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org.jooq.impl.Function Maven / Gradle / Ivy
/**
* 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
*
*
*
*
*
*
*
*
*
*
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*
*
*
*
*
*/
package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.H2;
import static org.jooq.SQLDialect.HSQLDB;
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
import static org.jooq.SQLDialect.POSTGRES;
import static org.jooq.SQLDialect.POSTGRES_9_4;
// ...
import static org.jooq.impl.DSL.condition;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.one;
import static org.jooq.impl.DSL.percentileCont;
import static org.jooq.impl.Term.ARRAY_AGG;
import static org.jooq.impl.Term.LIST_AGG;
import static org.jooq.impl.Term.MEDIAN;
import static org.jooq.impl.Term.ROW_NUMBER;
import static org.jooq.impl.Tools.DataKey.DATA_LOCALLY_SCOPED_DATA_MAP;
import static org.jooq.impl.Tools.DataKey.DATA_WINDOW_DEFINITIONS;
import java.math.BigDecimal;
import java.util.Arrays;
import java.util.Collection;
import java.util.Map;
import org.jooq.AggregateFilterStep;
import org.jooq.AggregateFunction;
import org.jooq.ArrayAggOrderByStep;
import org.jooq.Condition;
import org.jooq.Context;
import org.jooq.DataType;
import org.jooq.Field;
import org.jooq.Name;
import org.jooq.OrderedAggregateFunction;
import org.jooq.QueryPart;
import org.jooq.SQL;
import org.jooq.SQLDialect;
import org.jooq.SortField;
import org.jooq.WindowBeforeOverStep;
import org.jooq.WindowDefinition;
import org.jooq.WindowFinalStep;
import org.jooq.WindowIgnoreNullsStep;
import org.jooq.WindowOrderByStep;
import org.jooq.WindowOverStep;
import org.jooq.WindowPartitionByStep;
import org.jooq.WindowRowsAndStep;
import org.jooq.WindowRowsStep;
import org.jooq.WindowSpecification;
// ...
/**
* A field that handles built-in functions, aggregate functions, and window
* functions.
*
* @author Lukas Eder
*/
class Function extends AbstractField implements
// Cascading interface implementations for aggregate function behaviour
OrderedAggregateFunction,
ArrayAggOrderByStep,
AggregateFunction,
// and for window function behaviour
WindowIgnoreNullsStep,
WindowPartitionByStep,
WindowRowsStep,
WindowRowsAndStep
{
private static final long serialVersionUID = 347252741712134044L;
static final Field ASTERISK = DSL.field("*", Integer.class);
// Mutually exclusive attributes: super.getName(), this.name, this.term
private final Name name;
private final Term term;
// Other attributes
private final QueryPartList arguments;
private final boolean distinct;
private final SortFieldList withinGroupOrderBy;
private final SortFieldList keepDenseRankOrderBy;
private Condition filter;
private WindowSpecificationImpl windowSpecification;
private WindowDefinitionImpl windowDefinition;
private Name windowName;
private boolean first;
private boolean ignoreNulls;
private boolean respectNulls;
// -------------------------------------------------------------------------
// XXX Constructors
// -------------------------------------------------------------------------
Function(String name, DataType type, QueryPart... arguments) {
this(name, false, type, arguments);
}
Function(Term term, DataType type, QueryPart... arguments) {
this(term, false, type, arguments);
}
Function(Name name, DataType type, QueryPart... arguments) {
this(name, false, type, arguments);
}
Function(String name, boolean distinct, DataType type, QueryPart... arguments) {
super(name, type);
this.term = null;
this.name = null;
this.distinct = distinct;
this.arguments = new QueryPartList(arguments);
this.keepDenseRankOrderBy = new SortFieldList();
this.withinGroupOrderBy = new SortFieldList();
}
Function(Term term, boolean distinct, DataType type, QueryPart... arguments) {
super(term.name().toLowerCase(), type);
this.term = term;
this.name = null;
this.distinct = distinct;
this.arguments = new QueryPartList(arguments);
this.keepDenseRankOrderBy = new SortFieldList();
this.withinGroupOrderBy = new SortFieldList();
}
Function(Name name, boolean distinct, DataType type, QueryPart... arguments) {
super(last(name.getName()), type);
this.term = null;
this.name = name;
this.distinct = distinct;
this.arguments = new QueryPartList(arguments);
this.keepDenseRankOrderBy = new SortFieldList();
this.withinGroupOrderBy = new SortFieldList();
}
final static String last(String... strings) {
if (strings != null && strings.length > 0) {
return strings[strings.length - 1];
}
return null;
}
// -------------------------------------------------------------------------
