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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
*
*
*
*
*
*
*
*
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*
*
*
*/
package org.jooq.impl;
import static org.jooq.impl.DSL.name;
import java.util.ArrayList;
import java.util.List;
// ...
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.Param;
import org.jooq.Record;
import org.jooq.Table;
import org.jooq.UDTRecord;
import org.jooq.exception.DataTypeException;
import org.jooq.util.h2.H2DataType;
/**
* An unnested array
*
* @author Lukas Eder
*/
final class ArrayTable extends AbstractTable {
/**
* Generated UID
*/
private static final long serialVersionUID = 2380426377794577041L;
private final Field array;
private final Fields field;
private final String alias;
ArrayTable(Field array) {
this(array, "array_table");
}
@SuppressWarnings({ "unchecked" })
ArrayTable(Field array, String alias) {
super(alias);
Class arrayType;
// TODO [#523] Solve this in a more object-oriented way...
if (array.getDataType().getType().isArray()) {
arrayType = array.getDataType().getType().getComponentType();
}
// Is this case possible?
else {
arrayType = Object.class;
}
this.array = array;
this.alias = alias;
this.field = init(alias, arrayType);
init(alias, arrayType);
}
@SuppressWarnings("unused")
ArrayTable(Field array, String alias, String[] fieldAliases) {
super(alias);
throw new UnsupportedOperationException("This constructor is not yet implemented");
}
private static final Fields init(String alias, Class arrayType) {
List> result = new ArrayList>();
// [#1114] VARRAY/TABLE of OBJECT have more than one field
if (UDTRecord.class.isAssignableFrom(arrayType)) {
try {
UDTRecord record = (UDTRecord) arrayType.newInstance();
for (Field f : record.fields()) {
result.add(DSL.field(name(alias, f.getName()), f.getDataType()));
}
}
catch (Exception e) {
throw new DataTypeException("Bad UDT Type : " + arrayType, e);
}
}
// Simple array types have a synthetic field called "COLUMN_VALUE"
else {
result.add(DSL.field(name(alias, "COLUMN_VALUE"), DSL.getDataType(arrayType)));
}
return new Fields(result);
}
@Override
public final Class getRecordType() {
return RecordImpl.class;
}
@Override
public final Table as(String as) {
return new ArrayTable(array, as);
}
@Override
public final Table as(String as, String... fieldAliases) {
return new ArrayTable(array, as, fieldAliases);
}
@Override
public final boolean declaresTables() {
// Always true, because unnested tables are always aliased
return true;
}
@Override
public final void accept(Context ctx) {
ctx.visit(table(ctx.configuration()));
}
private final Table table(Configuration configuration) {
switch (configuration.family()) {
case H2: {
return new H2ArrayTable().as(alias);
}
// [#756] These dialects need special care when aliasing unnested
// arrays
case HSQLDB:
case POSTGRES: {
return new PostgresHSQLDBTable().as(alias);
}
// Other dialects can simulate unnested arrays using UNION ALL
default: {
if (array.getDataType().getType().isArray() && array instanceof Param) {
return emulate();
}
else {
return DSL.table("{0}", array).as(alias);
}
}
}
}
private class PostgresHSQLDBTable extends DialectArrayTable {
/**
* Generated UID
*/
private static final long serialVersionUID = 6989279597964488457L;
@Override
public final void accept(Context ctx) {
ctx.sql('(').keyword("select").sql(" * ")
.keyword("from").sql(' ').keyword("unnest").sql('(').visit(array).sql(") ")
.keyword("as").sql(' ').literal(alias)
.sql('(').literal("COLUMN_VALUE").sql("))");
}
}
private class H2ArrayTable extends DialectArrayTable {
/**
* Generated UID
*/
private static final long serialVersionUID = 8679404596822098711L;
@Override
public final void accept(Context ctx) {
ctx.keyword("table(").sql("COLUMN_VALUE ");
// If the array type is unknown (e.g. because it's returned from
// a stored function
// Then the best choice for arbitrary types is varchar
if (array.getDataType().getType() == Object[].class) {
ctx.keyword(H2DataType.VARCHAR.getTypeName());
}
else {
ctx.keyword(array.getDataType().getTypeName());
}
ctx.sql(" = ").visit(array).sql(')');
}
}
private abstract class DialectArrayTable extends AbstractTable {
/**
* Generated UID
*/
private static final long serialVersionUID = 2662639259338694177L;
DialectArrayTable() {
super(alias);
}
@Override
public final Class getRecordType() {
return RecordImpl.class;
}
@Override
public final Table as(String as) {
return new TableAlias(this, as);
}
@Override
public final Table as(String as, String... fieldAliases) {
return new TableAlias(this, as, fieldAliases);
}
@Override
final Fields fields0() {
return ArrayTable.this.fields0();
}
}
@SuppressWarnings("unchecked")
private final ArrayTableEmulation emulate() {
return new ArrayTableEmulation(((Param) array).getValue(), alias);
}
@Override
final Fields fields0() {
return field;
}
}
