/*
* 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
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* http://www.apache.org/licenses/LICENSE-2.0
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* See the License for the specific language governing permissions and
* limitations under the License.
*
* Other licenses:
* -----------------------------------------------------------------------------
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* 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.falseCondition;
import static org.jooq.impl.DSL.name;
import static org.jooq.impl.DSL.one;
import static org.jooq.impl.DSL.using;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.Name;
import org.jooq.Record;
import org.jooq.Select;
import org.jooq.Table;
/**
* Essentially, this is the same as <code>ArrayTable</code>, except that it simulates
* unnested arrays using <code>UNION ALL</code>
*
* @author Lukas Eder
*/
final class ArrayTableEmulation extends AbstractTable<Record> {
/**
* Generated UID
*/
private static final long serialVersionUID = 2392515064450536343L;
private final Object[] array;
private final Fields<Record> field;
private final Name alias;
private final Name fieldAlias;
private transient Table<Record> table;
ArrayTableEmulation(Object[] array) {
this(array, DSL.name("array_table"), null);
}
ArrayTableEmulation(Object[] array, Name alias) {
this(array, alias, null);
}
ArrayTableEmulation(Object[] array, Name alias, Name fieldAlias) {
super(alias);
this.array = array;
this.alias = alias;
this.fieldAlias = fieldAlias == null ? DSL.name("COLUMN_VALUE") : fieldAlias;
this.field = new Fields<Record>(DSL.field(name(alias.last(), this.fieldAlias.last()), DSL.getDataType(array.getClass().getComponentType())));
}
@Override
public final Class<? extends Record> getRecordType() {
return RecordImpl.class;
}
@Override
public final Table<Record> as(Name as) {
return new ArrayTableEmulation(array, as);
}
@Override
public final Table<Record> as(Name as, Name... fieldAliases) {
if (fieldAliases == null)
return new ArrayTableEmulation(array, as);
else if (fieldAliases.length == 1)
return new ArrayTableEmulation(array, as, fieldAliases[0]);
throw new IllegalArgumentException("Array table simulations can only have a single field alias");
}
@Override
public final boolean declaresTables() {
// [#1055] Always true, because unnested tables are always aliased.
// This is particularly important for simulated unnested arrays
return true;
}
@Override
public final void accept(Context<?> ctx) {
ctx.visit(table(ctx.configuration()));
}
@Override
final Fields<Record> fields0() {
return field;
}
private final Table<Record> table(Configuration configuration) {
if (table == null) {
Select<Record> select = null;
for (Object element : array) {
// [#1081] Be sure to get the correct cast type also for null
Field<?> val = DSL.val(element, field.fields[0].getDataType());
Select<Record> subselect = using(configuration).select(val.as("COLUMN_VALUE")).select();
if (select == null) {
select = subselect;
}
else {
select = select.unionAll(subselect);
}
}
// Empty arrays should result in empty tables
if (select == null) {
select = using(configuration).select(one().as("COLUMN_VALUE")).select().where(falseCondition());
}
table = DSL.table(select).as(alias);
}
return table;
}
}