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Neo4jJsonCodec.java
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Neo4jJsonCodec.java
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/*
* Copyright (c) 2002-2018 "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.server.rest.transactional;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;
import org.codehaus.jackson.map.SerializationConfig;
import java.io.IOException;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.OffsetTime;
import java.time.ZonedDateTime;
import java.time.temporal.Temporal;
import java.time.temporal.TemporalAmount;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.Set;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Path;
import org.neo4j.graphdb.PropertyContainer;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.spatial.CRS;
import org.neo4j.graphdb.spatial.Coordinate;
import org.neo4j.graphdb.spatial.Geometry;
import org.neo4j.graphdb.spatial.Point;
import org.neo4j.values.storable.PointValue;
import static org.neo4j.helpers.collection.MapUtil.genericMap;
public class Neo4jJsonCodec extends ObjectMapper
{
private enum Neo4jJsonMetaType
{
node, relationship, datetime, time, localdatetime, date, localtime, duration, point2d, point3d
}
private TransitionalPeriodTransactionMessContainer container;
public Neo4jJsonCodec( TransitionalPeriodTransactionMessContainer container )
{
this();
this.container = container;
}
public Neo4jJsonCodec()
{
getSerializationConfig().without( SerializationConfig.Feature.FLUSH_AFTER_WRITE_VALUE );
}
@Override
public void writeValue( JsonGenerator out, Object value ) throws IOException
{
if ( value instanceof PropertyContainer )
{
try ( TransactionStateChecker txStateChecker = TransactionStateChecker.create( container ) )
{
writePropertyContainer( out, (PropertyContainer) value, txStateChecker );
}
}
else if ( value instanceof Path )
{
try ( TransactionStateChecker txStateChecker = TransactionStateChecker.create( container ) )
{
writePath( out, ((Path) value).iterator(), txStateChecker );
}
}
else if ( value instanceof Iterable )
{
writeIterator( out, ((Iterable) value).iterator() );
}
else if ( value instanceof byte[] )
{
writeByteArray( out, (byte[]) value );
}
else if ( value instanceof Map )
{
writeMap(out, (Map) value );
}
else if ( value instanceof Geometry )
{
Geometry geom = (Geometry) value;
Object coordinates = (geom instanceof Point) ? ((Point) geom).getCoordinate() : geom.getCoordinates();
writeMap( out, genericMap( new LinkedHashMap<>(), "type", geom.getGeometryType(), "coordinates", coordinates, "crs", geom.getCRS() ) );
}
else if ( value instanceof Coordinate )
{
Coordinate coordinate = (Coordinate) value;
writeIterator( out, coordinate.getCoordinate().iterator() );
}
else if ( value instanceof CRS )
{
CRS crs = (CRS) value;
writeMap( out, genericMap( new LinkedHashMap<>(), "name", crs.getType(), "type", "link", "properties",
genericMap( new LinkedHashMap<>(), "href", crs.getHref() + "ogcwkt/", "type", "ogcwkt" ) ) );
}
else if ( value instanceof Temporal || value instanceof TemporalAmount )
{
super.writeValue( out, value.toString() );
}
else
{
super.writeValue( out, value );
}
}
private void writeMap( JsonGenerator out, Map value ) throws IOException
{
out.writeStartObject();
try
{
Set<Map.Entry> set = value.entrySet();
for ( Map.Entry e : set )
{
Object key = e.getKey();
out.writeFieldName( key == null ? "null" : key.toString() );
writeValue( out, e.getValue() );
}
}
finally
{
out.writeEndObject();
}
}
private void writeIterator( JsonGenerator out, Iterator value ) throws IOException
{
out.writeStartArray();
try
{
while ( value.hasNext() )
{
writeValue( out, value.next() );
}
}
finally
{
out.writeEndArray();
}
}
private void writePath( JsonGenerator out, Iterator<PropertyContainer> value,
TransactionStateChecker txStateChecker ) throws IOException
{
out.writeStartArray();
try
{
while ( value.hasNext() )
{
writePropertyContainer( out, value.next(), txStateChecker );
}
}
finally
{
out.writeEndArray();
}
}
private void writePropertyContainer( JsonGenerator out, PropertyContainer value,
TransactionStateChecker txStateChecker )
throws IOException
{
if ( value instanceof Node )
{
writeNodeOrRelationship( out, value, txStateChecker.isNodeDeletedInCurrentTx( ((Node) value).getId() ) );
