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/**
* 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 java.util.Arrays.asList;
import static org.jooq.Comparator.IS_DISTINCT_FROM;
// ...
// ...
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.DERBY;
// ...
// ...
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
// ...
import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
import static org.jooq.impl.DSL.condition;
import static org.jooq.impl.DSL.decode;
import static org.jooq.impl.DSL.exists;
import static org.jooq.impl.DSL.notExists;
import static org.jooq.impl.DSL.one;
import static org.jooq.impl.DSL.select;
import static org.jooq.impl.DSL.zero;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.QueryPartInternal;
import org.jooq.SQLDialect;
/**
* @author Lukas Eder
*/
class IsDistinctFrom extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = 4568269684824736461L;
private final Field lhs;
private final Field rhs;
private final Comparator comparator;
private transient QueryPartInternal mySQLCondition;
private transient QueryPartInternal sqliteCondition;
private transient QueryPartInternal compareCondition;
private transient QueryPartInternal caseExpression;
IsDistinctFrom(Field lhs, Field rhs, Comparator comparator) {
this.lhs = lhs;
this.rhs = rhs;
this.comparator = comparator;
}
@Override
public final void accept(Context ctx) {
delegate(ctx.configuration()).accept(ctx);
}
@Override
public final Clause[] clauses(Context ctx) {
return delegate(ctx.configuration()).clauses(ctx);
}
/**
* Get a delegate CompareCondition, in case the context
* {@link SQLDialect} natively supports the IS DISTINCT FROM
* clause.
*/
private final QueryPartInternal delegate(Configuration configuration) {
// [#3511] These dialects need to emulate the IS DISTINCT FROM predicate, optimally using INTERSECT...
if (asList(CUBRID, DERBY).contains(configuration.dialect().family())) {
return (comparator == IS_DISTINCT_FROM)
? (QueryPartInternal) notExists(select(lhs).intersect(select(rhs)))
: (QueryPartInternal) exists(select(lhs).intersect(select(rhs)));
}
// ... or using a more verbose CASE expression
else if (asList().contains(configuration.dialect().family())) {
if (caseExpression == null) {
if (comparator == Comparator.IS_DISTINCT_FROM) {
caseExpression = (QueryPartInternal) decode()
.when(lhs.isNull().and(rhs.isNull()), zero())
.when(lhs.isNull().and(rhs.isNotNull()), one())
.when(lhs.isNotNull().and(rhs.isNull()), one())
.when(lhs.equal(rhs), zero())
.otherwise(one())
.equal(one());
}
else {
caseExpression = (QueryPartInternal) decode()
.when(lhs.isNull().and(rhs.isNull()), one())
.when(lhs.isNull().and(rhs.isNotNull()), zero())
.when(lhs.isNotNull().and(rhs.isNull()), zero())
.when(lhs.equal(rhs), one())
.otherwise(zero())
.equal(one());
}
}
return caseExpression;
}
// MySQL knows the <=> operator
else if (asList(MARIADB, MYSQL).contains(configuration.dialect())) {
if (mySQLCondition == null) {
if (comparator == IS_DISTINCT_FROM) {
mySQLCondition = (QueryPartInternal) condition("{not}({0} <=> {1})", lhs, rhs);
}
else {
mySQLCondition = (QueryPartInternal) condition("{0} <=> {1}", lhs, rhs);
}
}
return mySQLCondition;
}
// SQLite knows the IS / IS NOT predicate
else if (SQLITE == configuration.dialect()) {
if (sqliteCondition == null) {
if (comparator == IS_DISTINCT_FROM) {
sqliteCondition = (QueryPartInternal) condition("{0} {is not} {1}", lhs, rhs);
}
else {
sqliteCondition = (QueryPartInternal) condition("{0} {is} {1}", lhs, rhs);
}
}
return sqliteCondition;
}
// These dialects natively support the IS DISTINCT FROM predicate:
// H2, Postgres
else {
if (compareCondition == null) {
compareCondition = new CompareCondition(lhs, rhs, comparator);
}
return compareCondition;
}
}
}
