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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.cassandra.cql3.selection;
import java.nio.ByteBuffer;
import org.apache.cassandra.schema.ColumnMetadata;
import org.apache.cassandra.cql3.ColumnSpecification;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.db.filter.ColumnFilter;
import org.apache.cassandra.db.filter.ColumnFilter.Builder;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.transport.ProtocolVersion;
public final class SimpleSelector extends Selector
{
/**
* The Factory for {@code SimpleSelector}.
*/
public static final class SimpleSelectorFactory extends Factory
{
private final int idx;
private final ColumnMetadata column;
private SimpleSelectorFactory(int idx, ColumnMetadata def)
{
this.idx = idx;
this.column = def;
}
@Override
protected String getColumnName()
{
return column.name.toString();
}
@Override
protected AbstractType<?> getReturnType()
{
return column.type;
}
protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn)
{
mapping.addMapping(resultColumn, column);
}
@Override
public Selector newInstance(QueryOptions options)
{
return new SimpleSelector(column, idx);
}
@Override
public boolean isSimpleSelectorFactory()
{
return true;
}
@Override
public boolean isSimpleSelectorFactoryFor(int index)
{
return index == idx;
}
public boolean areAllFetchedColumnsKnown()
{
return true;
}
public void addFetchedColumns(ColumnFilter.Builder builder)
{
builder.add(column);
}
public ColumnMetadata getColumn()
{
return column;
}
}
public final ColumnMetadata column;
private final int idx;
private ByteBuffer current;
private boolean isSet;
public static Factory newFactory(final ColumnMetadata def, final int idx)
{
return new SimpleSelectorFactory(idx, def);
}
@Override
public void addFetchedColumns(Builder builder)
{
builder.add(column);
}
@Override
public void addInput(ProtocolVersion protocolVersion, ResultSetBuilder rs) throws InvalidRequestException
{
if (!isSet)
{
isSet = true;
current = rs.current.get(idx);
}
}
@Override
public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException
{
return current;
}
@Override
public void reset()
{
isSet = false;
current = null;
}
@Override
public AbstractType<?> getType()
{
return column.type;
}
@Override
public String toString()
{
return column.name.toString();
}
private SimpleSelector(ColumnMetadata column, int idx)
{
this.column = column;
this.idx = idx;
}
}