/**
* 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.Clause.CONDITION;
import static org.jooq.Clause.CONDITION_COMPARISON;
import static org.jooq.Comparator.EQUALS;
import static org.jooq.Comparator.IN;
import static org.jooq.Comparator.NOT_EQUALS;
import static org.jooq.Comparator.NOT_IN;
// ...
import static org.jooq.SQLDialect.H2;
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
// ...
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.impl.DSL.exists;
import static org.jooq.impl.DSL.fieldByName;
import static org.jooq.impl.DSL.notExists;
import static org.jooq.impl.DSL.row;
import static org.jooq.impl.DSL.select;
import static org.jooq.impl.Utils.DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY;
import java.util.ArrayList;
import java.util.List;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Condition;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.QuantifiedSelect;
import org.jooq.QueryPartInternal;
import org.jooq.Record;
import org.jooq.RenderContext;
import org.jooq.Row;
import org.jooq.RowN;
import org.jooq.SQLDialect;
import org.jooq.Select;
/**
* @author Lukas Eder
*/
class RowSubqueryCondition extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -1806139685201770706L;
private static final Clause[] CLAUSES = { CONDITION, CONDITION_COMPARISON };
private final Row left;
private final Select<?> right;
private final QuantifiedSelect<?> rightQuantified;
private final Comparator comparator;
RowSubqueryCondition(Row left, Select<?> right, Comparator comparator) {
this.left = left;
this.right = right;
this.rightQuantified = null;
this.comparator = comparator;
}
RowSubqueryCondition(Row left, QuantifiedSelect<?> right, Comparator comparator) {
this.left = left;
this.right = null;
this.rightQuantified = right;
this.comparator = comparator;
}
@Override
public final void accept(Context<?> ctx) {
delegate(ctx).accept(ctx);
}
@Override
public final Clause[] clauses(Context<?> ctx) {
return delegate(ctx).clauses(ctx);
}
private final QueryPartInternal delegate(Context<?> ctx) {
final Configuration configuration = ctx.configuration();
final RenderContext render = ctx instanceof RenderContext ? (RenderContext) ctx : null;
SQLDialect family = configuration.dialect().family();
// [#3505] TODO: Emulate this where it is not supported
if (rightQuantified != null) {
return new Native();
}
// [#2395] These dialects have full native support for comparison
// predicates with row value expressions and subqueries:
else if (asList(H2, HSQLDB, MARIADB, MYSQL, POSTGRES).contains(family)) {
return new Native();
}
// [#2395] These dialects have native support for = and <>
else if (
asList(H2, HSQLDB, MARIADB, MYSQL, POSTGRES).contains(family) &&
asList(EQUALS, NOT_EQUALS).contains(comparator)) {
return new Native();
}
// [#2395] These dialects have native support for IN and NOT IN
else if (
asList(H2, HSQLDB, MARIADB, MYSQL, POSTGRES).contains(family) &&
asList(IN, NOT_IN).contains(comparator)) {
return new Native();
}
// [#2395] All other configurations have to be emulated
else {
String table = render == null ? "t" : render.nextAlias();
List<String> names = new ArrayList<String>();
for (int i = 0; i < left.size(); i++) {
names.add(table + "_" + i);
}
Field<?>[] fields = new Field[names.size()];
for (int i = 0; i < fields.length; i++) {
fields[i] = fieldByName(table, names.get(i));
}
Condition condition;
switch (comparator) {
case GREATER:
condition = ((RowN) left).gt(row(fields));
break;
case GREATER_OR_EQUAL:
condition = ((RowN) left).ge(row(fields));
break;
case LESS:
condition = ((RowN) left).lt(row(fields));
break;
case LESS_OR_EQUAL:
condition = ((RowN) left).le(row(fields));
break;
case IN:
case EQUALS:
case NOT_IN:
case NOT_EQUALS:
default:
condition = ((RowN) left).eq(row(fields));
break;
}
Select<Record> subselect =
select().from(right.asTable(table, names.toArray(new String[0])))
.where(condition);
switch (comparator) {
case NOT_IN:
case NOT_EQUALS:
return (QueryPartInternal) notExists(subselect);
default:
return (QueryPartInternal) exists(subselect);
}
}
}
private class Native extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -1552476981094856727L;
@Override
public final void accept(Context<?> ctx) {
// [#2054] Quantified row value expression comparison predicates shouldn't have parentheses before ANY or ALL
boolean parentheses = rightQuantified == null;
// Some databases need extra parentheses around the RHS
boolean extraParentheses = asList().contains(ctx.configuration().dialect().family());
boolean subquery = ctx.subquery();
ctx.visit(left)
.sql(" ")
.keyword(comparator.toSQL())
.sql(" ")
.sql( parentheses ? "(" : "")
.sql(extraParentheses ? "(" : "");
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, true);
ctx.subquery(true)
.visit(right != null ? right : rightQuantified)
.subquery(subquery);
ctx.data(DATA_ROW_VALUE_EXPRESSION_PREDICATE_SUBQUERY, null);
ctx.sql(extraParentheses ? ")" : "")
.sql( parentheses ? ")" : "");
}
@Override
public final Clause[] clauses(Context<?> ctx) {
return CLAUSES;
}
}
}