/*
* 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.cast;
import com.google.common.base.Preconditions;
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.ArrayType;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import java.util.List;
import java.util.Locale;
public abstract class ToArrayFunction<T> extends Scalar<T[], Object> {
protected final DataType returnType;
private final FunctionInfo info;
protected ToArrayFunction(FunctionInfo functionInfo) {
this.returnType = functionInfo.returnType();
this.info = functionInfo;
}
protected static void checkPreconditions(List<DataType> dataTypes) throws IllegalArgumentException {
Preconditions.checkArgument(dataTypes.size() == 1, "Invalid number of arguments");
Preconditions.checkArgument(dataTypes.get(0) instanceof ArrayType, "Argument must be an array type");
ArrayType arrayType = (ArrayType) dataTypes.get(0);
Preconditions.checkArgument(DataTypes.PRIMITIVE_TYPES.contains(arrayType.innerType()),
String.format(Locale.ENGLISH, "Array inner type '%s' not supported for conversion",
arrayType.innerType().getName()));
}
@Override
public FunctionInfo info() {
return info;
}
@Override
public Symbol normalizeSymbol(Function symbol) {
final int size = symbol.arguments().size();
assert size == 1 : "Invalid number of arguments";
if (anyNonLiterals(symbol.arguments())) {
return symbol;
}
final Object inputValue = ((Input) symbol.arguments().get(0)).value();
return Literal.newLiteral(returnType, returnType.value(inputValue));
}
@Override
@SuppressWarnings("unchecked")
public T[] evaluate(Input[] args) {
assert args.length == 1 : "Number of arguments must be 1";
return (T[]) returnType.value(args[0].value());
}
}