// XXX QueryPart API
// -------------------------------------------------------------------------
@Override
public /* final */ void accept(Context ctx) {
if (term == ARRAY_AGG && asList(HSQLDB, POSTGRES).contains(ctx.family())) {
toSQLGroupConcat(ctx);
toSQLFilterClause(ctx);
toSQLOverClause(ctx);
}
else if (term == LIST_AGG && asList(CUBRID, H2, HSQLDB, MARIADB, MYSQL).contains(ctx.family())) {
toSQLGroupConcat(ctx);
}
else if (term == LIST_AGG && asList(POSTGRES).contains(ctx.family())) {
toSQLStringAgg(ctx);
toSQLFilterClause(ctx);
toSQLOverClause(ctx);
}
else if (term == MEDIAN && asList(POSTGRES).contains(ctx.family())) {
Field[] fields = new Field[arguments.size()];
for (int i = 0; i < fields.length; i++)
fields[i] = DSL.field("{0}", arguments.get(i));
ctx.visit(percentileCont(new BigDecimal("0.5")).withinGroupOrderBy(fields));
}
else {
toSQLArguments(ctx);
toSQLKeepDenseRankOrderByClause(ctx);
toSQLWithinGroupClause(ctx);
toSQLFilterClause(ctx);
toSQLOverClause(ctx);
}
}
/**
* [#1275] LIST_AGG emulation for Postgres, Sybase
*/
final void toSQLStringAgg(Context ctx) {
toSQLFunctionName(ctx);
ctx.sql('(');
if (distinct) {
ctx.keyword("distinct").sql(' ');
}
// The explicit cast is needed in Postgres
ctx.visit(((Field) arguments.get(0)).cast(String.class));
if (arguments.size() > 1) {
ctx.sql(", ");
ctx.visit(arguments.get(1));
}
else {
ctx.sql(", ''");
}
if (!withinGroupOrderBy.isEmpty()) {
ctx.sql(' ').keyword("order by").sql(' ')
.visit(withinGroupOrderBy);
}
ctx.sql(')');
}
/**
* [#1273] LIST_AGG emulation for MySQL and CUBRID
*/
final void toSQLGroupConcat(Context ctx) {
toSQLFunctionName(ctx);
ctx.sql('(');
if (distinct) {
ctx.keyword("distinct").sql(' ');
}
ctx.visit(arguments.get(0));
if (!withinGroupOrderBy.isEmpty()) {
ctx.sql(' ').keyword("order by").sql(' ')
.visit(withinGroupOrderBy);
}
if (arguments.size() > 1) {
ctx.sql(' ').keyword("separator").sql(' ')
.visit(arguments.get(1));
}
ctx.sql(')');
}
final void toSQLFilterClause(Context ctx) {
if (filter != null && (HSQLDB == ctx.family() || POSTGRES_9_4.precedes(ctx.dialect()))) {
ctx.sql(' ')
.keyword("filter")
.sql(" (")
.keyword("where")
.sql(' ')
.visit(filter)
.sql(')');
}
}
final void toSQLOverClause(Context ctx) {
QueryPart window = window(ctx);
// Render this clause only if needed
if (window == null)
return;
// [#1524] Don't render this clause where it is not supported
if (term == ROW_NUMBER && ctx.configuration().dialect() == HSQLDB)
return;
ctx.sql(' ')
.keyword("over")
.sql(' ')
.visit(window);
}
@SuppressWarnings("unchecked")
final QueryPart window(Context ctx) {
if (windowSpecification != null)
return DSL.sql("({0})", windowSpecification);
// [#3727] Referenced WindowDefinitions that contain a frame clause
// shouldn't be referenced from within parentheses (in PostgreSQL)
if (windowDefinition != null)
if (POSTGRES == ctx.family())
return windowDefinition;
else
return DSL.sql("({0})", windowDefinition);
// [#531] Inline window specifications if the WINDOW clause is not supported
if (windowName != null) {
if (asList(POSTGRES).contains(ctx.family())) {
return windowName;
}
Map map = (Map) ctx.data(DATA_LOCALLY_SCOPED_DATA_MAP);
QueryPartList windows = (QueryPartList) map.get(DATA_WINDOW_DEFINITIONS);
if (windows != null) {
for (WindowDefinition window : windows) {
if (((WindowDefinitionImpl) window).getName().equals(windowName)) {
return DSL.sql("({0})", window);
}
}
}
// [#3162] If a window specification is missing from the query's WINDOW clause,
// jOOQ should just render the window name regardless of the SQL dialect
else {
return windowName;
}
}
return null;
}
/**
* Render KEEP (DENSE_RANK [FIRST | LAST] ORDER BY {...}) clause
*/
final void toSQLKeepDenseRankOrderByClause(Context ctx) {
if (!keepDenseRankOrderBy.isEmpty()) {
ctx.sql(' ').keyword("keep")
.sql(" (").keyword("dense_rank")
.sql(' ').keyword(first ? "first" : "last")
.sql(' ').keyword("order by")
.sql(' ').visit(keepDenseRankOrderBy)
.sql(')');
}
}
/**
* Render WITHIN GROUP (ORDER BY ..) clause
*/
final void toSQLWithinGroupClause(Context ctx) {
if (!withinGroupOrderBy.isEmpty()) {
ctx.sql(' ').keyword("within group")
.sql(" (").keyword("order by")
.sql(' ').visit(withinGroupOrderBy)
.sql(')');
}
}
/**
* Render function arguments and argument modifiers
*/
final void toSQLArguments(Context ctx) {
toSQLFunctionName(ctx);
ctx.sql('(');
if (distinct) {
ctx.keyword("distinct");
// [#2883] PostgreSQL can use the DISTINCT keyword with formal row value expressions.
