792f606a64
Contains the cql3 grammer and supporting classes, which will be converted one by one. From commit bf599fb5b062cbcc652da78b7d699e7a01b949ad.
103 lines
3.2 KiB
Java
103 lines
3.2 KiB
Java
/*
|
|
* 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.cql3.selection.Selection.ResultSetBuilder;
|
|
import org.apache.cassandra.db.marshal.AbstractType;
|
|
import org.apache.cassandra.db.marshal.UTF8Type;
|
|
import org.apache.cassandra.db.marshal.UserType;
|
|
import org.apache.cassandra.exceptions.InvalidRequestException;
|
|
|
|
final class FieldSelector extends Selector
|
|
{
|
|
private final UserType type;
|
|
private final int field;
|
|
private final Selector selected;
|
|
|
|
public static Factory newFactory(final UserType type, final int field, final Selector.Factory factory)
|
|
{
|
|
return new Factory()
|
|
{
|
|
protected String getColumnName()
|
|
{
|
|
return String.format("%s.%s",
|
|
factory.getColumnName(),
|
|
UTF8Type.instance.getString(type.fieldName(field)));
|
|
}
|
|
|
|
protected AbstractType<?> getReturnType()
|
|
{
|
|
return type.fieldType(field);
|
|
}
|
|
|
|
public Selector newInstance() throws InvalidRequestException
|
|
{
|
|
return new FieldSelector(type, field, factory.newInstance());
|
|
}
|
|
|
|
public boolean isAggregateSelectorFactory()
|
|
{
|
|
return factory.isAggregateSelectorFactory();
|
|
}
|
|
};
|
|
}
|
|
|
|
public boolean isAggregate()
|
|
{
|
|
return false;
|
|
}
|
|
|
|
public void addInput(int protocolVersion, ResultSetBuilder rs) throws InvalidRequestException
|
|
{
|
|
selected.addInput(protocolVersion, rs);
|
|
}
|
|
|
|
public ByteBuffer getOutput(int protocolVersion) throws InvalidRequestException
|
|
{
|
|
ByteBuffer value = selected.getOutput(protocolVersion);
|
|
if (value == null)
|
|
return null;
|
|
ByteBuffer[] buffers = type.split(value);
|
|
return field < buffers.length ? buffers[field] : null;
|
|
}
|
|
|
|
public AbstractType<?> getType()
|
|
{
|
|
return type.fieldType(field);
|
|
}
|
|
|
|
public void reset()
|
|
{
|
|
selected.reset();
|
|
}
|
|
|
|
@Override
|
|
public String toString()
|
|
{
|
|
return String.format("%s.%s", selected, UTF8Type.instance.getString(type.fieldName(field)));
|
|
}
|
|
|
|
private FieldSelector(UserType type, int field, Selector selected)
|
|
{
|
|
this.type = type;
|
|
this.field = field;
|
|
this.selected = selected;
|
|
}
|
|
} |