/*
* Licensed to CRATE Technology GmbH ("Crate") under one or more contributor
* license agreements. See the NOTICE file distributed with this work for
* additional information regarding copyright ownership. Crate 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.
*
* However, if you have executed another commercial license agreement
* with Crate these terms will supersede the license and you may use the
* software solely pursuant to the terms of the relevant commercial agreement.
*/
package io.crate.operation.scalar.arithmetic;
import com.google.common.collect.ImmutableList;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.metadata.Scalar;
import io.crate.operation.Input;
import io.crate.operation.scalar.ScalarFunctionModule;
import io.crate.planner.symbol.Function;
import io.crate.planner.symbol.Literal;
import io.crate.planner.symbol.Symbol;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
public abstract class RoundFunction extends Scalar<Number, Number> {
public static final String NAME = "round";
public static void register(ScalarFunctionModule module) {
module.register(new FloatRoundFunction());
module.register(new DoubleRoundFunction());
module.register(new NoopRoundFunction(DataTypes.LONG));
module.register(new NoopRoundFunction(DataTypes.INTEGER));
module.register(new NoopRoundFunction(DataTypes.SHORT));
module.register(new NoopRoundFunction(DataTypes.BYTE));
module.register(new NoopRoundFunction(DataTypes.UNDEFINED));
}
@Override
public Symbol normalizeSymbol(Function symbol) {
Symbol argument = symbol.arguments().get(0);
if (argument.symbolType().isValueSymbol()) {
return Literal.newLiteral(info().returnType(), evaluate((Input) argument));
}
return symbol;
}
static class FloatRoundFunction extends RoundFunction {
private final static FunctionInfo INFO = new FunctionInfo(
new FunctionIdent(NAME, ImmutableList.<DataType>of(DataTypes.FLOAT)), DataTypes.INTEGER);
@Override
public FunctionInfo info() {
return INFO;
}
@Override
public Number evaluate(Input[] args) {
Object value = args[0].value();
if (value == null) {
return null;
}
return Math.round(((Number) value).floatValue());
}
}
static class DoubleRoundFunction extends RoundFunction {
private final static FunctionInfo INFO = new FunctionInfo(
new FunctionIdent(NAME, ImmutableList.<DataType>of(DataTypes.DOUBLE)), DataTypes.LONG);
@Override
public FunctionInfo info() {
return INFO;
}
@Override
public Number evaluate(Input[] args) {
Object value = args[0].value();
if (value == null) {
return null;
}
return Math.round(((Number) value).doubleValue());
}
}
private static class NoopRoundFunction extends RoundFunction {
private final FunctionInfo info;
public NoopRoundFunction(DataType type) {
info = new FunctionInfo(new FunctionIdent(NAME, ImmutableList.of(type)), type);
}
@Override
public FunctionInfo info() {
return info;
}
@Override
public Number evaluate(Input[] args) {
return (Number) args[0].value();
}
}
}