Cli tools

bin/common.sh

@@ -0,0 +1,55 @@
+#!/bin/sh
+# This script resolves HEFQUIN_HOME, locates the Java binary, and sets 
+# the classpath to point to the correct JAR file.
+
+# Function to resolve symbolic links and return the absolute path of a file
+resolveLink() {
+  local NAME=$1  # Assign the first argument (the file name) to a local variable
+  # Loop to resolve symbolic links until the actual file is found
+  while [ -L "$NAME" ]; do
+    case "$OSTYPE" in
+      # For macOS or BSD systems, resolve the path using dirname and basename
+      darwin*|bsd*) NAME=$(cd "$(dirname "$NAME")" && pwd -P)/$(basename "$NAME") ;;
+      # For Linux and other systems, use readlink to resolve the full path
+      *) NAME=$(readlink -f "$NAME") ;;
+    esac
+  done
+  # Output the resolved absolute path
+  echo "$NAME"
+}
+
+# If HEFQUIN_HOME is not already set, resolve it based on the script's location
+if [ -z "$HEFQUIN_HOME" ]; then
+  # Resolve the absolute path of the current script
+  SCRIPT=$(resolveLink "$0")
+  # Set HEFQUIN_HOME to the parent directory of the script's directory
+  HEFQUIN_HOME=$(cd "$(dirname "$SCRIPT")/.." && pwd)
+  # Export HEFQUIN_HOME so it can be used in child processes
+  export HEFQUIN_HOME
+fi
+
+# If JAVA is not set, locate the Java binary
+if [ -z "$JAVA" ]; then
+  # If JAVA_HOME is set, use it to locate the Java binary
+  if [ -z "$JAVA_HOME" ]; then
+    JAVA=$(which java)  # If JAVA_HOME is not set, fall back to finding java in the system PATH
+  else
+    JAVA="$JAVA_HOME/bin/java"  # Use JAVA_HOME to find the Java binary
+  fi
+fi
+
+# If JAVA is still not set, print an error message and exit the script
+if [ -z "$JAVA" ]; then
+  echo "Cannot find a Java JDK."
+  echo "Please set JAVA or JAVA_HOME and ensure java (>=Java 17) is in your PATH." 1>&2
+  exit 1  # Exit the script with an error code
+fi
+
+# Look for the hefquin-cli JAR file in either HEFQUIN_HOME/libs or HEFQUIN_HOME/hefquin-cli/target/
+if [ -d "${HEFQUIN_HOME}/libs/" ]; then
+  # If the libs directory exists, set HEFQUIN_CP to the hefquin-cli JAR found there
+  HEFQUIN_CP=$(echo ${HEFQUIN_HOME}/libs/hefquin-cli-*.jar)
+else
+  # Otherwise, look for the JAR in the target directory under hefquin-cli
+  HEFQUIN_CP=$(echo ${HEFQUIN_HOME}/hefquin-cli/target/hefquin-cli-*.jar)
+fi

bin/hefquin

@@ -0,0 +1,6 @@
+#!/bin/sh
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source ${SCRIPT_DIR}/common.sh
+
+# Run the Java command
+"$JAVA" $JVM_ARGS -cp $HEFQUIN_CP se.liu.ida.hefquin.cli.RunQueryWithoutSrcSel $@

bin/hefquin-pg

@@ -0,0 +1,6 @@
+#!/bin/sh
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source ${SCRIPT_DIR}/common.sh
+
+# Run the Java command
+"$JAVA" $JVM_ARGS -cp $HEFQUIN_CP se.liu.ida.hefquin.cli.RunBGPOverNeo4j $@

bin/hefquin-pgmat

@@ -0,0 +1,6 @@
+#!/bin/sh
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source ${SCRIPT_DIR}/common.sh
+
+# Run the Java command
+"$JAVA" $JVM_ARGS -cp $HEFQUIN_CP se.liu.ida.hefquin.cli.MaterializeRDFViewOfLPG $@

bin/hefquin-server

@@ -0,0 +1,6 @@
+#!/bin/sh
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )"
+source ${SCRIPT_DIR}/common.sh
+
+# Run the Java command
+"$JAVA" $JVM_ARGS -cp $HEFQUIN_CP se.liu.ida.hefquin.cli.RunHeFQUINServer $@

hefquin-cli/pom.xml

@@ -17,6 +17,12 @@
       <artifactId>hefquin-engine</artifactId>
       <version>0.0.4-SNAPSHOT</version>
     </dependency>
+      <!-- hefquin-service -->
+    <dependency>
+      <groupId>se.liu.ida.hefquin</groupId>
+      <artifactId>hefquin-service</artifactId>
+      <version>0.0.4-SNAPSHOT</version>
+    </dependency>
   </dependencies>
 
   <build>

hefquin-cli/src/main/java/se/liu/ida/hefquin/cli/MaterializeRDFViewOfLPG.java

@@ -20,6 +20,7 @@
 import org.apache.jena.sparql.core.Quad;
 import org.apache.jena.sparql.graph.GraphFactory;
 
