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HSQLDB - Lightweight 100% Java SQL Database Engine
/* Copyright (c) 2001-2019, The HSQL Development Group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the HSQL Development Group nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL HSQL DEVELOPMENT GROUP, HSQLDB.ORG,
* OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package org.hsqldb.index;
import org.hsqldb.RangeVariable.RangeVariableConditions;
import org.hsqldb.Row;
import org.hsqldb.SchemaObject;
import org.hsqldb.Session;
import org.hsqldb.TableBase;
import org.hsqldb.navigator.RowIterator;
import org.hsqldb.persist.PersistentStore;
import org.hsqldb.types.Type;
/**
*
* @author Fred Toussi (fredt@users dot sourceforge.net)
* @version 2.5.0
* @since 1.9.0
*/
public interface Index extends SchemaObject {
int INDEX_NONE = 0;
int INDEX_NON_UNIQUE = 1;
int INDEX_UNIQUE = 2;
//
double minimumSelectivity = 16;
double cachedFactor = 8;
int probeDepth = 4;
//
Index[] emptyArray = new Index[]{};
IndexUse[] emptyUseArray = new IndexUse[]{};
IndexUse[] asArray();
RowIterator emptyIterator();
int getPosition();
void setPosition(int position);
long getPersistenceId();
/**
* Returns the count of visible columns used
*/
int getColumnCount();
/**
* Is this a PRIMARY_KEY index?
*/
boolean isPrimaryKey();
/**
* Is this a UNIQUE index?
*/
boolean isUnique();
/**
* Does this index belong to a constraint?
*/
boolean isConstraint();
/**
* Returns the array containing column indexes for index
*/
int[] getColumns();
/**
* Returns the array containing column indexes for index
*/
Type[] getColumnTypes();
/**
* Returns the count of visible columns used
*/
boolean[] getColumnDesc();
/**
* Returns the array containing 0, 1, .. column indexes
*/
int[] getDefaultColumnMap();
/**
* Returns a value indicating the order of different types of index in
* the list of indexes for a table. The position of the groups of Indexes
* in the list in ascending order is as follows:
*
* primary key index
* unique constraint indexes
* autogenerated foreign key indexes for FK's that reference this table or
* tables created before this table
* user created indexes (CREATE INDEX)
* autogenerated foreign key indexes for FK's that reference tables created
* after this table
*
* Among a group of indexes, the order is based on the order of creation
* of the index.
*
* @return ordinal value
*/
int getIndexOrderValue();
boolean isForward();
void setTable(TableBase table);
TableBase getTable();
void setClustered(boolean clustered);
boolean isClustered();
/**
* Returns the node count.
*/
long size(Session session, PersistentStore store);
long sizeUnique(PersistentStore store);
double[] searchCost(Session session, PersistentStore store);
long getNodeCount(Session session, PersistentStore store);
boolean isEmpty(PersistentStore store);
int checkIndex(Session session, PersistentStore store);
/**
* Insert a node into the index
*/
void insert(Session session, PersistentStore store, Row row
);
void delete(Session session, PersistentStore store, Row row);
boolean existsParent(Session session, PersistentStore store,
Object[] rowdata, int[] rowColMap);
/**
* Return the first node equal to the indexdata object. The rowdata has
* the same column mapping as this index.
*
* @param session session object
* @param store store object
* @param matchCount count of columns to match
* @return iterator
*/
RowIterator findFirstRow(Session session, PersistentStore store,
Object[] rowdata, int matchCount,
int distinctCount, int compareType,
boolean reversed, boolean[] map);
/**
* Return the first node equal to the rowdata object.
* The rowdata has the same column mapping as this table.
*
* @param session session object
* @param store store object
* @param rowdata array containing table row data
* @return iterator
*/
RowIterator findFirstRow(Session session, PersistentStore store,
Object[] rowdata);
/**
* Return the first node equal to the rowdata object.
* The rowdata has the column mapping provided in rowColMap.
*
* @param session session object
* @param store store object
* @param rowdata array containing table row data
* @return iterator
*/
RowIterator findFirstRow(Session session, PersistentStore store,
Object[] rowdata, int[] rowColMap);
/**
* Finds the first node where the data is not null.
*
* @return iterator
*/
RowIterator findFirstRowNotNull(Session session, PersistentStore store);
RowIterator firstRow(PersistentStore store);
/**
* Returns the row for the first node of the index
*
* @return Iterator for first row
*/
RowIterator firstRow(Session session, PersistentStore store,
RangeVariableConditions[] conditions,
int distinctCount, boolean[] map);
/**
* Returns the row for the last node of the index
*
* @return last row
*/
RowIterator lastRow(Session session, PersistentStore store,
int distinctCount, boolean[] map);
/**
* Compares two table rows based on the columns of this index. The rowColMap
* parameter specifies which columns of the other table are to be compared
* with the colIndex columns of this index. The rowColMap can cover all
* or only some columns of this index.
*
* @param a row from another table
* @param rowColMap column indexes in the other table
* @param b a full row in this table
*
* @return comparison result, -1,0,+1
*/
int compareRowNonUnique(Session session, Object[] a, Object[] b,
int[] rowColMap);
int compareRowNonUnique(Session session, Object[] a, Object[] b,
int[] rowColMap, int fieldCount);
/**
* As above but use the index column data
*/
int compareRowNonUnique(Session session, Object[] a, Object[] b,
int fieldcount);
int compareRow(Session session, Object[] a, Object[] b);
class IndexUse {
public Index index;
public int columnCount;
public IndexUse(Index index, int columnCount) {
this.index = index;
this.columnCount = columnCount;
}
}
}