| /* |
| * 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; |
| |
| import java.util.Iterator; |
| |
| import org.apache.drill.categories.VectorTest; |
| import org.apache.drill.exec.record.HyperVectorWrapper; |
| import org.apache.drill.exec.record.MaterializedField; |
| import org.apache.drill.exec.vector.ValueVector; |
| import org.junit.experimental.categories.Category; |
| |
| @Category(VectorTest.class) |
| public class HyperVectorValueIterator implements Iterator<Object> { |
| private MaterializedField mf; |
| private HyperVectorWrapper<?> hyperVector; |
| private int indexInVectorList; |
| private int indexInCurrentVector; |
| private ValueVector currVec; |
| private long totalValues; |
| private long totalValuesRead; |
| // limit how many values will be read out of this iterator |
| private long recordLimit; |
| |
| public HyperVectorValueIterator(MaterializedField mf, HyperVectorWrapper<?> hyperVector) { |
| this.mf = mf; |
| this.hyperVector = hyperVector; |
| this.totalValues = 0; |
| this.indexInCurrentVector = 0; |
| this.indexInVectorList = 0; |
| this.recordLimit = -1; |
| } |
| |
| public void setRecordLimit(long limit) { |
| this.recordLimit = limit; |
| } |
| |
| public HyperVectorWrapper<?> getHyperVector() { |
| return hyperVector; |
| } |
| |
| public long getTotalRecords() { |
| if (recordLimit > 0) { |
| return recordLimit; |
| } else { |
| return totalValues; |
| } |
| } |
| |
| public void determineTotalSize() { |
| for (ValueVector vv : hyperVector.getValueVectors()) { |
| this.totalValues += vv.getAccessor().getValueCount(); |
| } |
| } |
| |
| @Override |
| public boolean hasNext() { |
| if (totalValuesRead == recordLimit) { |
| return false; |
| } |
| if (indexInVectorList < hyperVector.getValueVectors().length) { |
| return true; |
| } else if ( indexInCurrentVector < currVec.getAccessor().getValueCount()) { |
| return true; |
| } |
| return false; |
| } |
| |
| @Override |
| public Object next() { |
| if (currVec == null || indexInCurrentVector == currVec.getAccessor().getValueCount()) { |
| currVec = hyperVector.getValueVectors()[indexInVectorList]; |
| indexInVectorList++; |
| indexInCurrentVector = 0; |
| } |
| Object obj = currVec.getAccessor().getObject(indexInCurrentVector); |
| indexInCurrentVector++; |
| totalValuesRead++; |
| return obj; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| } |