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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.restrictions;

import java.util.Collection;
import java.util.List;

import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.cql3.functions.Function;
import org.apache.cassandra.db.filter.RowFilter;
import org.apache.cassandra.exceptions.InvalidRequestException;
import org.apache.cassandra.index.SecondaryIndexManager;

/**
 * Sets of restrictions
 */
interface Restrictions
{
    /**
     * Returns the column definitions in position order.
     * @return the column definitions in position order.
     */
    public Collection getColumnDefs();

    /**
     * Adds all functions (native and user-defined) used by any component of the restriction
     * to the specified list.
     * @param functions the list to add to
     */
    public void addFunctionsTo(List functions);

    /**
     * Check if the restriction is on indexed columns.
     *
     * @param indexManager the index manager
     * @return true if the restriction is on indexed columns, false
     */
    public boolean hasSupportingIndex(SecondaryIndexManager indexManager);

    /**
     * Adds to the specified row filter the expressions corresponding to this Restrictions.
     *
     * @param filter the row filter to add expressions to
     * @param indexManager the secondary index manager
     * @param options the query options
     * @throws InvalidRequestException if this Restrictions cannot be converted into a row filter
     */
    public void addRowFilterTo(RowFilter filter, SecondaryIndexManager indexManager, QueryOptions options) throws InvalidRequestException;

    /**
     * Checks if this PrimaryKeyRestrictionSet is empty or not.
     *
     * @return true if this PrimaryKeyRestrictionSet is empty, false otherwise.
     */
    boolean isEmpty();

    /**
     * Returns the number of columns that have a restriction.
     *
     * @return the number of columns that have a restriction.
     */
    public int size();
}