org.h2.expression.aggregate.AggregateDataEnvelope Maven / Gradle / Ivy
/*
* Copyright 2004-2019 H2 Group. Multiple-Licensed under the MPL 2.0,
* and the EPL 1.0 (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.expression.aggregate;
import java.util.ArrayList;
import org.h2.engine.Database;
import org.h2.expression.Expression;
import org.h2.expression.ExpressionColumn;
import org.h2.index.Index;
import org.h2.mvstore.db.MVSpatialIndex;
import org.h2.table.Column;
import org.h2.table.TableFilter;
import org.h2.util.geometry.GeometryUtils;
import org.h2.value.Value;
import org.h2.value.ValueGeometry;
import org.h2.value.ValueNull;
/**
* Data stored while calculating an aggregate.
*/
class AggregateDataEnvelope extends AggregateData {
private double[] envelope;
/**
* Get the index (if any) for the column specified in the geometry
* aggregate.
*
* @param on
* the expression (usually a column expression)
* @return the index, or null
*/
static Index getGeometryColumnIndex(Expression on) {
if (on instanceof ExpressionColumn) {
ExpressionColumn col = (ExpressionColumn) on;
Column column = col.getColumn();
if (column.getType().getValueType() == Value.GEOMETRY) {
TableFilter filter = col.getTableFilter();
if (filter != null) {
ArrayList indexes = filter.getTable().getIndexes();
if (indexes != null) {
for (int i = 1, size = indexes.size(); i < size; i++) {
Index index = indexes.get(i);
if (index instanceof MVSpatialIndex && index.isFirstColumn(column)) {
return index;
}
}
}
}
}
}
return null;
}
@Override
void add(Database database, Value v) {
if (v == ValueNull.INSTANCE) {
return;
}
envelope = GeometryUtils.union(envelope, ((ValueGeometry) v.convertTo(Value.GEOMETRY)).getEnvelopeNoCopy());
}
@Override
Value getValue(Database database, int dataType) {
return ValueGeometry.fromEnvelope(envelope);
}
}