| /* |
| * 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; |
| |
| import static org.apache.arrow.vector.complex.BaseRepeatedValueVector.DATA_VECTOR_NAME; |
| |
| import java.util.Collections; |
| import java.util.Iterator; |
| import java.util.List; |
| |
| import org.apache.arrow.memory.BufferAllocator; |
| import org.apache.arrow.memory.OutOfMemoryException; |
| import org.apache.arrow.vector.compare.VectorVisitor; |
| import org.apache.arrow.vector.complex.impl.NullReader; |
| import org.apache.arrow.vector.complex.reader.FieldReader; |
| import org.apache.arrow.vector.ipc.message.ArrowFieldNode; |
| import org.apache.arrow.vector.types.Types.MinorType; |
| import org.apache.arrow.vector.types.pojo.ArrowType.Null; |
| import org.apache.arrow.vector.types.pojo.Field; |
| import org.apache.arrow.vector.types.pojo.FieldType; |
| import org.apache.arrow.vector.util.CallBack; |
| import org.apache.arrow.vector.util.TransferPair; |
| |
| import io.netty.buffer.ArrowBuf; |
| |
| /** |
| * A zero length vector of any type. |
| */ |
| public final class ZeroVector implements FieldVector { |
| public static final ZeroVector INSTANCE = new ZeroVector(); |
| |
| private final TransferPair defaultPair = new TransferPair() { |
| @Override |
| public void transfer() { |
| } |
| |
| @Override |
| public void splitAndTransfer(int startIndex, int length) { |
| } |
| |
| @Override |
| public ValueVector getTo() { |
| return ZeroVector.this; |
| } |
| |
| @Override |
| public void copyValueSafe(int from, int to) { |
| } |
| }; |
| |
| |
| public ZeroVector() { |
| } |
| |
| @Override |
| public void close() { |
| } |
| |
| @Override |
| public void clear() { |
| } |
| |
| @Override |
| public void reset() { |
| } |
| |
| @Override |
| public Field getField() { |
| return new Field(DATA_VECTOR_NAME, FieldType.nullable(new Null()), null); |
| } |
| |
| @Override |
| public MinorType getMinorType() { |
| return MinorType.NULL; |
| } |
| |
| |
| @Override |
| public TransferPair getTransferPair(BufferAllocator allocator) { |
| return defaultPair; |
| } |
| |
| @Override |
| public Iterator<ValueVector> iterator() { |
| return Collections.emptyIterator(); |
| } |
| |
| @Override |
| public int getBufferSize() { |
| return 0; |
| } |
| |
| @Override |
| public int getBufferSizeFor(final int valueCount) { |
| return 0; |
| } |
| |
| @Override |
| public ArrowBuf[] getBuffers(boolean clear) { |
| return new ArrowBuf[0]; |
| } |
| |
| @Override |
| public void allocateNew() throws OutOfMemoryException { |
| allocateNewSafe(); |
| } |
| |
| @Override |
| public boolean allocateNewSafe() { |
| return true; |
| } |
| |
| @Override |
| public void reAlloc() { |
| } |
| |
| @Override |
| public BufferAllocator getAllocator() { |
| throw new UnsupportedOperationException("Tried to get allocator from ZeroVector"); |
| } |
| |
| @Override |
| public void setInitialCapacity(int numRecords) { |
| } |
| |
| @Override |
| public int getValueCapacity() { |
| return 0; |
| } |
| |
| @Override |
| public TransferPair getTransferPair(String ref, BufferAllocator allocator) { |
| return defaultPair; |
| } |
| |
| @Override |
| public TransferPair getTransferPair(String ref, BufferAllocator allocator, CallBack callBack) { |
| return defaultPair; |
| } |
| |
| @Override |
| public TransferPair makeTransferPair(ValueVector target) { |
| return defaultPair; |
| } |
| |
| @Override |
| public FieldReader getReader() { |
| return NullReader.INSTANCE; |
| } |
| |
| @Override |
| public void initializeChildrenFromFields(List<Field> children) { |
| if (!children.isEmpty()) { |
| throw new IllegalArgumentException("Zero vector has no children"); |
| } |
| } |
| |
| @Override |
| public List<FieldVector> getChildrenFromFields() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public void loadFieldBuffers(ArrowFieldNode fieldNode, List<ArrowBuf> ownBuffers) { |
| if (!ownBuffers.isEmpty()) { |
| throw new IllegalArgumentException("Zero vector has no buffers"); |
| } |
| } |
| |
| @Override |
| public List<ArrowBuf> getFieldBuffers() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public List<BufferBacked> getFieldInnerVectors() { |
| return Collections.emptyList(); |
| } |
| |
| @Override |
| public long getValidityBufferAddress() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long getDataBufferAddress() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public long getOffsetBufferAddress() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public ArrowBuf getValidityBuffer() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public ArrowBuf getDataBuffer() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public ArrowBuf getOffsetBuffer() { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public int getValueCount() { |
| return 0; |
| } |
| |
| @Override |
| public void setValueCount(int valueCount) { |
| } |
| |
| @Override |
| public Object getObject(int index) { |
| return null; |
| } |
| |
| @Override |
| public int getNullCount() { |
| return 0; |
| } |
| |
| @Override |
| public boolean isNull(int index) { |
| return false; |
| } |
| |
| @Override |
| public int hashCode(int index) { |
| return 0; |
| } |
| |
| @Override |
| public <OUT, IN> OUT accept(VectorVisitor<OUT, IN> visitor, IN value) { |
| return visitor.visit(this, value); |
| } |
| |
| @Override |
| public void copyFrom(int fromIndex, int thisIndex, ValueVector from) { |
| throw new UnsupportedOperationException(); |
| } |
| |
| @Override |
| public void copyFromSafe(int fromIndex, int thisIndex, ValueVector from) { |
| throw new UnsupportedOperationException(); |
| } |
| } |