org.h2.index.SpatialTreeIndex Maven / Gradle / Ivy
/*
* Copyright 2004-2014 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.index;
import java.util.HashSet;
import java.util.Iterator;
import org.h2.engine.Session;
import org.h2.message.DbException;
import org.h2.mvstore.MVStore;
import org.h2.mvstore.db.MVTableEngine;
import org.h2.mvstore.rtree.MVRTreeMap;
import org.h2.mvstore.rtree.SpatialKey;
import org.h2.result.Row;
import org.h2.result.SearchRow;
import org.h2.result.SortOrder;
import org.h2.table.Column;
import org.h2.table.IndexColumn;
import org.h2.table.Table;
import org.h2.table.TableFilter;
import org.h2.value.Value;
import org.h2.value.ValueGeometry;
import org.h2.value.ValueNull;
import com.vividsolutions.jts.geom.Envelope;
import com.vividsolutions.jts.geom.Geometry;
/**
* This is an index based on a MVR-TreeMap.
*
* @author Thomas Mueller
* @author Noel Grandin
* @author Nicolas Fortin, Atelier SIG, IRSTV FR CNRS 24888
*/
public class SpatialTreeIndex extends BaseIndex implements SpatialIndex {
private static final String MAP_PREFIX = "RTREE_";
private final MVRTreeMap treeMap;
private final MVStore store;
private boolean closed;
private boolean needRebuild;
/**
* Constructor.
*
* @param table the table instance
* @param id the index id
* @param indexName the index name
* @param columns the indexed columns (only one geometry column allowed)
* @param persistent whether the index should be persisted
* @param indexType the index type (only spatial index)
* @param create whether to create a new index
* @param session the session.
*/
public SpatialTreeIndex(Table table, int id, String indexName,
IndexColumn[] columns, IndexType indexType, boolean persistent,
boolean create, Session session) {
if (indexType.isUnique()) {
throw DbException.getUnsupportedException("not unique");
}
if (!persistent && !create) {
throw DbException.getUnsupportedException(
"Non persistent index called with create==false");
}
if (columns.length > 1) {
throw DbException.getUnsupportedException(
"can only do one column");
}
if ((columns[0].sortType & SortOrder.DESCENDING) != 0) {
throw DbException.getUnsupportedException(
"cannot do descending");
}
if ((columns[0].sortType & SortOrder.NULLS_FIRST) != 0) {
throw DbException.getUnsupportedException(
"cannot do nulls first");
}
if ((columns[0].sortType & SortOrder.NULLS_LAST) != 0) {
throw DbException.getUnsupportedException(
"cannot do nulls last");
}
initBaseIndex(table, id, indexName, columns, indexType);
this.needRebuild = create;
this.table = table;
if (!database.isStarting()) {
if (columns[0].column.getType() != Value.GEOMETRY) {
throw DbException.getUnsupportedException(
"spatial index on non-geometry column, " +
columns[0].column.getCreateSQL());
}
}
if (!persistent) {
// Index in memory
store = MVStore.open(null);
treeMap = store.openMap("spatialIndex",
new MVRTreeMap.Builder());
} else {
if (id < 0) {
throw DbException.getUnsupportedException(
"Persistent index with id<0");
}
MVTableEngine.init(session.getDatabase());
store = session.getDatabase().getMvStore().getStore();
// Called after CREATE SPATIAL INDEX or
// by PageStore.addMeta
treeMap = store.openMap(MAP_PREFIX + getId(),
new MVRTreeMap.Builder());
if (treeMap.isEmpty()) {
needRebuild = true;
}
}
}
@Override
public void close(Session session) {
store.close();
closed = true;
}
@Override
public void add(Session session, Row row) {
if (closed) {
throw DbException.throwInternalError();
}
treeMap.add(getKey(row), row.getKey());
}
private SpatialKey getKey(SearchRow row) {
if (row == null) {
return null;
}
Value v = row.getValue(columnIds[0]);
if (v == ValueNull.INSTANCE) {
return null;
}
Geometry g = ((ValueGeometry) v.convertTo(Value.GEOMETRY)).getGeometryNoCopy();
Envelope env = g.getEnvelopeInternal();
return new SpatialKey(row.getKey(),
(float) env.getMinX(), (float) env.getMaxX(),
(float) env.getMinY(), (float) env.getMaxY());
}
@Override
public void remove(Session session, Row row) {
if (closed) {
throw DbException.throwInternalError();
}
if (!treeMap.remove(getKey(row), row.getKey())) {
throw DbException.throwInternalError("row not found");
}
}
@Override
public Cursor find(TableFilter filter, SearchRow first, SearchRow last) {
return find(filter.getSession());
}
@Override
public Cursor find(Session session, SearchRow first, SearchRow last) {
return find(session);
}
private Cursor find(Session session) {
return new SpatialCursor(treeMap.keySet().iterator(), table, session);
}
@Override
public Cursor findByGeometry(TableFilter filter, SearchRow first,
SearchRow last, SearchRow intersection) {
if (intersection == null) {
return find(filter.getSession(), first, last);
}
return new SpatialCursor(
treeMap.findIntersectingKeys(getKey(intersection)), table,
filter.getSession());
}
/**
* Compute spatial index cost
* @param masks Search mask
* @param rowCount Table row count
* @param columns Table columns
* @return Index cost hint
*/
public static long getCostRangeIndex(int[] masks, long rowCount, Column[] columns) {
// Never use spatial tree index without spatial filter
if (columns.length == 0) {
return Long.MAX_VALUE;
}
for (Column column : columns) {
int index = column.getColumnId();
int mask = masks[index];
if ((mask & IndexCondition.SPATIAL_INTERSECTS) != IndexCondition.SPATIAL_INTERSECTS) {
return Long.MAX_VALUE;
}
}
return 2;
}
@Override
public double getCost(Session session, int[] masks,
TableFilter[] filters, int filter, SortOrder sortOrder,
HashSet allColumnsSet) {
return getCostRangeIndex(masks, table.getRowCountApproximation(), columns);
}
@Override
public void remove(Session session) {
if (!treeMap.isClosed()) {
store.removeMap(treeMap);
}
}
@Override
public void truncate(Session session) {
treeMap.clear();
}
@Override
public void checkRename() {
// nothing to do
}
@Override
public boolean needRebuild() {
return needRebuild;
}
@Override
public boolean canGetFirstOrLast() {
return true;
}
@Override
public Cursor findFirstOrLast(Session session, boolean first) {
if (closed) {
throw DbException.throwInternalError(toString());
}
if (!first) {
throw DbException.throwInternalError(
"Spatial Index can only be fetch by ascending order");
}
return find(session);
}
@Override
public long getRowCount(Session session) {
return treeMap.sizeAsLong();
}
@Override
public long getRowCountApproximation() {
return treeMap.sizeAsLong();
}
@Override
public long getDiskSpaceUsed() {
// TODO estimate disk space usage
return 0;
}
/**
* A cursor to iterate over spatial keys.
*/
private static final class SpatialCursor implements Cursor {
private final Iterator it;
private SpatialKey current;
private final Table table;
private Session session;
public SpatialCursor(Iterator it, Table table, Session session) {
this.it = it;
this.table = table;
this.session = session;
}
@Override
public Row get() {
return table.getRow(session, current.getId());
}
@Override
public SearchRow getSearchRow() {
return get();
}
@Override
public boolean next() {
if (!it.hasNext()) {
return false;
}
current = it.next();
return true;
}
@Override
public boolean previous() {
return false;
}
}
}
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