String, FieldReader> fields = new HashMap<>(); |
| protected int currentOffset; |
| protected int maxOffset; |
| |
| public AbstractRepeatedMapReaderImpl(V vector) { |
| this.vector = vector; |
| } |
| |
| @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 void reset() { |
| super.reset(); |
| currentOffset = 0; |
| maxOffset = 0; |
| for (FieldReader reader:fields.values()) { |
| reader.reset(); |
| } |
| fields.clear(); |
| } |
| |
| @Override |
| public int size() { |
| UInt4Vector.Accessor offsetsAccessor = vector.getOffsetVector().getAccessor(); |
| return isEmpty() ? 0 : offsetsAccessor.get(idx() + 1) - offsetsAccessor.get(idx()); |
| } |
| |
| @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 - 1; |
| setChildrenPosition(currentOffset); |
| } |
| } |
| |
| @Override |
| public boolean next() { |
| if (currentOffset < maxOffset) { |
| setChildrenPosition(++currentOffset); |
| return true; |
| } else { |
| currentOffset = NO_VALUES; |
| return false; |
| } |
| } |
| |
| public boolean isEmpty() { |
| return currentOffset == NO_VALUES; |
| } |
| |
| @Override |
| public Object readObject() { |
| return vector.getAccessor().getObject(idx()); |
| } |
| |
| @Override |
| public MajorType getType() { |
| return vector.getField().getType(); |
| } |
| |
| @Override |
| public Iterator<String> iterator() { |
| return vector.fieldNameIterator(); |
| } |
| |
| @Override |
| public boolean isSet() { |
| return true; |
| } |
| |
| void setChildrenPosition(int index) { |
| for (FieldReader r : fields.values()) { |
| r.setPosition(index); |
| } |
| } |
| } |