org.jooq.impl.Decode Maven / Gradle / Ivy
/**
* Copyright (c) 2009-2015, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* 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.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: http://www.jooq.org/licenses
*
*
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*/
package org.jooq.impl;
import static org.jooq.impl.DSL.function;
import org.jooq.CaseConditionStep;
import org.jooq.Configuration;
import org.jooq.Field;
/**
* @author Lukas Eder
*/
class Decode extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = -7273879239726265322L;
private final Field field;
private final Field search;
private final Field result;
private final Field[] more;
public Decode(Field field, Field search, Field result, Field[] more) {
super("decode", result.getDataType(), Utils.combine(field, search, result, more));
this.field = field;
this.search = search;
this.result = result;
this.more = more;
}
@SuppressWarnings("unchecked")
@Override
final Field getFunction0(Configuration configuration) {
switch (configuration.dialect().family()) {
/* [pro] xx
xx xxxx xxx xxxxxx xxxxxxxx xxxx xxxx xxxxxxxx
xxxx xxxxx x
xxxxxx xxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
x
xxxx xxxxxxx x
xxxxxx xxxxxxxxxxxxxxxxxx xxxxxxxxxxxxxx xxxxxxxxxxxxxxxx
x
xx [/pro] */
// Other dialects simulate it with a CASE ... WHEN expression
default: {
CaseConditionStep when = DSL
.decode()
.when(field.isNotDistinctFrom(search), result);
for (int i = 0; i < more.length; i += 2) {
// search/result pair
if (i + 1 < more.length) {
when = when.when(field.isNotDistinctFrom((Field) more[i]), (Field) more[i + 1]);
}
// trailing default value
else {
return when.otherwise((Field) more[i]);
}
}
return when;
}
}
}
}