com.sleepycat.persist.BasicCursor Maven / Gradle / Ivy
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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.persist;
import java.util.Iterator;
import com.sleepycat.compat.DbCompat;
import com.sleepycat.compat.DbCompat.OpReadOptions;
import com.sleepycat.compat.DbCompat.OpResult;
/* */
import com.sleepycat.je.CacheMode;
/* */
import com.sleepycat.je.DatabaseEntry;
import com.sleepycat.je.DatabaseException;
/* */
import com.sleepycat.je.Get;
/* */
import com.sleepycat.je.LockMode;
/* */
import com.sleepycat.je.OperationResult;
/* */
import com.sleepycat.je.OperationStatus;
/* */
import com.sleepycat.je.Put;
import com.sleepycat.je.ReadOptions;
import com.sleepycat.je.WriteOptions;
/* */
import com.sleepycat.util.keyrange.RangeCursor;
/**
* Implements EntityCursor and uses a ValueAdapter so that it can enumerate
* either keys or entities.
*
* @author Mark Hayes
*/
class BasicCursor implements EntityCursor {
RangeCursor cursor;
ValueAdapter adapter;
boolean updateAllowed;
DatabaseEntry key;
DatabaseEntry pkey;
DatabaseEntry data;
BasicCursor(RangeCursor cursor,
ValueAdapter adapter,
boolean updateAllowed) {
this.cursor = cursor;
this.adapter = adapter;
this.updateAllowed = updateAllowed;
key = adapter.initKey();
pkey = adapter.initPKey();
data = adapter.initData();
}
public V first()
throws DatabaseException {
return first(null);
}
public V first(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getFirst(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V last()
throws DatabaseException {
return last(null);
}
public V last(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getLast(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V next()
throws DatabaseException {
return next(null);
}
public V next(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getNext(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V nextDup()
throws DatabaseException {
return nextDup(null);
}
public V nextDup(LockMode lockMode)
throws DatabaseException {
checkInitialized();
return returnValue(
cursor.getNextDup(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V nextNoDup()
throws DatabaseException {
return nextNoDup(null);
}
public V nextNoDup(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getNextNoDup(
key, pkey, data, OpReadOptions.make(lockMode)));
}
public V prev()
throws DatabaseException {
return prev(null);
}
public V prev(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getPrev(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V prevDup()
throws DatabaseException {
return prevDup(null);
}
public V prevDup(LockMode lockMode)
throws DatabaseException {
checkInitialized();
return returnValue(
cursor.getPrevDup(key, pkey, data, OpReadOptions.make(lockMode)));
}
public V prevNoDup()
throws DatabaseException {
return prevNoDup(null);
}
public V prevNoDup(LockMode lockMode)
throws DatabaseException {
return returnValue(
cursor.getPrevNoDup(
key, pkey, data, OpReadOptions.make(lockMode)));
}
public V current()
throws DatabaseException {
return current(null);
}
public V current(LockMode lockMode)
throws DatabaseException {
checkInitialized();
return returnValue(
cursor.getCurrent(key, pkey, data, OpReadOptions.make(lockMode)));
}
/* */
public EntityResult get(Get getType, ReadOptions options)
throws DatabaseException {
OpReadOptions opOptions = OpReadOptions.make(options);
switch (getType) {
case CURRENT:
return returnResult(
cursor.getCurrent(key, pkey, data, opOptions));
case FIRST:
return returnResult(
cursor.getFirst(key, pkey, data, opOptions));
case LAST:
return returnResult(
cursor.getLast(key, pkey, data, opOptions));
case NEXT:
return returnResult(
cursor.getNext(key, pkey, data, opOptions));
case NEXT_DUP:
return returnResult(
cursor.getNextDup(key, pkey, data, opOptions));
case NEXT_NO_DUP:
return returnResult(
cursor.getNextNoDup(key, pkey, data, opOptions));
case PREV:
return returnResult(
cursor.getPrev(key, pkey, data, opOptions));
case PREV_DUP:
return returnResult(
cursor.getPrevDup(key, pkey, data, opOptions));
case PREV_NO_DUP:
return returnResult(
cursor.getPrevNoDup(key, pkey, data, opOptions));
default:
throw new IllegalArgumentException(
"getType not allowed: " + getType);
}
}
/* */
public int count()
throws DatabaseException {
checkInitialized();
return cursor.count();
}
/* */
public long countEstimate()
throws DatabaseException {
checkInitialized();
return cursor.getCursor().countEstimate();
}
/* */
/* */
/* for FUTURE use
public long skipNext(long maxCount) {
return skipNext(maxCount, null);
}
public long skipNext(long maxCount, LockMode lockMode) {
checkInitialized();
return cursor.getCursor().skipNext
(maxCount, BasicIndex.NO_RETURN_ENTRY, BasicIndex.NO_RETURN_ENTRY,
lockMode);
}
public long skipPrev(long maxCount) {
return skipPrev(maxCount, null);
}
public long skipPrev(long maxCount, LockMode lockMode) {
checkInitialized();
return cursor.getCursor().skipPrev
(maxCount, BasicIndex.NO_RETURN_ENTRY, BasicIndex.NO_RETURN_ENTRY,
lockMode);
}
*/
/* */
public Iterator iterator() {
return iterator(null);
}
public Iterator iterator(LockMode lockMode) {
return new BasicIterator(this, lockMode);
}
public boolean update(V entity)
throws DatabaseException {
/* */
if (DbCompat.IS_JE) {
return update(entity, null) != null;
}
/* */
if (!updateAllowed) {
throw new UnsupportedOperationException(
"Update not allowed on a secondary index");
}
checkInitialized();
adapter.valueToData(entity, data);
return cursor.getCursor().putCurrent(data) == OperationStatus.SUCCESS;
}
/* */
public OperationResult update(V entity, WriteOptions options)
throws DatabaseException {
if (!updateAllowed) {
throw new UnsupportedOperationException(
"Update not allowed on a secondary index");
}
checkInitialized();
adapter.valueToData(entity, data);
return cursor.getCursor().put(null, data, Put.CURRENT, options);
}
/* */
public boolean delete()
throws DatabaseException {
/* */
if (DbCompat.IS_JE) {
return delete(null) != null;
}
/* */
checkInitialized();
return cursor.getCursor().delete() == OperationStatus.SUCCESS;
}
/* */
public OperationResult delete(WriteOptions options)
throws DatabaseException {
checkInitialized();
return cursor.getCursor().delete(options);
}
/* */
public EntityCursor dup()
throws DatabaseException {
return new BasicCursor(cursor.dup(true), adapter, updateAllowed);
}
public void close()
throws DatabaseException {
cursor.close();
}
/* */
public void setCacheMode(CacheMode cacheMode) {
cursor.getCursor().setCacheMode(cacheMode);
}
/* */
/* */
public CacheMode getCacheMode() {
return cursor.getCursor().getCacheMode();
}
/* */
void checkInitialized()
throws IllegalStateException {
if (!cursor.isInitialized()) {
throw new IllegalStateException
("Cursor is not initialized at a valid position");
}
}
V returnValue(OpResult opResult) {
V value;
if (opResult.isSuccess()) {
value = adapter.entryToValue(key, pkey, data);
} else {
value = null;
}
/* Clear entries to save memory. */
adapter.clearEntries(key, pkey, data);
return value;
}
/* */
EntityResult returnResult(OpResult opResult) {
V value = returnValue(opResult);
return (value != null) ?
new EntityResult<>(value, opResult.jeResult) :
null;
}
/* */
}
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