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StorePropertyCursor.java
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StorePropertyCursor.java
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/*
* Copyright (c) 2002-2016 "Neo Technology,"
* Network Engine for Objects in Lund AB [http://neotechnology.com]
*
* This file is part of Neo4j.
*
* Neo4j is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package org.neo4j.kernel.impl.api.store;
import java.io.IOException;
import org.neo4j.cursor.Cursor;
import org.neo4j.function.Consumer;
import org.neo4j.io.pagecache.PageCursor;
import org.neo4j.kernel.api.cursor.PropertyItem;
import org.neo4j.kernel.impl.locking.Lock;
import org.neo4j.kernel.impl.store.PropertyStore;
import org.neo4j.kernel.impl.store.UnderlyingStorageException;
import org.neo4j.kernel.impl.store.id.IdGeneratorImpl;
import org.neo4j.kernel.impl.store.record.Record;
/**
* Cursor for all properties on a node or relationship.
*/
public class StorePropertyCursor implements Cursor<PropertyItem>, PropertyItem
{
private final PropertyStore propertyStore;
private final Consumer<StorePropertyCursor> instanceCache;
private final StorePropertyPayloadCursor payload;
private long nextPropertyRecordId;
private Lock lock;
public StorePropertyCursor( PropertyStore propertyStore, Consumer<StorePropertyCursor> instanceCache )
{
this.propertyStore = propertyStore;
this.instanceCache = instanceCache;
this.payload = new StorePropertyPayloadCursor( propertyStore.getStringStore(), propertyStore.getArrayStore() );
}
public StorePropertyCursor init( long firstPropertyId, Lock lock )
{
nextPropertyRecordId = firstPropertyId;
this.lock = lock;
return this;
}
@Override
public boolean next()
{
if ( payload.next() )
{
return true;
}
while ( nextPropertyRecordId != Record.NO_NEXT_PROPERTY.intValue() )
{
try ( PageCursor cursor = propertyStore.newReadCursor( nextPropertyRecordId ) )
{
int offset = cursor.getOffset();
do
{
cursor.setOffset( offset );
nextPropertyRecordId = readNextPropertyRecordId( cursor );
payload.clear();
payload.init( cursor );
}
while ( cursor.shouldRetry() );
}
catch ( IOException e )
{
throw new UnderlyingStorageException( e );
}
if ( payload.next() )
{
return true;
}
}
return false;
}
@Override
public int propertyKeyId()
{
return payload.propertyKeyId();
}
@Override
public Object value()
{
return payloadValueAsObject( payload );
}
@Override
public PropertyItem get()
{
return this;
}
@Override
public void close()
{
try
{
payload.clear();
instanceCache.accept( this );
}
finally
{
lock.release();
}
}
static Object payloadValueAsObject( StorePropertyPayloadCursor payload )
{
switch ( payload.type() )
{
case BOOL:
return payload.booleanValue();
case BYTE:
return payload.byteValue();
case SHORT:
return payload.shortValue();
case CHAR:
return payload.charValue();
case INT:
return payload.intValue();
case LONG:
return payload.longValue();
case FLOAT:
return payload.floatValue();
case DOUBLE:
return payload.doubleValue();
case SHORT_STRING:
return payload.shortStringValue();
case STRING:
return payload.stringValue();
case SHORT_ARRAY:
return payload.shortArrayValue();
case ARRAY:
return payload.arrayValue();
default:
throw new IllegalStateException( "No such type:" + payload.type() );
}
}
private static long readNextPropertyRecordId( PageCursor cursor )
{
byte modifiers = cursor.getByte();
// We don't care about previous pointer (prevProp)
cursor.getUnsignedInt();
long nextProp = cursor.getUnsignedInt();
long nextMod = (modifiers & 0x0FL) << 32;
return longFromIntAndMod( nextProp, nextMod );
}
private static long longFromIntAndMod( long base, long modifier )
{
return modifier == 0 && base == IdGeneratorImpl.INTEGER_MINUS_ONE ? -1 : base | modifier;
}
}