/
ColleaguesCypherExecutionResource.java
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/
ColleaguesCypherExecutionResource.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 java.util.Map;
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.Node;
import org.neo4j.graphdb.Result;
import org.neo4j.graphdb.Transaction;
import org.neo4j.helpers.collection.MapUtil;
//START SNIPPET: ColleaguesCypherExecutionResource
@Path("/colleagues-cypher-execution")
public class ColleaguesCypherExecutionResource
{
private final ObjectMapper objectMapper;
private GraphDatabaseService graphDb;
public ColleaguesCypherExecutionResource( @Context GraphDatabaseService graphDb )
{
this.graphDb = graphDb;
this.objectMapper = new ObjectMapper();
}
@GET
@Path("/{personName}")
public Response findColleagues( final @PathParam("personName") String personName )
{
final Map<String, Object> params = MapUtil.map( "personName", 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();
Result result = graphDb.execute( colleaguesQuery(), params ) )
{
while ( result.hasNext() )
{
Map<String,Object> row = result.next();
jg.writeString( ((Node) row.get( "colleague" )).getProperty( "name" ).toString() );
}
tx.success();
}
jg.writeEndArray();
jg.writeEndObject();
jg.flush();
jg.close();
}
};
return Response.ok().entity( stream ).type( MediaType.APPLICATION_JSON ).build();
}
private String colleaguesQuery()
{
return "MATCH (p:Person {name: {personName} })-[:ACTED_IN]->()<-[:ACTED_IN]-(colleague) RETURN colleague";
}
}
// END SNIPPET: ColleaguesCypherExecutionResource