/**
* 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.GREATER;
import static org.jooq.Comparator.GREATER_OR_EQUAL;
import static org.jooq.Comparator.LESS;
import static org.jooq.Comparator.LESS_OR_EQUAL;
import static org.jooq.Comparator.NOT_EQUALS;
// ...
// ...
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.DERBY;
import static org.jooq.SQLDialect.FIREBIRD;
// ...
// ...
// ...
import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
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.Operator;
import org.jooq.QueryPartInternal;
import org.jooq.Row;
import org.jooq.SQLDialect;
/**
* @author Lukas Eder
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
class RowCondition extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -1806139685201770706L;
private static final Clause[] CLAUSES = { CONDITION, CONDITION_COMPARISON };
private final Row left;
private final Row right;
private final Comparator comparator;
RowCondition(Row left, Row right, Comparator comparator) {
this.left = left;
this.right = right;
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);
}
private final QueryPartInternal delegate(Configuration configuration) {
SQLDialect dialect = configuration.dialect();
// Regular comparison predicate simulation
if (asList(EQUALS, NOT_EQUALS).contains(comparator) &&
asList(DERBY, FIREBIRD, SQLITE).contains(dialect.family())) {
List<Condition> conditions = new ArrayList<Condition>();
Field<?>[] leftFields = left.fields();
Field<?>[] rightFields = right.fields();
for (int i = 0; i < leftFields.length; i++) {
conditions.add(leftFields[i].equal((Field) rightFields[i]));
}
Condition result = new CombinedCondition(Operator.AND, conditions);
if (comparator == NOT_EQUALS) {
result = result.not();
}
return (QueryPartInternal) result;
}
// Ordering comparison predicate simulation
else if (asList(GREATER, GREATER_OR_EQUAL, LESS, LESS_OR_EQUAL).contains(comparator) &&
asList(DERBY, CUBRID, FIREBIRD, SQLITE).contains(dialect.family())) {
// The order component of the comparator (stripping the equal component)
Comparator order
= (comparator == GREATER) ? GREATER
: (comparator == GREATER_OR_EQUAL) ? GREATER
: (comparator == LESS) ? LESS
: (comparator == LESS_OR_EQUAL) ? LESS
: null;
// [#2658] The factored order component of the comparator (enforcing the equal component)
Comparator factoredOrder
= (comparator == GREATER) ? GREATER_OR_EQUAL
: (comparator == GREATER_OR_EQUAL) ? GREATER_OR_EQUAL
: (comparator == LESS) ? LESS_OR_EQUAL
: (comparator == LESS_OR_EQUAL) ? LESS_OR_EQUAL
: null;
// Whether the comparator has an equal component
boolean equal
= (comparator == GREATER_OR_EQUAL)
||(comparator == LESS_OR_EQUAL);
// The following algorithm simulates the equivalency of these expressions:
// (A, B, C) > (X, Y, Z)
// (A > X) OR (A = X AND B > Y) OR (A = X AND B = Y AND C > Z)
List<Condition> outer = new ArrayList<Condition>();
Field<?>[] leftFields = left.fields();
Field<?>[] rightFields = right.fields();
for (int i = 0; i < leftFields.length; i++) {
List<Condition> inner = new ArrayList<Condition>();
for (int j = 0; j < i; j++) {
inner.add(leftFields[j].equal((Field) rightFields[j]));
}
inner.add(leftFields[i].compare(order, (Field) rightFields[i]));
outer.add(new CombinedCondition(Operator.AND, inner));
}
if (equal) {
outer.add(new RowCondition(left, right, Comparator.EQUALS));
}
Condition result = new CombinedCondition(Operator.OR, outer);
// [#2658] For performance reasons, an additional, redundant
// predicate is factored out to favour the application of range
// scans as the topmost predicate is AND-connected, not
// OR-connected:
// (A, B, C) > (X, Y, Z)
// (A >= X) AND ((A > X) OR (A = X AND B > Y) OR (A = X AND B = Y AND C > Z))
if (leftFields.length > 1) {
result = leftFields[0].compare(factoredOrder, (Field) rightFields[0]).and(result);
}
return (QueryPartInternal) result;
}
else {
return new Native();
}
}
private class Native extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = -2977241780111574353L;
@Override
public final void accept(Context<?> ctx) {
// Some dialects do not support != comparison with rows
if (comparator == NOT_EQUALS && asList().contains(ctx.configuration().dialect().family())) {
ctx.keyword("not").sql("(")
.visit(left).sql(" = ").visit(right)
.sql(")");
}
else {
// Some databases need extra parentheses around the RHS
boolean extraParentheses = asList().contains(ctx.configuration().dialect().family());
ctx.visit(left)
.sql(" ")
.sql(comparator.toSQL())
.sql(" ")
.sql(extraParentheses ? "(" : "")
.visit(right)
.sql(extraParentheses ? ")" : "");
}
}
@Override
public final Clause[] clauses(Context<?> ctx) {
return CLAUSES;
}
}
}