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/*
* Copyright (c) 2009-2016, Data Geekery GmbH (http://www.datageekery.com)
* All rights reserved.
*
* 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.
*
* 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.
*
* For more information, please visit: http://www.jooq.org/licenses
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*
*/
package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.DatePart.MONTH;
import static org.jooq.DatePart.SECOND;
// ...
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.FIREBIRD;
import static org.jooq.SQLDialect.H2;
import static org.jooq.SQLDialect.HSQLDB;
// ...
// ...
// ...
import static org.jooq.SQLDialect.POSTGRES;
// ...
import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
// ...
import static org.jooq.impl.DSL.function;
import static org.jooq.impl.DSL.inline;
import static org.jooq.impl.DSL.two;
import static org.jooq.impl.DSL.val;
import static org.jooq.impl.ExpressionOperator.ADD;
import static org.jooq.impl.ExpressionOperator.BIT_AND;
import static org.jooq.impl.ExpressionOperator.BIT_NAND;
import static org.jooq.impl.ExpressionOperator.BIT_NOR;
import static org.jooq.impl.ExpressionOperator.BIT_OR;
import static org.jooq.impl.ExpressionOperator.BIT_XNOR;
import static org.jooq.impl.ExpressionOperator.BIT_XOR;
import static org.jooq.impl.ExpressionOperator.SHL;
import static org.jooq.impl.ExpressionOperator.SHR;
import static org.jooq.impl.ExpressionOperator.SUBTRACT;
import java.sql.Timestamp;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.DatePart;
import org.jooq.Field;
import org.jooq.Param;
import org.jooq.SQLDialect;
import org.jooq.exception.DataTypeException;
import org.jooq.exception.SQLDialectNotSupportedException;
import org.jooq.types.DayToSecond;
import org.jooq.types.Interval;
import org.jooq.types.YearToMonth;
final class Expression extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = -5522799070693019771L;
private final Field lhs;
private final QueryPartList> rhs;
private final ExpressionOperator operator;
Expression(ExpressionOperator operator, Field lhs, Field... rhs) {
super(operator.toSQL(), lhs.getDataType(), Tools.combine(lhs, rhs));
this.operator = operator;
this.lhs = lhs;
this.rhs = new QueryPartList>(rhs);
}
@Override
public final Field add(Field value) {
if (operator == ExpressionOperator.ADD) {
rhs.add(value);
return this;
}
return super.add(value);
}
@Override
public final Field mul(Field value) {
if (operator == ExpressionOperator.MULTIPLY) {
rhs.add(value);
return this;
}
return super.mul(value);
}
@SuppressWarnings("unchecked")
@Override
final Field getFunction0(Configuration configuration) {
SQLDialect family = configuration.dialect().family();
// ---------------------------------------------------------------------
// XXX: Bitwise operators
// ---------------------------------------------------------------------
// DB2, H2 and HSQLDB know functions, instead of operators
if (BIT_AND == operator && asList(H2, HSQLDB).contains(family)) {
return function("bitand", getDataType(), getArguments());
}
else if (BIT_AND == operator && FIREBIRD == family) {
return function("bin_and", getDataType(), getArguments());
}
else if (BIT_XOR == operator && asList(H2, HSQLDB).contains(family)) {
return function("bitxor", getDataType(), getArguments());
}
else if (BIT_XOR == operator && FIREBIRD == family) {
return function("bin_xor", getDataType(), getArguments());
}
else if (BIT_OR == operator && asList(H2, HSQLDB).contains(family)) {
return function("bitor", getDataType(), getArguments());
}
else if (BIT_OR == operator && FIREBIRD == family) {
return function("bin_or", getDataType(), getArguments());
}
// ~(a & b) & (a | b)
else if (BIT_XOR == operator && asList(SQLITE).contains(family)) {
return (Field) DSL.bitAnd(
DSL.bitNot(DSL.bitAnd(lhsAsNumber(), rhsAsNumber())),
DSL.bitOr(lhsAsNumber(), rhsAsNumber()));
}
// Many dialects don't support shifts. Use multiplication/division instead
else if (SHL == operator && asList(H2, HSQLDB).contains(family)) {
return lhs.mul((Field) DSL.power(two(), rhsAsNumber()).cast(lhs));
}
// [#3962] This emulation is expensive. If this is emulated, BitCount should
// use division instead of SHR directly
