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The Apache Cassandra Project develops a highly scalable second-generation distributed database, bringing together Dynamo's fully distributed design and Bigtable's ColumnFamily-based data model.

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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.statements;

import org.apache.cassandra.cql3.CFName;
import org.apache.cassandra.service.ClientState;
import org.apache.cassandra.exceptions.InvalidRequestException;

/**
 * Abstract class for statements that apply on a given column family.
 */
public abstract class CFStatement extends ParsedStatement
{
    protected final CFName cfName;
    protected Boolean fullyQualified;
    protected CFStatement(CFName cfName)
    {
        this.cfName = cfName;
        this.fullyQualified = cfName != null ? cfName.hasKeyspace() : null;
    }

    public void prepareKeyspace(ClientState state) throws InvalidRequestException
    {
        if (!cfName.hasKeyspace())
        {
            // XXX: We explicitly only want to call state.getKeyspace() in this case, as we don't want to throw
            // if not logged in any keyspace but a keyspace is explicitely set on the statement. So don't move
            // the call outside the 'if' or replace the method by 'prepareKeyspace(state.getKeyspace())'
            cfName.setKeyspace(state.getKeyspace(), true);
        }
    }

    // Only for internal calls, use the version with ClientState for user queries
    public void prepareKeyspace(String keyspace)
    {
        if (!cfName.hasKeyspace())
            cfName.setKeyspace(keyspace, true);
    }

    public boolean isFullyQualified()
    {
        if (fullyQualified == null)
            throw new IllegalStateException("Cannot determine whether or not the query was fully qualified");
        return fullyQualified;
    }

    public String keyspace()
    {
        assert cfName.hasKeyspace() : "The statement hasn't be prepared correctly";
        return cfName.getKeyspace();
    }

    public String columnFamily()
    {
        return cfName.getColumnFamily();
    }
}