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ColleaguesResource.java
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ColleaguesResource.java
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/*
* Licensed to Neo Technology under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Neo Technology licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.neo4j.examples.server.unmanaged;
import java.io.IOException;
import java.io.OutputStream;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.StreamingOutput;
import org.codehaus.jackson.JsonEncoding;
import org.codehaus.jackson.JsonGenerator;
import org.codehaus.jackson.map.ObjectMapper;
import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Label;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Relationship;
import org.neo4j.graphdb.RelationshipType;
import org.neo4j.graphdb.ResourceIterator;
import org.neo4j.graphdb.Transaction;
import static org.neo4j.graphdb.Direction.INCOMING;
import static org.neo4j.graphdb.Direction.OUTGOING;
//START SNIPPET: ColleaguesResource
@Path("/colleagues")
public class ColleaguesResource
{
private GraphDatabaseService graphDb;
private final ObjectMapper objectMapper;
private static final RelationshipType ACTED_IN = RelationshipType.withName( "ACTED_IN" );
private static final Label PERSON = Label.label( "Person" );
public ColleaguesResource( @Context GraphDatabaseService graphDb )
{
this.graphDb = graphDb;
this.objectMapper = new ObjectMapper();
}
@GET
@Path("/{personName}")
public Response findColleagues( final @PathParam("personName") String personName )
{
StreamingOutput stream = new StreamingOutput()
{
@Override
public void write( OutputStream os ) throws IOException, WebApplicationException
{
JsonGenerator jg = objectMapper.getJsonFactory().createJsonGenerator( os, JsonEncoding.UTF8 );
jg.writeStartObject();
jg.writeFieldName( "colleagues" );
jg.writeStartArray();
try ( Transaction tx = graphDb.beginTx();
ResourceIterator<Node> persons = graphDb.findNodes( PERSON, "name", personName ) )
{
while ( persons.hasNext() )
{
Node person = persons.next();
for ( Relationship actedIn : person.getRelationships( ACTED_IN, OUTGOING ) )
{
Node endNode = actedIn.getEndNode();
for ( Relationship colleagueActedIn : endNode.getRelationships( ACTED_IN, INCOMING ) )
{
Node colleague = colleagueActedIn.getStartNode();
if ( !colleague.equals( person ) )
{
jg.writeString( colleague.getProperty( "name" ).toString() );
}
}
}
}
tx.success();
}
jg.writeEndArray();
jg.writeEndObject();
jg.flush();
jg.close();
}
};
return Response.ok().entity( stream ).type( MediaType.APPLICATION_JSON ).build();
}
}
// END SNIPPET: ColleaguesResource