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/*-
* Copyright (C) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
*
* This file was distributed by Oracle as part of a version of Oracle Berkeley
* DB Java Edition made available at:
*
* http://www.oracle.com/technetwork/database/database-technologies/berkeleydb/downloads/index.html
*
* Please see the LICENSE file included in the top-level directory of the
* appropriate version of Oracle Berkeley DB Java Edition for a copy of the
* license and additional information.
*/
package com.sleepycat.collections;
import java.util.Comparator;
import java.util.SortedMap;
import com.sleepycat.bind.EntityBinding;
import com.sleepycat.bind.EntryBinding;
import com.sleepycat.je.Database;
/* */
import com.sleepycat.je.EnvironmentFailureException; // for javadoc
import com.sleepycat.je.OperationFailureException; // for javadoc
/* */
import com.sleepycat.je.OperationStatus;
import com.sleepycat.util.RuntimeExceptionWrapper;
/**
* A SortedMap view of a {@link Database}.
*
* In addition to the standard SortedMap methods, this class provides the
* following methods for stored sorted maps only. Note that the use of these
* methods is not compatible with the standard Java collections interface.
*
* - {@link #headMap(Object, boolean)}
* - {@link #tailMap(Object, boolean)}
* - {@link #subMap(Object, boolean, Object, boolean)}
*
*
* @author Mark Hayes
*/
public class StoredSortedMap
extends StoredMap
implements SortedMap {
/**
* Creates a sorted map view of a {@link Database}.
*
* @param database is the Database underlying the new collection.
*
* @param keyBinding is the binding used to translate between key buffers
* and key objects.
*
* @param valueBinding is the binding used to translate between value
* buffers and value objects.
*
* @param writeAllowed is true to create a read-write collection or false
* to create a read-only collection.
*
* @throws IllegalArgumentException if formats are not consistently
* defined or a parameter is invalid.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public StoredSortedMap(Database database,
EntryBinding keyBinding,
EntryBinding valueBinding,
boolean writeAllowed) {
super(new DataView(database, keyBinding, valueBinding, null,
writeAllowed, null));
}
/**
* Creates a sorted map view of a {@link Database} with a {@link
* PrimaryKeyAssigner}. Writing is allowed for the created map.
*
* @param database is the Database underlying the new collection.
*
* @param keyBinding is the binding used to translate between key buffers
* and key objects.
*
* @param valueBinding is the binding used to translate between value
* buffers and value objects.
*
* @param keyAssigner is used by the {@link #append} method to assign
* primary keys.
*
* @throws IllegalArgumentException if formats are not consistently
* defined or a parameter is invalid.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public StoredSortedMap(Database database,
EntryBinding keyBinding,
EntryBinding valueBinding,
PrimaryKeyAssigner keyAssigner) {
super(new DataView(database, keyBinding, valueBinding, null,
true, keyAssigner));
}
/**
* Creates a sorted map entity view of a {@link Database}.
*
* @param database is the Database underlying the new collection.
*
* @param keyBinding is the binding used to translate between key buffers
* and key objects.
*
* @param valueEntityBinding is the binding used to translate between
* key/value buffers and entity value objects.
*
* @param writeAllowed is true to create a read-write collection or false
* to create a read-only collection.
*
* @throws IllegalArgumentException if formats are not consistently
* defined or a parameter is invalid.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public StoredSortedMap(Database database,
EntryBinding keyBinding,
EntityBinding valueEntityBinding,
boolean writeAllowed) {
super(new DataView(database, keyBinding, null, valueEntityBinding,
writeAllowed, null));
}
/**
* Creates a sorted map entity view of a {@link Database} with a {@link
* PrimaryKeyAssigner}. Writing is allowed for the created map.
*
* @param database is the Database underlying the new collection.
*
* @param keyBinding is the binding used to translate between key buffers
* and key objects.
*
* @param valueEntityBinding is the binding used to translate between
* key/value buffers and entity value objects.
*
* @param keyAssigner is used by the {@link #append} method to assign
* primary keys.
*
* @throws IllegalArgumentException if formats are not consistently
* defined or a parameter is invalid.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public StoredSortedMap(Database database,
EntryBinding keyBinding,
EntityBinding valueEntityBinding,
PrimaryKeyAssigner keyAssigner) {
super(new DataView(database, keyBinding, null, valueEntityBinding,
true, keyAssigner));
}
StoredSortedMap(DataView mapView) {
super(mapView);
}
/**
* Returns null since comparators are not supported. The natural ordering
* of a stored collection is data byte order, whether the data classes
* implement the {@link java.lang.Comparable} interface or not.
