org.jooq.impl.Round Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2014, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* This work is dual-licensed
* - under the Apache Software License 2.0 (the "ASL")
* - under the jOOQ License and Maintenance Agreement (the "jOOQ License")
* =============================================================================
* You may choose which license applies to you:
*
* - If you're using this work with Open Source databases, you may choose
* either ASL or jOOQ License.
* - If you're using this work with at least one commercial database, you must
* choose jOOQ License
*
* For more information, please visit http://www.jooq.org/licenses
*
* Apache Software License 2.0:
* -----------------------------------------------------------------------------
* Licensed 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.
*
* jOOQ License and Maintenance Agreement:
* -----------------------------------------------------------------------------
* Data Geekery grants the Customer the non-exclusive, timely limited and
* non-transferable license to install and use the Software under the terms of
* the jOOQ License and Maintenance Agreement.
*
* This library is distributed with a LIMITED WARRANTY. See the jOOQ License
* and Maintenance Agreement for more details: http://www.jooq.org/licensing
*/
package org.jooq.impl;
import static org.jooq.impl.DSL.function;
import static org.jooq.impl.DSL.val;
import java.math.BigDecimal;
import org.jooq.Configuration;
import org.jooq.Field;
/**
* @author Lukas Eder
*/
class Round extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = -7273879239726265322L;
private final Field argument;
private final int decimals;
Round(Field argument) {
this(argument, 0);
}
Round(Field argument, int decimals) {
super("round", argument.getDataType(), argument);
this.argument = argument;
this.decimals = decimals;
}
@SuppressWarnings("unchecked")
@Override
final Field getFunction0(Configuration configuration) {
switch (configuration.dialect().family()) {
// evaluate "round" if unavailable
case DERBY: {
if (decimals == 0) {
return DSL.decode()
.when(argument.sub(DSL.floor(argument))
.lessThan((T) Double.valueOf(0.5)), DSL.floor(argument))
.otherwise(DSL.ceil(argument));
}
else {
Field factor = DSL.val(BigDecimal.ONE.movePointRight(decimals));
Field mul = argument.mul(factor);
return DSL.decode()
.when(mul.sub(DSL.floor(mul))
.lessThan((T) Double.valueOf(0.5)), DSL.floor(mul).div(factor))
.otherwise(DSL.ceil(mul).div(factor));
}
}
/* [pro] xx
xx xxxxx xxxxxxxx xxxx x xxxxxxxxx xxxxxxxx xxxxxxxx
xxxx xxxx
xxxx xxxxxxx
xxxx xxxxxxxxxx
xxxx xxxxxxx x
xxxxxx xxxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxxxxx xxxxxxxxxxxxxxx
x
xx [/pro] */
// There's no function round(double precision, integer) in Postgres
case POSTGRES: {
if (decimals == 0) {
return function("round", getDataType(), argument);
}
else {
return function("round", getDataType(), argument.cast(BigDecimal.class), val(decimals));
}
}
// This is the optimal implementation by most RDBMS
default: {
if (decimals == 0) {
return function("round", getDataType(), argument);
}
else {
return function("round", getDataType(), argument, val(decimals));
}
}
}
}
}