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NumberValueConversion.java
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NumberValueConversion.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.index.schema;
import org.neo4j.values.Value;
import org.neo4j.values.Values;
import static org.neo4j.kernel.impl.index.schema.NumberKey.TYPE_DOUBLE;
import static org.neo4j.kernel.impl.index.schema.NumberKey.TYPE_FLOAT;
import static org.neo4j.kernel.impl.index.schema.NumberKey.TYPE_LONG;
/**
* Utilities for converting number values to and from different representations.
*/
class NumberValueConversion
{
static Number assertValidSingleNumber( Value[] values )
{
// TODO: support multiple values, right?
if ( values.length > 1 )
{
throw new IllegalArgumentException( "Tried to create composite key with non-composite schema key layout" );
}
if ( values.length < 1 )
{
throw new IllegalArgumentException( "Tried to create key without value" );
}
if ( !Values.isNumberValue( values[0] ) )
{
throw new IllegalArgumentException(
"Key layout does only support numbers, tried to create key from " + values[0] );
}
return (Number) values[0].asObject();
}
static Number toValue( byte type, long rawValueBits )
{
switch ( type )
{
case TYPE_LONG:
return rawValueBits;
case TYPE_FLOAT:
return Float.intBitsToFloat( (int)rawValueBits );
case TYPE_DOUBLE:
return Double.longBitsToDouble( rawValueBits );
default:
throw new IllegalArgumentException( "Unexpected type " + type );
}
}
}