}
else if ( value instanceof Relationship )
{
writeNodeOrRelationship( out, value,
txStateChecker.isRelationshipDeletedInCurrentTx( ((Relationship) value).getId() ) );
}
else
{
throw new IllegalArgumentException( "Expected a Node or Relationship, but got a " + value.toString() );
}
}
private void writeNodeOrRelationship( JsonGenerator out, PropertyContainer entity, boolean isDeleted )
throws IOException
{
out.writeStartObject();
try
{
if ( !isDeleted )
{
for ( Map.Entry<String,Object> property : entity.getAllProperties().entrySet() )
{
out.writeObjectField( property.getKey(), property.getValue() );
}
}
}
finally
{
out.writeEndObject();
}
}
private void writeByteArray( JsonGenerator out, byte[] bytes ) throws IOException
{
out.writeStartArray();
try
{
for ( byte b : bytes )
{
out.writeNumber( (int) b );
}
}
finally
{
out.writeEndArray();
}
}
void writeMeta( JsonGenerator out, Object value ) throws IOException
{
if ( value instanceof Node )
{
Node node = (Node) value;
try ( TransactionStateChecker stateChecker = TransactionStateChecker.create( container ) )
{
writeNodeOrRelationshipMeta( out, node.getId(), Neo4jJsonMetaType.node.name(), stateChecker.isNodeDeletedInCurrentTx( node.getId() ) );
}
}
else if ( value instanceof Relationship )
{
Relationship relationship = (Relationship) value;
try ( TransactionStateChecker transactionStateChecker = TransactionStateChecker.create( container ) )
{
writeNodeOrRelationshipMeta( out, relationship.getId(), Neo4jJsonMetaType.relationship.name(),
transactionStateChecker.isRelationshipDeletedInCurrentTx( relationship.getId() ) );
}
}
else if ( value instanceof Path )
{
writeMetaPath( out, (Path) value );
}
else if ( value instanceof Iterable )
{
for ( Object v : (Iterable) value )
{
writeMeta( out, v );
}
}
else if ( value instanceof Map )
{
Map map = (Map) value;
for ( Object key : map.keySet() )
{
writeMeta( out, map.get( key ) );
}
}
else if ( value instanceof Geometry )
{
writeGeometryTypeMeta( out, (Geometry) value );
}
else if ( value instanceof Temporal )
{
writeTemporalTypeMeta( out, (Temporal) value );
}
else if ( value instanceof TemporalAmount )
{
writeTypeMeta( out, Neo4jJsonMetaType.duration.name() );
}
else
{
out.writeNull();
}
}
private void writeGeometryTypeMeta( JsonGenerator out, Geometry value ) throws IOException
{
Neo4jJsonMetaType type = null;
if ( value instanceof PointValue )
{
PointValue p = (PointValue) value;
int size = p.coordinate().length;
if ( size == 2 )
{
type = Neo4jJsonMetaType.point2d;
}
else if ( size == 3 )
{
type = Neo4jJsonMetaType.point3d;
}
}
if ( type == null )
{
throw new IllegalArgumentException(
String.format( "Unsupported Geometry type: type=%s, value=%s", value.getClass().getSimpleName(), value.toString() ) );
}
writeTypeMeta( out, type.name() );
}
private void writeTemporalTypeMeta( JsonGenerator out, Temporal value ) throws IOException
{
Neo4jJsonMetaType type = null;
if ( value instanceof ZonedDateTime )
{
type = Neo4jJsonMetaType.datetime;
}
else if ( value instanceof LocalDate )
{
type = Neo4jJsonMetaType.date;
}
else if ( value instanceof OffsetTime )
{
type = Neo4jJsonMetaType.time;
}
else if ( value instanceof LocalDateTime )
{
type = Neo4jJsonMetaType.localdatetime;
}
else if ( value instanceof LocalTime )
{
type = Neo4jJsonMetaType.localtime;
}
if ( type == null )
{
throw new IllegalArgumentException(
String.format( "Unsupported Temporal type: type=%s, value=%s", value.getClass().getSimpleName(), value.toString() ) );
}
writeTypeMeta( out, type.name() );
}
private void writeMetaPath( JsonGenerator out, Path value ) throws IOException
{
out.writeStartArray();
try
{
for ( PropertyContainer element : value )
{
writeMeta( out, element );
}
}
finally
{
out.writeEndArray();
}
}
private void writeTypeMeta( JsonGenerator out, String type )
throws IOException
{
out.writeStartObject();
try
{
out.writeStringField( "type", type );
}
finally
{
out.writeEndObject();
}
}
private void writeNodeOrRelationshipMeta( JsonGenerator out, long id, String type, boolean isDeleted )
throws IOException
{
out.writeStartObject();
try
{
out.writeNumberField( "id", id );
out.writeStringField( "type", type );
out.writeBooleanField( "deleted", isDeleted );
}
finally
{
out.writeEndObject();
}
}
}