/
BaseValueVector.java
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/
BaseValueVector.java
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/**
* 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;
import io.netty.buffer.DrillBuf;
import java.util.Iterator;
import com.google.common.base.Preconditions;
import com.google.common.collect.Iterators;
import org.apache.drill.common.expression.FieldReference;
import org.apache.drill.exec.memory.BufferAllocator;
import org.apache.drill.exec.proto.UserBitShared.SerializedField;
import org.apache.drill.exec.record.MaterializedField;
import org.apache.drill.exec.record.TransferPair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class BaseValueVector implements ValueVector {
private static final Logger logger = LoggerFactory.getLogger(BaseValueVector.class);
public static final int MAX_ALLOCATION_SIZE = Integer.MAX_VALUE;
public static final int INITIAL_VALUE_ALLOCATION = 4096;
protected final BufferAllocator allocator;
protected final MaterializedField field;
protected BaseValueVector(MaterializedField field, BufferAllocator allocator) {
this.field = Preconditions.checkNotNull(field, "field cannot be null");
this.allocator = Preconditions.checkNotNull(allocator, "allocator cannot be null");
}
@Override
public void clear() {
getMutator().reset();
}
@Override
public void close() {
clear();
}
@Override
public MaterializedField getField() {
return field;
}
public MaterializedField getField(FieldReference ref){
return getField().withPath(ref);
}
@Override
public TransferPair getTransferPair() {
return getTransferPair(new FieldReference(getField().getPath()));
}
@Override
public SerializedField getMetadata() {
return getMetadataBuilder().build();
}
protected SerializedField.Builder getMetadataBuilder() {
return getField().getAsBuilder()
.setValueCount(getAccessor().getValueCount())
.setBufferLength(getBufferSize());
}
public abstract static class BaseAccessor implements ValueVector.Accessor {
protected BaseAccessor() { }
@Override
public boolean isNull(int index) {
return false;
}
}
public abstract static class BaseMutator implements ValueVector.Mutator {
protected BaseMutator() { }
@Override
public void generateTestData(int values) {}
//TODO: consider making mutator stateless(if possible) on another issue.
public void reset() {}
}
@Override
public Iterator<ValueVector> iterator() {
return Iterators.emptyIterator();
}
public static boolean checkBufRefs(final ValueVector vv) {
for(final DrillBuf buffer : vv.getBuffers(false)) {
if (buffer.refCnt() <= 0) {
throw new IllegalStateException("zero refcount");
}
}
return true;
}
}