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PropertyContainerProxyHelper.java
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PropertyContainerProxyHelper.java
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/*
* Copyright (c) 2002-2017 "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.core;
import java.util.HashMap;
import java.util.Map;
import org.neo4j.cursor.Cursor;
import org.neo4j.kernel.api.ReadOperations;
import org.neo4j.kernel.api.Statement;
import org.neo4j.storageengine.api.PropertyItem;
class PropertyContainerProxyHelper
{
private PropertyContainerProxyHelper()
{
}
static Map<String, Object> getProperties( Statement statement, Cursor<PropertyItem> propertyCursor, String[] keys )
{
// Create a map which is slightly larger than the list of keys
int numberOfKeys = keys.length;
Map<String,Object> properties = new HashMap<>( (int) (numberOfKeys * 1.3f) );
// Specific properties given
int[] propertyKeys = getPropertyKeys( statement, keys, numberOfKeys );
int propertiesToFind = numberOfKeys;
while ( propertiesToFind > 0 && propertyCursor.next() )
{
PropertyItem propertyItem = propertyCursor.get();
int propertyKeyId = propertyItem.propertyKeyId();
for ( int i = 0; i < propertyKeys.length; i++ )
{
if ( propertyKeys[i] == propertyKeyId )
{
properties.put( keys[i], propertyItem.value().asObjectCopy() );
propertiesToFind--;
break;
}
}
}
return properties;
}
private static int[] getPropertyKeys( Statement statement, String[] keys, int numberOfKeys )
{
int[] propertyKeys = new int[numberOfKeys];
ReadOperations readOperations = statement.readOperations();
for ( int i = 0; i < numberOfKeys; i++ )
{
String key = keys[i];
if ( key == null )
{
throw new NullPointerException( String.format( "Key %d was null", i + 1 ) );
}
propertyKeys[i] = readOperations.propertyKeyGetForName( key );
}
return propertyKeys;
}
}