/*
* 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;
import com.google.common.collect.ImmutableList;
import io.crate.metadata.FunctionIdent;
import io.crate.metadata.FunctionInfo;
import io.crate.operation.Input;
import io.crate.planner.symbol.*;
import io.crate.types.DataType;
import io.crate.types.DataTypes;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.rounding.DateTimeUnit;
import org.joda.time.DateTimeZone;
public class DateTruncFunction extends BaseDateTruncFunction {
public static void register(ScalarFunctionModule module) {
module.register(new DateTruncFunction(new FunctionInfo(
new FunctionIdent(NAME, ImmutableList.<DataType>of(DataTypes.STRING, DataTypes.TIMESTAMP)),
DataTypes.TIMESTAMP)
));
module.register(new DateTruncFunction(new FunctionInfo(
new FunctionIdent(NAME, ImmutableList.<DataType>of(DataTypes.STRING, DataTypes.LONG)),
DataTypes.TIMESTAMP)
));
module.register(new DateTruncFunction(new FunctionInfo(
new FunctionIdent(NAME, ImmutableList.<DataType>of(DataTypes.STRING, DataTypes.STRING)),
DataTypes.TIMESTAMP)
));
}
private static final DateTimeZone DEFAULT_TZ = DateTimeZone.UTC;
public DateTruncFunction(FunctionInfo info) {
super(info);
}
@Override
public Symbol normalizeSymbol(Function symbol) {
assert (symbol.arguments().size() == 2);
Literal interval = (Literal) symbol.arguments().get(0);
isValidInterval(interval, symbol);
Symbol tsSymbol = symbol.arguments().get(1);
if (tsSymbol.symbolType().isValueSymbol()) {
return Literal.newLiteral(
DataTypes.TIMESTAMP,
evaluate((BytesRef)interval.value(), DataTypes.TIMESTAMP.value(((Input) tsSymbol).value()))
);
} else {
assert tsSymbol instanceof DataTypeSymbol;
if ( !((DataTypeSymbol) tsSymbol).valueType().equals(DataTypes.TIMESTAMP)) {
throw new IllegalArgumentException(SymbolFormatter.format(
"The argument \"%s\" given to the date_trunc function has an invalid data type",
tsSymbol));
}
}
return symbol;
}
private Long evaluate(BytesRef interval, Long value) {
if (value == null) {
return null;
}
DateTimeUnit fieldParser = DATE_FIELD_PARSERS.get(interval);
assert fieldParser != null;
return truncate(fieldParser, value, DEFAULT_TZ);
}
@Override
public final Long evaluate(Input[] args) {
assert args.length == 2;
assert args[0].value() != null;
assert args[0].value() instanceof BytesRef;
return evaluate((BytesRef)args[0].value(), (Long)args[1].value());
}
}