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Neo4jPackTest.java
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Neo4jPackTest.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.bolt.v1.messaging;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.ExpectedException;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.neo4j.bolt.v1.packstream.PackedInputArray;
import org.neo4j.bolt.v1.packstream.PackedOutputArray;
import org.neo4j.bolt.v1.runtime.Neo4jError;
import org.neo4j.kernel.api.exceptions.Status;
import org.neo4j.kernel.impl.util.ValueUtils;
import org.neo4j.values.AnyValue;
import org.neo4j.values.storable.TextArray;
import org.neo4j.values.storable.TextValue;
import org.neo4j.values.storable.UTF8StringValue;
import org.neo4j.values.storable.Values;
import org.neo4j.values.virtual.ListValue;
import org.neo4j.values.virtual.MapValue;
import org.neo4j.values.virtual.PathValue;
import org.neo4j.values.virtual.VirtualValues;
import static org.hamcrest.CoreMatchers.equalTo;
import static org.hamcrest.CoreMatchers.instanceOf;
import static org.hamcrest.MatcherAssert.assertThat;
import static org.hamcrest.Matchers.is;
import static org.neo4j.bolt.v1.messaging.example.Edges.ALICE_KNOWS_BOB;
import static org.neo4j.bolt.v1.messaging.example.Nodes.ALICE;
import static org.neo4j.bolt.v1.messaging.example.Paths.ALL_PATHS;
import static org.neo4j.values.storable.Values.charValue;
import static org.neo4j.values.storable.Values.longValue;
import static org.neo4j.values.storable.Values.stringValue;
public class Neo4jPackTest
{
@Rule
public ExpectedException exception = ExpectedException.none();
private byte[] packed( AnyValue object ) throws IOException
{
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.pack( object );
return output.bytes();
}
private AnyValue unpacked( byte[] bytes ) throws IOException
{
PackedInputArray input = new PackedInputArray( bytes );
Neo4jPack.Unpacker unpacker = new Neo4jPack.Unpacker( input );
return unpacker.unpack();
}
@SuppressWarnings( "unchecked" )
@Test
public void shouldBeAbleToPackAndUnpackListStream() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.packListStreamHeader();
List<String> expected = new ArrayList<>();
TextArray labels = ALICE.labels();
for ( int i = 0; i < labels.length(); i++ )
{
String labelName = labels.stringValue( i );
packer.pack( labelName );
expected.add( labelName );
}
packer.packEndOfStream();
AnyValue unpacked = unpacked( output.bytes() );
// Then
assertThat( unpacked, instanceOf( ListValue.class ) );
ListValue unpackedList = (ListValue) unpacked;
assertThat( unpackedList, equalTo( ValueUtils.asListValue( expected ) ) );
}
@SuppressWarnings( "unchecked" )
@Test
public void shouldBeAbleToPackAndUnpackMapStream() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.packMapStreamHeader();
ALICE.properties().foreach( ( s, value ) ->
{
try
{
packer.pack( s );
packer.pack( value );
}
catch ( IOException e )
{
e.printStackTrace();
}
} );
packer.packEndOfStream();
AnyValue unpacked = unpacked( output.bytes() );
// Then
assertThat( unpacked, instanceOf( MapValue.class ) );
MapValue unpackedMap = (MapValue) unpacked;
assertThat( unpackedMap, equalTo( ALICE.properties() ) );
}
@SuppressWarnings( "unchecked" )
@Test
public void shouldFailWhenTryingToPackAndUnpackMapStreamContainingNullKeys() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.packMapStreamHeader();
HashMap<String,AnyValue> map = new HashMap<>();
map.put( null, longValue( 42L ) );
map.put( "foo", longValue( 1337L ) );
for ( Map.Entry<String,AnyValue> entry : map.entrySet() )
{
packer.pack( entry.getKey() );
packer.pack( entry.getValue() );
}
packer.packEndOfStream();
// When
PackedInputArray input = new PackedInputArray( output.bytes() );
Neo4jPack.Unpacker unpacker = new Neo4jPack.Unpacker( input );
unpacker.unpack();
// Then
assertThat( unpacker.consumeError().get(), equalTo(
Neo4jError.from( Status.Request.Invalid,
"Value `null` is not supported as key in maps, must be a non-nullable string." ) ) );
}
@Test
public void shouldErrorOnUnpackingMapWithDuplicateKeys() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.packMapHeader( 2 );
packer.pack( "key" );
packer.pack( 1 );
packer.pack( "key" );
packer.pack( 2 );
// When
PackedInputArray input = new PackedInputArray( output.bytes() );
Neo4jPack.Unpacker unpacker = new Neo4jPack.Unpacker( input );
unpacker.unpack();
// Then
assertThat( unpacker.consumeError().get(),
equalTo( Neo4jError.from( Status.Request.Invalid, "Duplicate map key `key`." ) ) );
}
@Test
public void shouldNotBeAbleToUnpackNode() throws IOException
{
// Expect
exception.expect( BoltIOException.class );
// When
unpacked( packed( ALICE ) );
}
@Test
public void shouldNotBeAbleToUnpackRelationship() throws IOException
{
// Expect
exception.expect( BoltIOException.class );
// When
unpacked( packed( ALICE_KNOWS_BOB ) );
}
@Test
public void shouldNotBeAbleToUnpackPaths() throws IOException
{
for ( PathValue path : ALL_PATHS )
{
// Expect
exception.expect( BoltIOException.class );
// When
unpacked( packed( path ) );
}
}
@Test
public void shouldTreatSingleCharAsSingleCharacterString() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.pack( charValue( 'C' ) );
AnyValue unpacked = unpacked( output.bytes() );
// Then
assertThat( unpacked, instanceOf( TextValue.class ) );
assertThat( unpacked, equalTo( stringValue( "C" ) ) );
}
@Test
public void shouldTreatCharArrayAsListOfStrings() throws IOException
{
// Given
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.pack( Values.charArray( new char[]{'W', 'H', 'Y'} ) );
Object unpacked = unpacked( output.bytes() );
// Then
assertThat( unpacked, instanceOf( ListValue.class ) );
assertThat( unpacked,
equalTo( VirtualValues.list( stringValue( "W" ), stringValue( "H" ), stringValue( "Y" ) ) ) );
}
@Test
public void shouldPackUtf8() throws IOException
{
// Given
String value = "\uD83D\uDE31";
byte[] bytes = value.getBytes( StandardCharsets.UTF_8 );
TextValue textValue = Values.utf8Value( bytes, 0, bytes.length );
PackedOutputArray output = new PackedOutputArray();
Neo4jPack.Packer packer = new Neo4jPack.Packer( output );
packer.pack( textValue );
// When
AnyValue unpacked = unpacked( output.bytes() );
assertThat( unpacked, is( instanceOf( UTF8StringValue.class ) ));
// Then
assertThat( unpacked, equalTo( textValue ) );
}
private static class Unpackable
{
}
}