else if (SHR == operator && asList(H2, HSQLDB).contains(family)) {
return lhs.div((Field) DSL.power(two(), rhsAsNumber()).cast(lhs));
}
// Some dialects support shifts as functions
else if (SHL == operator && FIREBIRD == family) {
return function("bin_shl", getDataType(), getArguments());
}
else if (SHR == operator && FIREBIRD == family) {
return function("bin_shr", getDataType(), getArguments());
}
// These operators are not supported in any dialect
else if (BIT_NAND == operator) {
return (Field) DSL.bitNot(DSL.bitAnd(lhsAsNumber(), rhsAsNumber()));
}
else if (BIT_NOR == operator) {
return (Field) DSL.bitNot(DSL.bitOr(lhsAsNumber(), rhsAsNumber()));
}
else if (BIT_XNOR == operator) {
return (Field) DSL.bitNot(DSL.bitXor(lhsAsNumber(), rhsAsNumber()));
}
// ---------------------------------------------------------------------
// XXX: Date time arithmetic operators
// ---------------------------------------------------------------------
// [#585] Date time arithmetic for numeric or interval RHS
else if (asList(ADD, SUBTRACT).contains(operator) &&
lhs.getDataType().isDateTime() &&
(rhs.get(0).getDataType().isNumeric() ||
rhs.get(0).getDataType().isInterval())) {
return new DateExpression();
}
// ---------------------------------------------------------------------
// XXX: Other operators
// ---------------------------------------------------------------------
// Use the default operator expression for all other cases
else {
return new DefaultExpression();
}
}
/**
* In some expressions, the lhs can be safely assumed to be a single number
*/
@SuppressWarnings("unchecked")
private final Field lhsAsNumber() {
return (Field) lhs;
}
/**
* In some expressions, the rhs can be safely assumed to be a single number
*/
@SuppressWarnings("unchecked")
private final Field rhsAsNumber() {
return (Field) rhs.get(0);
}
@SuppressWarnings("unchecked")
private final YearToMonth rhsAsYTM() {
try {
return ((Param) rhs.get(0)).getValue();
}
catch (ClassCastException e) {
throw new DataTypeException("Cannot perform datetime arithmetic with a non-numeric, non-interval data type on the right hand side of the expression: " + rhs.get(0));
}
}
@SuppressWarnings("unchecked")
private final DayToSecond rhsAsDTS() {
try {
return ((Param) rhs.get(0)).getValue();
}
catch (ClassCastException e) {
throw new DataTypeException("Cannot perform datetime arithmetic with a non-numeric, non-interval data type on the right hand side of the expression: " + rhs.get(0));
}
}
@SuppressWarnings("unchecked")
private final Interval rhsAsInterval() {
try {
return ((Param) rhs.get(0)).getValue();
}
catch (ClassCastException e) {
throw new DataTypeException("Cannot perform datetime arithmetic with a non-numeric, non-interval data type on the right hand side of the expression: " + rhs.get(0));
}
}
private class DateExpression extends AbstractFunction {
/**
* Generated UID
*/
private static final long serialVersionUID = 3160679741902222262L;
DateExpression() {
super(operator.toSQL(), lhs.getDataType());
}
@Override
final Field getFunction0(Configuration configuration) {
if (rhs.get(0).getDataType().isInterval()) {
return getIntervalExpression(configuration);
}
else {
return getNumberExpression(configuration);
}
}
/**
* Return the expression to be rendered when the RHS is an interval type
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
private final Field getIntervalExpression(Configuration configuration) {
SQLDialect dialect = configuration.dialect();
int sign = (operator == ADD) ? 1 : -1;
switch (dialect.family()) {
case CUBRID:
case MARIADB:
case MYSQL: {
Interval interval = rhsAsInterval();
if (operator == SUBTRACT) {
interval = interval.neg();
}
if (rhs.get(0).getType() == YearToMonth.class) {
return DSL.field("{date_add}({0}, {interval} {1} {year_month})", getDataType(), lhs, Tools.field(interval, String.class));
}
else {
if (dialect == CUBRID) {
return DSL.field("{date_add}({0}, {interval} {1} {day_millisecond})", getDataType(), lhs, Tools.field(interval, String.class));
}
else {
return DSL.field("{date_add}({0}, {interval} {1} {day_microsecond})", getDataType(), lhs, Tools.field(interval, String.class));
}
}
}
case DERBY:
case HSQLDB: {
Field result;
if (rhs.get(0).getType() == YearToMonth.class) {
