/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
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* limitations under the License.
*
* Other licenses:
* -----------------------------------------------------------------------------
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* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
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* For more information, please visit: http://www.jooq.org/licenses
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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 static org.jooq.conf.ParamType.INLINED;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.Keywords.K_AS;
import static org.jooq.impl.Keywords.K_CAST;
import static org.jooq.impl.Keywords.K_ESCAPE;
import static org.jooq.impl.Keywords.K_VARCHAR;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Condition;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.LikeEscapeStep;
import org.jooq.SQLDialect;
import org.jooq.conf.ParamType;
/**
* @author Lukas Eder
*/
final class CompareCondition extends AbstractCondition implements LikeEscapeStep {
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 Character escape;
CompareCondition(Field<?> field1, Field<?> field2, Comparator comparator) {
this.field1 = field1;
this.field2 = field2;
this.comparator = comparator;
}
@Override
public final Condition escape(char c) {
this.escape = c;
return this;
}
@Override
public final void accept(Context<?> ctx) {
SQLDialect family = ctx.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 emulate 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;
ParamType previousParamType = ctx.paramType();
ParamType forcedParamType = previousParamType;
ctx.visit(op.toKeyword()).sql(' ');
if (castRhs) ctx.visit(K_CAST).sql('(');
ctx.paramType(forcedParamType)
.visit(rhs)
.paramType(previousParamType);
if (castRhs) ctx.sql(' ').visit(K_AS).sql(' ').visit(K_VARCHAR).sql("(4000))");
if (escape != null) {
ctx.sql(' ').visit(K_ESCAPE).sql(' ')
.visit(inline(escape));
}
}
@Override
public final Clause[] clauses(Context<?> ctx) {
return CLAUSES;
}
}