org.jooq.impl.Cast Maven / Gradle / Ivy
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* 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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* distributed under the License is distributed on an "AS IS" BASIS,
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* See the License for the specific language governing permissions and
* limitations under the License.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* 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.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_DECIMAL;
import static org.jooq.impl.Keywords.K_TRIM;
import static org.jooq.impl.SQLDataType.BOOLEAN;
import static org.jooq.impl.SQLDataType.DOUBLE;
import static org.jooq.impl.SQLDataType.FLOAT;
import static org.jooq.impl.SQLDataType.REAL;
import static org.jooq.impl.SQLDataType.VARCHAR;
import java.sql.Date;
import java.sql.Time;
import java.sql.Timestamp;
import org.jooq.Clause;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.Field;
import org.jooq.QueryPart;
import org.jooq.RenderContext.CastMode;
/**
* @author Lukas Eder
*/
final class Cast extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = -6776617606751542856L;
private final Field field;
public Cast(Field field, DataType type) {
super("cast", type);
this.field = field;
}
private final DataType getSQLDataType() {
return getDataType().getSQLDataType();
}
@Override
final QueryPart getFunction0(Configuration configuration) {
switch (configuration.dialect().family()) {
case DERBY:
return new CastDerby();
default:
return new Native();
}
}
private class CastDerby extends Native {
/**
* Generated UID
*/
private static final long serialVersionUID = -8737153188122391258L;
@SuppressWarnings("unchecked")
private final Field asDecodeNumberToBoolean() {
// [#859] 0 => false, null => null, all else is true
return DSL.choose((Field) field)
.when(inline(0), inline(false))
.when(inline((Integer) null), inline((Boolean) null))
.otherwise(inline(true));
}
@SuppressWarnings("unchecked")
private final Field asDecodeVarcharToBoolean() {
Field s = (Field) field;
// [#859] '0', 'f', 'false' => false, null => null, all else is true
return DSL.when(s.equal(inline("0")), inline(false))
.when(DSL.lower(s).equal(inline("false")), inline(false))
.when(DSL.lower(s).equal(inline("f")), inline(false))
.when(s.isNull(), inline((Boolean) null))
.otherwise(inline(true));
}
@Override
public final void accept(Context ctx) {
// Avoid casting bind values inside an explicit cast...
CastMode castMode = ctx.castMode();
// [#857] Interestingly, Derby does not allow for casting numeric
// types directly to VARCHAR. An intermediary cast to CHAR is needed
if (field.getDataType().isNumeric() &&
VARCHAR.equals(getSQLDataType())) {
ctx.visit(K_TRIM).sql('(')
.visit(K_CAST).sql('(')
.visit(K_CAST).sql('(')
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(' ').visit(K_AS).sql(" char(38))")
.sql(' ').visit(K_AS).sql(' ')
.sql(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql("))");
return;
}
// [#888] ... neither does casting character types to FLOAT (and similar)
else if (field.getDataType().isString() &&
asList(FLOAT, DOUBLE, REAL).contains(getSQLDataType())) {
ctx.visit(K_CAST).sql('(')
.visit(K_CAST).sql('(')
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(' ').visit(K_AS).sql(' ').visit(K_DECIMAL)
.sql(") ")
.visit(K_AS)
.sql(' ')
.sql(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql(')');
return;
}
// [#859] ... neither does casting numeric types to BOOLEAN
else if (field.getDataType().isNumeric() &&
BOOLEAN.equals(getSQLDataType())) {
ctx.visit(asDecodeNumberToBoolean());
return;
}
// [#859] ... neither does casting character types to BOOLEAN
else if (field.getDataType().isString() &&
BOOLEAN.equals(getSQLDataType())) {
ctx.visit(asDecodeVarcharToBoolean());
return;
}
super.accept(ctx);
}
}
private class Native extends AbstractQueryPart {
/**
* Generated UID
*/
private static final long serialVersionUID = -8497561014419483312L;
@Override
public void accept(Context ctx) {
// Avoid casting bind values inside an explicit cast...
CastMode castMode = ctx.castMode();
// Default rendering, if no special case has applied yet
ctx.visit(K_CAST).sql('(')
.castMode(CastMode.NEVER)
.visit(field)
.castMode(castMode)
.sql(' ').visit(K_AS).sql(' ')
.sql(getDataType(ctx.configuration()).getCastTypeName(ctx.configuration()))
.sql(')');
}
@Override
public final Clause[] clauses(Context ctx) {
return null;
}
}
}