/*
 * 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.QueryOptions;
import org.apache.cassandra.cql3.Term;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.transport.ProtocolVersion;

Selector representing a simple term (literals or bound variables).

Note that we know the term does not include function calls for instance (this is actually enforced by the parser), those
being dealt with by their own Selector.
/**
 * Selector representing a simple term (literals or bound variables).
 * <p>
 * Note that we know the term does not include function calls for instance (this is actually enforced by the parser), those
 * being dealt with by their own Selector.
 */
public class TermSelector extends Selector
{
    private final ByteBuffer value;
    private final AbstractType<?> type;

    public static Factory newFactory(final String name, final Term term, final AbstractType<?> type)
    {
        return new Factory()
        {
            protected String getColumnName()
            {
                return name;
            }

            protected AbstractType<?> getReturnType()
            {
                return type;
            }

            protected void addColumnMapping(SelectionColumnMapping mapping, ColumnSpecification resultColumn)
            {
               mapping.addMapping(resultColumn, (ColumnDefinition)null);
            }

            public Selector newInstance(QueryOptions options)
            {
                return new TermSelector(term.bindAndGet(options), type);
            }
        };
    }

    private TermSelector(ByteBuffer value, AbstractType<?> type)
    {
        this.value = value;
        this.type = type;
    }

    public void addInput(ProtocolVersion protocolVersion, Selection.ResultSetBuilder rs) throws InvalidRequestException
    {
    }

    public ByteBuffer getOutput(ProtocolVersion protocolVersion) throws InvalidRequestException
    {
        return value;
    }

    public AbstractType<?> getType()
    {
        return type;
    }

    public void reset()
    {
    }
}