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ArrayEncoder.java
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ArrayEncoder.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.api.index;
import java.lang.reflect.Array;
import java.util.Base64;
import org.neo4j.string.UTF8;
import org.neo4j.values.Value;
import org.neo4j.values.ValueWriter;
import org.neo4j.values.Values;
public final class ArrayEncoder
{
private static final Base64.Encoder base64Encoder = Base64.getEncoder();
private ArrayEncoder()
{
throw new AssertionError( "Not for instantiation!" );
}
@Deprecated
public static String encode( Object array )
{
if ( !array.getClass().isArray() )
{
throw new IllegalArgumentException( "Only works with arrays" );
}
StringBuilder builder = new StringBuilder();
int length = Array.getLength( array );
String type = "";
for ( int i = 0; i < length; i++ )
{
Object o = Array.get( array, i );
if ( o instanceof Number )
{
type = "D";
builder.append( ((Number) o).doubleValue() );
}
else if ( o instanceof Boolean )
{
type = "Z";
builder.append( o );
}
else
{
type = "L";
String str = o.toString();
builder.append( base64Encoder.encodeToString( UTF8.encode( str ) ) );
}
builder.append( "|" );
}
return type + builder.toString();
}
public static String encode( Value array )
{
if ( !Values.isArrayValue( array ) )
{
throw new IllegalArgumentException( "Only works with arrays" );
}
ValueEncoder encoder = new ValueEncoder();
array.writeTo( encoder );
return encoder.result();
}
static class ValueEncoder implements ValueWriter
{
StringBuilder builder;
ValueEncoder()
{
builder = new StringBuilder();
}
public String result()
{
return builder.toString();
}
@Override
public void writeNull()
{
}
@Override
public void writeBoolean( boolean value )
{
builder.append( value );
builder.append( '|' );
}
@Override
public void writeInteger( byte value )
{
builder.append( (double)value );
builder.append( '|' );
}
@Override
public void writeInteger( short value )
{
builder.append( (double)value );
builder.append( '|' );
}
@Override
public void writeInteger( int value )
{
builder.append( (double)value );
builder.append( '|' );
}
@Override
public void writeInteger( long value )
{
builder.append( (double)value );
builder.append( '|' );
}
@Override
public void writeFloatingPoint( float value )
{
builder.append( (double)value );
builder.append( '|' );
}
@Override
public void writeFloatingPoint( double value )
{
builder.append( value );
builder.append( '|' );
}
@Override
public void writeString( String value )
{
builder.append( value );
builder.append( '|' );
}
@Override
public void writeString( char value )
{
builder.append( value );
builder.append( '|' );
}
@Override
public void writeString( char[] value, int offset, int length )
{
builder.append( value, offset, length );
builder.append( '|' );
}
@Override
public void beginUTF8( int size )
{
throw new UnsupportedOperationException( "direct UTF8 encoding is not supported yet!" );
}
@Override
public void copyUTF8( long fromAddress, int length )
{
throw new UnsupportedOperationException( "direct UTF8 encoding is not supported yet!" );
}
@Override
public void endUTF8()
{
throw new UnsupportedOperationException( "direct UTF8 encoding is not supported yet!" );
}
@Override
public void beginArray( int size, ArrayType arrayType )
{
builder.append( typeChar( arrayType ) );
}
@Override
public void endArray()
{
}
private char typeChar( ArrayType arrayType )
{
switch ( arrayType )
{
case BOOLEAN: return 'Z';
case BYTE: return 'D';
case SHORT: return 'D';
case INT: return 'D';
case LONG: return 'D';
case FLOAT: return 'D';
case DOUBLE: return 'D';
case CHAR: return 'L';
case STRING: return 'L';
default: throw new UnsupportedOperationException( "Not supported array type: "+arrayType );
}
}
}
}