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ValueEncoding.java
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ValueEncoding.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.api.impl.schema;
import org.apache.lucene.document.DoubleField;
import org.apache.lucene.document.Field;
import org.apache.lucene.document.StringField;
import org.apache.lucene.index.Term;
import org.apache.lucene.search.ConstantScoreQuery;
import org.apache.lucene.search.NumericRangeQuery;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.TermQuery;
import org.neo4j.kernel.api.index.ArrayEncoder;
import static org.apache.lucene.document.Field.Store.NO;
/**
* Enumeration representing all possible property types with corresponding encodings and query structures for Lucene
* schema indexes.
*/
enum ValueEncoding
{
Number
{
@Override
String key()
{
return "number";
}
@Override
boolean canEncode( Object value )
{
return value instanceof Number;
}
@Override
Field encodeField( Object value )
{
return new DoubleField( key(), ((Number) value).doubleValue(), NO );
}
@Override
void setFieldValue( Object value, Field field )
{
field.setDoubleValue( ((Number) value).doubleValue() );
}
@Override
Query encodeQuery( Object value )
{
Double doubleValue = ((Number) value).doubleValue();
return new ConstantScoreQuery( NumericRangeQuery.newDoubleRange( key(), doubleValue, doubleValue,
true, true ) );
}
},
Array
{
@Override
String key()
{
return "array";
}
@Override
boolean canEncode( Object value )
{
return value.getClass().isArray();
}
@Override
Field encodeField( Object value )
{
return stringField( key(), ArrayEncoder.encode( value ) );
}
@Override
void setFieldValue( Object value, Field field )
{
field.setStringValue( ArrayEncoder.encode( value ) );
}
@Override
Query encodeQuery( Object value )
{
return new ConstantScoreQuery( new TermQuery( new Term( key(), ArrayEncoder.encode( value ) ) ) );
}
},
Bool
{
@Override
String key()
{
return "bool";
}
@Override
boolean canEncode( Object value )
{
return value instanceof Boolean;
}
@Override
Field encodeField( Object value )
{
return stringField( key(), value.toString() );
}
@Override
void setFieldValue( Object value, Field field )
{
field.setStringValue( value.toString() );
}
@Override
Query encodeQuery( Object value )
{
return new ConstantScoreQuery( new TermQuery( new Term( key(), value.toString() ) ) );
}
},
String
{
@Override
String key()
{
return "string";
}
@Override
boolean canEncode( Object value )
{
// Any other type can be safely serialised as a string
return true;
}
@Override
Field encodeField( Object value )
{
return stringField( key(), value.toString() );
}
@Override
void setFieldValue( Object value, Field field )
{
field.setStringValue( value.toString() );
}
@Override
Query encodeQuery( Object value )
{
return new ConstantScoreQuery( new TermQuery( new Term( key(), value.toString() ) ) );
}
};
private static final ValueEncoding[] AllEncodings = values();
abstract String key();
abstract boolean canEncode( Object value );
abstract Field encodeField( Object value );
abstract void setFieldValue( Object value, Field field );
abstract Query encodeQuery( Object value );
public static ValueEncoding forKey( String key )
{
for ( ValueEncoding encoding : AllEncodings )
{
if ( encoding.key().equals( key ) )
{
return encoding;
}
}
throw new IllegalArgumentException( "Unknown key: " + key );
}
public static ValueEncoding forValue( Object value )
{
for ( ValueEncoding encoding : AllEncodings )
{
if ( encoding.canEncode( value ) )
{
return encoding;
}
}
throw new IllegalStateException( "Unable to encode the value " + value );
}
private static Field stringField( String identifier, String value )
{
return new StringField( identifier, value, NO );
}
}