result = DSL.field("{fn {timestampadd}({sql_tsi_month}, {0}, {1}) }",
getDataType(), val(sign * rhsAsYTM().intValue()), lhs);
}
else {
result = DSL.field("{fn {timestampadd}({sql_tsi_second}, {0}, {1}) }",
getDataType(), val(sign * (long) rhsAsDTS().getTotalSeconds()), lhs);
}
// [#1883] TIMESTAMPADD returns TIMESTAMP columns. If this
// is a DATE column, cast it to DATE
return castNonTimestamps(configuration, result);
}
case FIREBIRD: {
if (rhs.get(0).getType() == YearToMonth.class) {
return DSL.field("{dateadd}({month}, {0}, {1})", getDataType(), val(sign * rhsAsYTM().intValue()), lhs);
}
else {
return DSL.field("{dateadd}({millisecond}, {0}, {1})", getDataType(), val(sign * (long) rhsAsDTS().getTotalMilli()), lhs);
}
}
case H2: {
if (rhs.get(0).getType() == YearToMonth.class) {
return DSL.field("{dateadd}('month', {0}, {1})", getDataType(), val(sign * rhsAsYTM().intValue()), lhs);
}
else {
return DSL.field("{dateadd}('ms', {0}, {1})", getDataType(), val(sign * (long) rhsAsDTS().getTotalMilli()), lhs);
}
}
case SQLITE: {
boolean ytm = rhs.get(0).getType() == YearToMonth.class;
Field interval = val(ytm ? rhsAsYTM().intValue() : rhsAsDTS().getTotalSeconds());
if (sign < 0) {
interval = interval.neg();
}
interval = interval.concat(inline(ytm ? " months" : " seconds"));
return DSL.field("{datetime}({0}, {1})", getDataType(), lhs, interval);
}
case POSTGRES:
default:
return new DefaultExpression();
}
}
/**
* Cast a field to its actual type if it is not a TIMESTAMP
* field
*/
private final Field castNonTimestamps(Configuration configuration, Field result) {
if (getDataType().getType() != Timestamp.class) {
return DSL.field("{cast}({0} {as} " + getDataType().getCastTypeName(configuration) + ")", getDataType(), result);
}
return result;
}
/**
* Return the expression to be rendered when the RHS is a number type
*/
@SuppressWarnings({ "unchecked", "rawtypes" })
private final Field getNumberExpression(Configuration configuration) {
switch (configuration.family()) {
case FIREBIRD: {
if (operator == ADD) {
return DSL.field("{dateadd}(day, {0}, {1})", getDataType(), rhsAsNumber(), lhs);
}
else {
return DSL.field("{dateadd}(day, {0}, {1})", getDataType(), rhsAsNumber().neg(), lhs);
}
}
case HSQLDB: {
if (operator == ADD) {
return lhs.add(DSL.field("{0} day", rhsAsNumber()));
}
else {
return lhs.sub(DSL.field("{0} day", rhsAsNumber()));
}
}
case DERBY: {
Field result;
if (operator == ADD) {
result = DSL.field("{fn {timestampadd}({sql_tsi_day}, {0}, {1}) }", getDataType(), rhsAsNumber(), lhs);
}
else {
result = DSL.field("{fn {timestampadd}({sql_tsi_day}, {0}, {1}) }", getDataType(), rhsAsNumber().neg(), lhs);
}
// [#1883] TIMESTAMPADD returns TIMESTAMP columns. If this
// is a DATE column, cast it to DATE
return castNonTimestamps(configuration, result);
}
case CUBRID:
case MARIADB:
case MYSQL: {
if (operator == ADD) {
return DSL.field("{date_add}({0}, {interval} {1} {day})", getDataType(), lhs, rhsAsNumber());
}
else {
return DSL.field("{date_add}({0}, {interval} {1} {day})", getDataType(), lhs, rhsAsNumber().neg());
}
}
case POSTGRES: {
// This seems to be the most reliable way to avoid issues
// with incompatible data types and timezones
// ? + CAST (? || ' days' as interval)
if (operator == ADD) {
return new DateAdd(lhs, rhsAsNumber(), DatePart.DAY);
}
else {
return new DateAdd(lhs, rhsAsNumber().neg(), DatePart.DAY);
}
}
case SQLITE:
if (operator == ADD) {
return DSL.field("{datetime}({0}, {1})", getDataType(), lhs, rhsAsNumber().concat(inline(" day")));
}
else {
return DSL.field("{datetime}({0}, {1})", getDataType(), lhs, rhsAsNumber().neg().concat(inline(" day")));
}
// These dialects can add / subtract days using +/- operators
case H2:
default:
return new DefaultExpression();
}
}
}
private class DefaultExpression extends AbstractField {
/**
* Generated UID
*/
private static final long serialVersionUID = -5105004317793995419L;
private DefaultExpression() {
super(operator.toSQL(), lhs.getDataType());
}
@Override
public final void accept(Context ctx) {
String op = operator.toSQL();
if (operator == BIT_XOR && asList(POSTGRES).contains(ctx.family())) {
op = "#";
}
ctx.sql('(');
ctx.visit(lhs);
for (Field field : rhs) {
ctx.sql(' ')
.sql(op)
.sql(' ')
.visit(field);
}
ctx.sql(')');
}
}
}