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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.accessor.writer;
import org.apache.drill.exec.record.metadata.ColumnMetadata;
import org.apache.drill.exec.vector.BaseDataValueVector;
import org.apache.drill.exec.vector.accessor.ColumnConversionFactory;
import org.apache.drill.exec.vector.accessor.ColumnWriterIndex;
import org.apache.drill.exec.vector.accessor.ObjectType;
import org.apache.drill.exec.vector.accessor.ScalarWriter;
import org.apache.drill.exec.vector.accessor.impl.HierarchicalFormatter;
/**
* Column writer implementation that acts as the basis for the
* generated, vector-specific implementations. All set methods
* throw an exception; subclasses simply override the supported
* method(s).
*/
public abstract class AbstractScalarWriter extends ConcreteWriter {
public static class ScalarObjectWriter extends AbstractObjectWriter {
private ConcreteWriter scalarWriter;
public ScalarObjectWriter(ConcreteWriter scalarWriter) {
final ColumnMetadata metadata = scalarWriter.schema();
final ColumnConversionFactory factory = metadata.typeConverter();
if (factory == null) {
this.scalarWriter = scalarWriter;
} else {
this.scalarWriter = factory.newWriter(metadata, scalarWriter);
}
}
@Override
public ScalarWriter scalar() { return scalarWriter; }
@Override
public WriterEvents events() { return scalarWriter; }
@Override
public void dump(HierarchicalFormatter format) {
format
.startObject(this)
.attribute("scalarWriter");
scalarWriter.dump(format);
format.endObject();
}
}
protected ColumnMetadata schema;
/**
* Indicates the position in the vector to write. Set via an object so that
* all writers (within the same subtree) can agree on the write position.
* For example, all top-level, simple columns see the same row index.
* All columns within a repeated map see the same (inner) index, etc.
*/
protected ColumnWriterIndex vectorIndex;
@Override
public ObjectType type() { return ObjectType.SCALAR; }
public void bindSchema(ColumnMetadata schema) {
this.schema = schema;
}
@Override
public void bindIndex(ColumnWriterIndex vectorIndex) {
this.vectorIndex = vectorIndex;
}
@Override
public int rowStartIndex() {
return vectorIndex.rowStartIndex();
}
@Override
public int writeIndex() {
return vectorIndex.vectorIndex();
}
@Override
public ColumnMetadata schema() { return schema; }
public abstract BaseDataValueVector vector();
@Override
public void startWrite() { }
@Override
public void startRow() { }
@Override
public void endArrayValue() { }
@Override
public void saveRow() { }
@Override
public void dump(HierarchicalFormatter format) {
format
.startObject(this)
.attributeIdentity("vector", vector())
.attribute("schema", vector().getField())
.endObject();
}
}
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