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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.functions.masking;

import com.google.common.collect.ObjectArrays;

import org.apache.cassandra.cql3.functions.FunctionFactory;
import org.apache.cassandra.cql3.functions.FunctionName;
import org.apache.cassandra.cql3.functions.FunctionParameter;
import org.apache.cassandra.cql3.functions.NativeScalarFunction;
import org.apache.cassandra.db.marshal.AbstractType;

/**
 * A {@link NativeScalarFunction} that totally or partially replaces the original value of a column value,
 * meant to obscure the real value of the column.
 * 
 * The names of all masking functions share a common prefix, {@link MaskingFunction#NAME_PREFIX}, to easily identify
 * their purpose.
 */
public abstract class MaskingFunction extends NativeScalarFunction
{
    /** The common prefix for the names of all the native data masking functions. */
    public static final String NAME_PREFIX = "mask_";

    /**
     * @param name the name of the function
     * @param outputType the type of the values returned by the function
     * @param inputType the type of the values accepted by the function, always be the first argument of the function
     * @param argsType the type of the additional arguments of the function
     */
    protected MaskingFunction(FunctionName name,
                              AbstractType outputType,
                              AbstractType inputType,
                              AbstractType... argsType)
    {
        super(name.name, outputType, ObjectArrays.concat(inputType, argsType));
    }

    protected static abstract class Factory extends FunctionFactory
    {
        public Factory(String name, FunctionParameter... parameters)
        {
            super(NAME_PREFIX + name.toLowerCase(), parameters);
        }
    }
}