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A fork of the Apache Cassandra Project ready to embed Elasticsearch.
/*
* 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.config.ColumnDefinition;
import org.apache.cassandra.cql3.ColumnSpecification;
import org.apache.cassandra.cql3.selection.Selection.ResultSetBuilder;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.exceptions.InvalidRequestException;
public final class SimpleSelector extends Selector
{
private final String columnName;
private final int idx;
private final AbstractType type;
private ByteBuffer current;
private boolean isSet;
public static Factory newFactory(final ColumnDefinition def, final int idx)
{
return new Factory()
{
@Override
protected String getColumnName()
{
return def.name.toString();
}
@Override
protected AbstractType getReturnType()
{
return def.type;
}
protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn)
{
mapping.addMapping(resultColumn, def);
}
@Override
public Selector newInstance()
{
return new SimpleSelector(def.name.toString(), idx, def.type);
}
@Override
public boolean isSimpleSelectorFactory(int index)
{
return index == idx;
}
};
}
@Override
public void addInput(int protocolVersion, ResultSetBuilder rs) throws InvalidRequestException
{
if (!isSet)
{
isSet = true;
current = rs.current.get(idx);
}
}
@Override
public ByteBuffer getOutput(int protocolVersion) throws InvalidRequestException
{
return current;
}
@Override
public void reset()
{
isSet = false;
current = null;
}
@Override
public AbstractType getType()
{
return type;
}
@Override
public String toString()
{
return columnName;
}
private SimpleSelector(String columnName, int idx, AbstractType type)
{
this.columnName = columnName;
this.idx = idx;
this.type = type;
}
}