* This method does not conform to the {@link SortedMap#comparator}
* interface.
*
* @return null.
*/
public Comparator comparator() {
return null;
}
/**
* Returns the first (lowest) key currently in this sorted map.
* This method conforms to the {@link SortedMap#firstKey} interface.
*
* @return the first key.
*
*
* @throws OperationFailureException if one of the Read Operation
* Failures occurs.
*
* @throws EnvironmentFailureException if an unexpected, internal or
* environment-wide failure occurs.
*
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public K firstKey() {
return getFirstOrLastKey(true);
}
/**
* Returns the last (highest) element currently in this sorted map.
* This method conforms to the {@link SortedMap#lastKey} interface.
*
* @return the last key.
*
*
* @throws OperationFailureException if one of the Read Operation
* Failures occurs.
*
* @throws EnvironmentFailureException if an unexpected, internal or
* environment-wide failure occurs.
*
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public K lastKey() {
return getFirstOrLastKey(false);
}
private K getFirstOrLastKey(boolean doGetFirst) {
DataCursor cursor = null;
try {
cursor = new DataCursor(view, false);
OperationStatus status;
if (doGetFirst) {
status = cursor.getFirst(false);
} else {
status = cursor.getLast(false);
}
return (K) ((status == OperationStatus.SUCCESS) ?
cursor.getCurrentKey() :
null);
} catch (Exception e) {
throw StoredContainer.convertException(e);
} finally {
closeCursor(cursor);
}
}
/**
* Returns a view of the portion of this sorted set whose keys are
* strictly less than toKey.
* This method conforms to the {@link SortedMap#headMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param toKey is the upper bound.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap headMap(K toKey) {
return subMap(null, false, toKey, false);
}
/**
* Returns a view of the portion of this sorted map whose elements are
* strictly less than toKey, optionally including toKey.
* This method does not exist in the standard {@link SortedMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param toKey is the upper bound.
*
* @param toInclusive is true to include toKey.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap headMap(K toKey, boolean toInclusive) {
return subMap(null, false, toKey, toInclusive);
}
/**
* Returns a view of the portion of this sorted map whose elements are
* greater than or equal to fromKey.
* This method conforms to the {@link SortedMap#tailMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param fromKey is the lower bound.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap tailMap(K fromKey) {
return subMap(fromKey, true, null, false);
}
/**
* Returns a view of the portion of this sorted map whose elements are
* strictly greater than fromKey, optionally including fromKey.
* This method does not exist in the standard {@link SortedMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param fromKey is the lower bound.
*
* @param fromInclusive is true to include fromKey.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap tailMap(K fromKey, boolean fromInclusive) {
return subMap(fromKey, fromInclusive, null, false);
}
/**
* Returns a view of the portion of this sorted map whose elements range
* from fromKey, inclusive, to toKey, exclusive.
* This method conforms to the {@link SortedMap#subMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param fromKey is the lower bound.
*
* @param toKey is the upper bound.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap subMap(K fromKey, K toKey) {
return subMap(fromKey, true, toKey, false);
}
/**
* Returns a view of the portion of this sorted map whose elements are
* strictly greater than fromKey and strictly less than toKey,
* optionally including fromKey and toKey.
* This method does not exist in the standard {@link SortedMap} interface.
*
* Note that the return value is a StoredStoredMap and must be treated
* as such; for example, its iterators must be explicitly closed.
*
* @param fromKey is the lower bound.
*
* @param fromInclusive is true to include fromKey.
*
* @param toKey is the upper bound.
*
* @param toInclusive is true to include toKey.
*
* @return the submap.
*
* @throws RuntimeExceptionWrapper if a checked exception is thrown,
* including a {@code DatabaseException} on BDB (C edition).
*/
public SortedMap subMap(K fromKey,
boolean fromInclusive,
K toKey,
boolean toInclusive) {
try {
return new StoredSortedMap(
view.subView(fromKey, fromInclusive, toKey, toInclusive, null));
} catch (Exception e) {
throw StoredContainer.convertException(e);
}
}
}
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