/**
* 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.LIKE;
import static org.jooq.Comparator.LIKE_IGNORE_CASE;
import static org.jooq.Comparator.NOT_LIKE;
import static org.jooq.Comparator.NOT_LIKE_IGNORE_CASE;
// ...
// ...
import static org.jooq.SQLDialect.DERBY;
// ...
import static org.jooq.SQLDialect.POSTGRES;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.SQLDialect;
/**
* @author Lukas Eder
*/
class CompareCondition extends AbstractCondition {
private static final long serialVersionUID = -747240442279619486L;
private static final Clause[] CLAUSES = { CONDITION, CONDITION_COMPARISON };
private final Field<?> field1;
private final Field<?> field2;
private final Comparator comparator;
private final Character escape;
CompareCondition(Field<?> field1, Field<?> field2, Comparator comparator) {
this(field1, field2, comparator, null);
}
CompareCondition(Field<?> field1, Field<?> field2, Comparator comparator, Character escape) {
this.field1 = field1;
this.field2 = field2;
this.comparator = comparator;
this.escape = escape;
}
@Override
public final void accept(Context<?> ctx) {
SQLDialect family = ctx.configuration().dialect().family();
Field<?> lhs = field1;
Field<?> rhs = field2;
Comparator op = comparator;
// [#1159] Some dialects cannot auto-convert the LHS operand to a
// VARCHAR when applying a LIKE predicate
// [#293] TODO: This could apply to other operators, too
if ((op == LIKE || op == NOT_LIKE)
&& field1.getType() != String.class
&& asList(DERBY, POSTGRES).contains(family)) {
lhs = lhs.cast(String.class);
}
// [#1423] Only Postgres knows a true ILIKE operator. Other dialects
// need to simulate this as LOWER(lhs) LIKE LOWER(rhs)
else if ((op == LIKE_IGNORE_CASE || op == NOT_LIKE_IGNORE_CASE)
&& POSTGRES != family) {
lhs = lhs.lower();
rhs = rhs.lower();
op = (op == LIKE_IGNORE_CASE ? LIKE : NOT_LIKE);
}
ctx.visit(lhs)
.sql(" ");
boolean castRhs = false;
/* [pro] xx
xx xxxxxxx xxxx xxxxx xxx xxxxx xxxxx xxxxxx xxxx xxxxxxx xxxx x
xx xxxxxxxxxxxx xxxxxx xxxxxxxxxxx xx xxx xxxxxxxxxx xx xxxx xxxx xxxx
xx xxxxxxxxxx xxxx
xx xxxxxxx xx xxx xx xxx xxxxxxxxxx xxxxxxx
xxxxxxx x xxxxx
xx [/pro] */
ctx.keyword(op.toSQL()).sql(" ");
if (castRhs) ctx.keyword("cast").sql("(");
ctx.visit(rhs);
if (castRhs) ctx.sql(" ").keyword("as").sql(" ").keyword("varchar").sql("(4000))");
if (escape != null) {
ctx.sql(" ").keyword("escape").sql(" '")
.sql(escape)
.sql("'");
}
}
@Override
public final Clause[] clauses(Context<?> ctx) {
return CLAUSES;
}
}