| /* |
| * 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; |
| |
| import java.nio.ByteBuffer; |
| import java.util.Collection; |
| import java.util.List; |
| |
| import com.google.common.collect.ImmutableList; |
| import org.apache.cassandra.db.marshal.*; |
| import org.apache.cassandra.transport.ProtocolVersion; |
| |
| public final class MathFcts |
| { |
| public static void addFunctionsTo(NativeFunctions functions) |
| { |
| final List<NumberType<?>> numericTypes = ImmutableList.of(ByteType.instance, |
| ShortType.instance, |
| Int32Type.instance, |
| FloatType.instance, |
| LongType.instance, |
| DoubleType.instance, |
| IntegerType.instance, |
| DecimalType.instance, |
| CounterColumnType.instance); |
| |
| numericTypes.stream() |
| .map(t -> ImmutableList.of(absFct(t), |
| expFct(t), |
| logFct(t), |
| log10Fct(t), |
| roundFct(t))) |
| .flatMap(Collection::stream) |
| .forEach(f -> functions.add(f)); |
| } |
| |
| public static NativeFunction absFct(final NumberType<?> type) |
| { |
| return new NativeScalarFunction("abs", type, type) |
| { |
| @Override |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| ByteBuffer bb = parameters.get(0); |
| if (bb == null) |
| return null; |
| return type.abs(bb); |
| } |
| }; |
| } |
| |
| public static NativeFunction expFct(final NumberType<?> type) |
| { |
| return new NativeScalarFunction("exp", type, type) |
| { |
| @Override |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| ByteBuffer bb = parameters.get(0); |
| if (bb == null) |
| return null; |
| return type.exp(bb); |
| } |
| }; |
| } |
| |
| public static NativeFunction logFct(final NumberType<?> type) |
| { |
| return new NativeScalarFunction("log", type, type) |
| { |
| @Override |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| ByteBuffer bb = parameters.get(0); |
| if (bb == null) |
| return null; |
| return type.log(bb); |
| |
| } |
| }; |
| } |
| |
| public static NativeFunction log10Fct(final NumberType<?> type) |
| { |
| return new NativeScalarFunction("log10", type, type) |
| { |
| @Override |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| ByteBuffer bb = parameters.get(0); |
| if (bb == null) |
| return null; |
| return type.log10(bb); |
| |
| } |
| }; |
| } |
| |
| public static NativeFunction roundFct(final NumberType<?> type) |
| { |
| return new NativeScalarFunction("round", type, type) |
| { |
| @Override |
| public ByteBuffer execute(ProtocolVersion protocolVersion, List<ByteBuffer> parameters) |
| { |
| ByteBuffer bb = parameters.get(0); |
| if (bb == null) |
| return null; |
| return type.round(bb); |
| |
| } |
| }; |
| } |
| |
| private MathFcts() |
| { |
| } |
| } |