if (ctx.family() == POSTGRES && arguments.size() > 1) {
ctx.sql('(');
}
else {
ctx.sql(' ');
}
}
if (!arguments.isEmpty()) {
if (filter == null || HSQLDB == ctx.family() || POSTGRES_9_4.precedes(ctx.dialect())) {
ctx.visit(arguments);
}
else {
QueryPartList> expressions = new QueryPartList>();
for (QueryPart argument : arguments) {
expressions.add(DSL.when(filter, argument == ASTERISK ? one() : argument));
}
ctx.visit(expressions);
}
}
if (distinct) {
if (ctx.family() == POSTGRES && arguments.size() > 1) {
ctx.sql(')');
}
}
if (ignoreNulls) {
{
ctx.sql(' ').keyword("ignore nulls");
}
}
else if (respectNulls) {
{
ctx.sql(' ').keyword("respect nulls");
}
}
ctx.sql(')');
}
final void toSQLFunctionName(Context ctx) {
if (name != null) {
ctx.visit(name);
}
else if (term != null) {
ctx.sql(term.translate(ctx.configuration().dialect()));
}
else {
ctx.sql(getName());
}
}
// -------------------------------------------------------------------------
// XXX aggregate and window function fluent API methods
// -------------------------------------------------------------------------
final QueryPartList getArguments() {
return arguments;
}
@Override
public final AggregateFunction withinGroupOrderBy(Field... fields) {
withinGroupOrderBy.addAll(fields);
return this;
}
@Override
public final AggregateFunction withinGroupOrderBy(SortField... fields) {
withinGroupOrderBy.addAll(Arrays.asList(fields));
return this;
}
@Override
public final AggregateFunction withinGroupOrderBy(Collection> fields) {
withinGroupOrderBy.addAll(fields);
return this;
}
@Override
public final WindowBeforeOverStep filterWhere(Condition... conditions) {
return filterWhere(Arrays.asList(conditions));
}
@Override
public final WindowBeforeOverStep filterWhere(Collection conditions) {
ConditionProviderImpl c = new ConditionProviderImpl();
c.addConditions(conditions);
filter = c;
return this;
}
@Override
public final WindowBeforeOverStep filterWhere(Field field) {
return filterWhere(condition(field));
}
@Override
public final WindowBeforeOverStep filterWhere(Boolean field) {
return filterWhere(condition(field));
}
@Override
public final WindowBeforeOverStep filterWhere(SQL sql) {
return filterWhere(condition(sql));
}
@Override
public final WindowBeforeOverStep filterWhere(String sql) {
return filterWhere(condition(sql));
}
@Override
public final WindowBeforeOverStep filterWhere(String sql, Object... bindings) {
return filterWhere(condition(sql, bindings));
}
@Override
public final WindowBeforeOverStep filterWhere(String sql, QueryPart... parts) {
return filterWhere(condition(sql, parts));
}
@Override
public final WindowPartitionByStep over() {
windowSpecification = new WindowSpecificationImpl();
return this;
}
@Override
public final WindowFinalStep over(WindowSpecification specification) {
this.windowSpecification = (WindowSpecificationImpl) specification;
return this;
}
@Override
public final WindowFinalStep over(WindowDefinition definition) {
this.windowDefinition = (WindowDefinitionImpl) definition;
return this;
}
@Override
public final WindowFinalStep over(String n) {
return over(name(n));
}
@Override
public final WindowFinalStep over(Name n) {
this.windowName = n;
return this;
}
@Override
public final WindowOrderByStep partitionBy(Field... fields) {
windowSpecification.partitionBy(fields);
return this;
}
@Override
public final WindowOrderByStep partitionByOne() {
windowSpecification.partitionByOne();
return this;
}
@Override
public final Function orderBy(Field... fields) {
if (windowSpecification != null)
windowSpecification.orderBy(fields);
else
withinGroupOrderBy(fields);
return this;
