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‎.gitignore‎

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*.class
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# Mobile Tools for Java (J2ME)
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.mtj.tmp/
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# Package Files #
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#*.jar
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*.war
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*.ear
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# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
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hs_err_pid*
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# IntelliJ #
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.idea
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*.iml
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# Maven #
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/target
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# MAC Journaling #
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/.DS_Store

‎LICENSE‎

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Apache License
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‎README.md‎

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# Neo4j Kotlin Procedure Example
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This is an example project about Neo4j procedures written in Kotlin.
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Here you can find a Procedure `example.connect` and a User Function `example.concat`.
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The first one will create a relationship with the given type between two given nodes; the second one will concatenate a list of strings with a given delimiter.
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## Installation
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1. Download the latest [release](https://github.com/mfalcier/neo4j-kotlin-procedure-example/releases);
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2. Put the downloaded jar file into `$NEO4J_HOME/plugins` folder;
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3. Start/Restart Neo4j.
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## License
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Apache License V2, see LICENSE

‎pom.xml‎

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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0
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http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>org.neo4j.example</groupId>
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<artifactId>neo4j-kotlin-procedure-example</artifactId>
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<version>1.0.0</version>
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<packaging>jar</packaging>
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<name>Neo4j Kotlin Procedure Example</name>
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<description>A simple example about Neo4j procedures using Kotlin</description>
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<properties>
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<neo4j.version>3.2.1</neo4j.version>
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<kotlin.compiler.incremental>true</kotlin.compiler.incremental>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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<kotlin.version>1.1.2-5</kotlin.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-stdlib-jre8</artifactId>
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<version>${kotlin.version}</version>
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</dependency>
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<dependency>
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<groupId>org.jetbrains.kotlin</groupId>
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<artifactId>kotlin-reflect</artifactId>
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<version>${kotlin.version}</version>
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</dependency>
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<dependency>
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<groupId>org.neo4j</groupId>
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<artifactId>neo4j</artifactId>
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<version>${neo4j.version}</version>
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<scope>provided</scope>
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</dependency>
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<!-- Test Dependencies -->
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<dependency>
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<groupId>org.neo4j.test</groupId>
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<artifactId>neo4j-harness</artifactId>
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<version>${neo4j.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.neo4j.driver</groupId>
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<artifactId>neo4j-java-driver</artifactId>
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<version>1.2.0</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>4.12</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
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<testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>
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<plugins>
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<plugin>
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<artifactId>kotlin-maven-plugin</artifactId>
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<groupId>org.jetbrains.kotlin</groupId>
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<version>${kotlin.version}</version>
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<executions>
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<execution>
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<id>compile</id>
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<goals> <goal>compile</goal> </goals>
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</execution>
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<execution>
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<id>test-compile</id>
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<goals> <goal>test-compile</goal> </goals>
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</execution>
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</executions>
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</plugin>
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<plugin>
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<artifactId>maven-shade-plugin</artifactId>
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<version>2.4.3</version>
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<executions>
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<execution>
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<phase>package</phase>
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<goals>
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<goal>shade</goal>
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</goals>
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</execution>
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</executions>
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</plugin>
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</plugins>
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</build>
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</project>

‎src/main/kotlin/example/Example.kt‎

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package example
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import org.neo4j.graphdb.Node
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import org.neo4j.graphdb.RelationshipType
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import org.neo4j.logging.Log
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import org.neo4j.procedure.*
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class Example {
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@Context
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@JvmField
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var log: Log? = null
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@Procedure(value = "example.connect", mode = Mode.WRITE)
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@Description("Connect 2 nodes with a given relationship type")
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fun connect(@Name("from") from: Node,
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@Name("type") type: String,
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@Name("to") to: Node) {
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from.createRelationshipTo(to, RelationshipType.withName(type))
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log!!.info("Created a new relationship using connect.")
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}
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@UserFunction(value = "example.concat")
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@Description("example.concat(['s1','s2',...], delimiter) - join the given strings with the given delimiter.")
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fun concat(
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@Name("strings") strings: List<String>?,
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@Name("delimiter") delimiter: String?
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): String? {
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if (strings == null || delimiter == null) {
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return null
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}
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var result = ""
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for (string in strings) {
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result += string + delimiter
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}
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return result
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}
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}

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