/*
* 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.base.Preconditions;
import com.google.common.collect.Iterables;
import com.google.common.collect.Sets;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.metadata.Scalar;
import io.crate.operation.Input;
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;
import java.util.Arrays;
import java.util.List;
import java.util.Set;
abstract class ArithmeticFunction extends Scalar<Number, Number> {
private final static Set<DataType> NUMERIC_WITH_DECIMAL =
Sets.<DataType>newHashSet(DataTypes.FLOAT, DataTypes.DOUBLE);
private final static Set<DataType> ALLOWED_TYPES = Sets.<DataType>newHashSet(
Iterables.<DataType>concat(DataTypes.NUMERIC_PRIMITIVE_TYPES, Arrays.asList(DataTypes.TIMESTAMP))
);
protected final FunctionInfo info;
public ArithmeticFunction(FunctionInfo info) {
this.info = info;
}
@Override
public FunctionInfo info() {
return info;
}
@SuppressWarnings("unchecked")
public Symbol normalizeSymbol(Function symbol) {
assert symbol.arguments().size() == 2;
Symbol left = symbol.arguments().get(0);
Symbol right = symbol.arguments().get(1);
if (left.symbolType().isValueSymbol() && right.symbolType().isValueSymbol()) {
return Literal.newLiteral(info.returnType(), evaluate(new Input[]{(Input) left, (Input) right}));
}
return symbol;
}
protected static FunctionInfo genDoubleInfo(String functionName, List<DataType> dataTypes) {
return new FunctionInfo(new FunctionIdent(functionName, dataTypes), DataTypes.DOUBLE);
}
protected static FunctionInfo genLongInfo(String functionName, List<DataType> dataTypes) {
return new FunctionInfo(new FunctionIdent(functionName, dataTypes), DataTypes.LONG);
}
protected static void validateTypes(List<DataType> dataTypes) {
Preconditions.checkArgument(dataTypes.size() == 2);
DataType leftType = dataTypes.get(0);
DataType rightType = dataTypes.get(1);
Preconditions.checkArgument(ALLOWED_TYPES.contains(leftType),
"invalid type %s of left argument", leftType.toString());
Preconditions.checkArgument(ALLOWED_TYPES.contains(rightType),
"invalid type %s of right argument", leftType.toString());
}
protected static boolean containsTypesWithDecimal(List<DataType> dataTypes) {
for (DataType dataType : dataTypes) {
if (NUMERIC_WITH_DECIMAL.contains(dataType)) {
return true;
}
}
return false;
}
}