}
@Override
public final Function orderBy(SortField... fields) {
if (windowSpecification != null)
windowSpecification.orderBy(fields);
else
withinGroupOrderBy(fields);
return this;
}
@Override
public final Function orderBy(Collection> fields) {
if (windowSpecification != null)
windowSpecification.orderBy(fields);
else
withinGroupOrderBy(fields);
return this;
}
@Override
public final WindowFinalStep rowsUnboundedPreceding() {
windowSpecification.rowsUnboundedPreceding();
return this;
}
@Override
public final WindowFinalStep rowsPreceding(int number) {
windowSpecification.rowsPreceding(number);
return this;
}
@Override
public final WindowFinalStep rowsCurrentRow() {
windowSpecification.rowsCurrentRow();
return this;
}
@Override
public final WindowFinalStep rowsUnboundedFollowing() {
windowSpecification.rowsUnboundedFollowing();
return this;
}
@Override
public final WindowFinalStep rowsFollowing(int number) {
windowSpecification.rowsFollowing(number);
return this;
}
@Override
public final WindowRowsAndStep rowsBetweenUnboundedPreceding() {
windowSpecification.rowsBetweenUnboundedPreceding();
return this;
}
@Override
public final WindowRowsAndStep rowsBetweenPreceding(int number) {
windowSpecification.rowsBetweenPreceding(number);
return this;
}
@Override
public final WindowRowsAndStep rowsBetweenCurrentRow() {
windowSpecification.rowsBetweenCurrentRow();
return this;
}
@Override
public final WindowRowsAndStep rowsBetweenUnboundedFollowing() {
windowSpecification.rowsBetweenUnboundedFollowing();
return this;
}
@Override
public final WindowRowsAndStep rowsBetweenFollowing(int number) {
windowSpecification.rowsBetweenFollowing(number);
return this;
}
@Override
public final WindowFinalStep rangeUnboundedPreceding() {
windowSpecification.rowsUnboundedPreceding();
return this;
}
@Override
public final WindowFinalStep rangePreceding(int number) {
windowSpecification.rowsPreceding(number);
return this;
}
@Override
public final WindowFinalStep rangeCurrentRow() {
windowSpecification.rowsCurrentRow();
return this;
}
@Override
public final WindowFinalStep rangeUnboundedFollowing() {
windowSpecification.rowsUnboundedFollowing();
return this;
}
@Override
public final WindowFinalStep rangeFollowing(int number) {
windowSpecification.rowsFollowing(number);
return this;
}
@Override
public final WindowRowsAndStep rangeBetweenUnboundedPreceding() {
windowSpecification.rowsBetweenUnboundedPreceding();
return this;
}
@Override
public final WindowRowsAndStep rangeBetweenPreceding(int number) {
windowSpecification.rowsBetweenPreceding(number);
return this;
}
@Override
public final WindowRowsAndStep rangeBetweenCurrentRow() {
windowSpecification.rowsBetweenCurrentRow();
return this;
}
@Override
public final WindowRowsAndStep rangeBetweenUnboundedFollowing() {
windowSpecification.rowsBetweenUnboundedFollowing();
return this;
}
@Override
public final WindowRowsAndStep rangeBetweenFollowing(int number) {
windowSpecification.rowsBetweenFollowing(number);
return this;
}
@Override
public final WindowFinalStep andUnboundedPreceding() {
windowSpecification.andUnboundedPreceding();
return this;
}
@Override
public final WindowFinalStep andPreceding(int number) {
windowSpecification.andPreceding(number);
return this;
}
@Override
public final WindowFinalStep andCurrentRow() {
windowSpecification.andCurrentRow();
return this;
}
@Override
public final WindowFinalStep andUnboundedFollowing() {
windowSpecification.andUnboundedFollowing();
return this;
}
@Override
public final WindowFinalStep andFollowing(int number) {
windowSpecification.andFollowing(number);
return this;
}
}