+import se.liu.ida.hefquin.cli.modules.ModEndpoint;
 import se.liu.ida.hefquin.cli.modules.ModLPG2RDFConfiguration;
 import se.liu.ida.hefquin.engine.wrappers.lpg.conf.LPG2RDFConfiguration;
 import se.liu.ida.hefquin.engine.wrappers.lpg.conn.Neo4jConnectionFactory;
@@ -47,44 +48,81 @@
 import java.util.List;
 import java.util.zip.GZIPOutputStream;
 
+/**
+ * A command-line tool to materialize an RDF view of a labeled property graph
+ * (LPG) retrieved from a Neo4j endpoint using Cypher queries. This tool takes
+ * various configuration options and outputs RDF data that conforms to a given
+ * LPG-to-RDF configuration.
+ */
 public class MaterializeRDFViewOfLPG extends CmdARQ
 {
+	protected final ModEndpoint modEndpoint = new ModEndpoint();
 	protected final ModTime modTime =            new ModTime();
 	protected final ModLangOutput modLangOut =   new ModLangOutput();
 	protected final ModLPG2RDFConfiguration modLPG2RDFConfiguration = new ModLPG2RDFConfiguration();
 
 	protected final ArgDecl argEndpointURI   = new ArgDecl(ArgDecl.HasValue, "endpoint");
+	protected final ArgDecl argEndpointUsername   = new ArgDecl(ArgDecl.HasValue, "username");
+	protected final ArgDecl argEndpointPassword   = new ArgDecl(ArgDecl.HasValue, "password");
 
-
+	/**
+	 * Main entry point of the tool, accepting command-line arguments to specify the
+	 * Neo4j connection details and output format options.
+	 *
+	 * @param args Command-line arguments.
+	 */
 	public static void main( final String[] args ) {
-		new MaterializeRDFViewOfLPG(args).mainRun();
+		new MaterializeRDFViewOfLPG( args ).mainRun();
 	}
 
+	/**
+	 * Constructor that initializes the command-line tool with necessary argument
+	 * modules for endpoint configuration, output format, and timing options.
+	 *
+	 * @param argv Command-line arguments.
+	 */
 	protected MaterializeRDFViewOfLPG( final String[] argv ) {
 		super(argv);
 
 		addModule(modTime);
 		addModule(modLangOut);
-
 		addModule(modLPG2RDFConfiguration);
-
-		add(argEndpointURI, "--endpoint", "The URI of the Neo4j endpoint");
+		addModule(modEndpoint);
 	}
 
+	/**
+	 * Returns the usage summary string of the command, showing the required and
+	 * optional arguments.
+	 *
+	 * @return A string that describes the usage of the command.
+	 */
 	@Override
 	protected String getSummary() {
-		return getCommandName() + "--endpoint=<Neo4j endpoint URI> --time?";
+		return "Usage: " + getCommandName() + " " + 
+			"--endpoint=<neo4j-endpoint-url> " +
+			"--username=<neo4j-username> " +
+			"--password=<neo4j-password>";
 	}
 
+	/**
+	 * Returns the command name used to invoke the tool.
+	 *
+	 * @return The name of the command.
+	 */
 	@Override
-	protected void exec() {
-		if ( ! hasArg(argEndpointURI) ) {
-			System.err.println( "Error: URI of Neo4j endpoint not specified.");
-			System.err.println( "       Specify it using the --" + argEndpointURI.getKeyName() + " argument.");
-			return;
-		}
+	protected String getCommandName() {
+		return "hefquin-pgmat";
+	}
 
-		final String neo4jEndpointURI = getArg(argEndpointURI).getValue();
+	/**
+	 * Retrieves nodes and edges from a Neo4j database, converts them to RDF
+	 * triples, and writes the triples to the output stream System.out.
+	 */
+	@Override
+	protected void exec() {
+		final String neo4jEndpointURI = getArg( "endpoint" ).getValue();
+		final String neo4jUsername = getArg( "username" ) != null ? getArg( "username" ).getValue() : null;
+		final String neo4jPassword = getArg( "password" ) != null ? getArg( "password" ).getValue() : null;
 
 		final LPG2RDFConfiguration l2rConf = modLPG2RDFConfiguration.getLPG2RDFConfiguration();
 
@@ -100,10 +138,16 @@ protected void exec() {
 			modTime.startTimer();
 		}
 
-		final List<TableRecord> nodesResponse = execQuery(getNodesQuery, neo4jEndpointURI);
+		final List<TableRecord> nodesResponse = execQuery( getNodesQuery,
+		                                                   neo4jEndpointURI,
+		                                                   neo4jUsername,
+		                                                   neo4jPassword );
 		writeTriplesForNodes(nodesResponse, l2rConf, rdfOutStream);
 
-		final List<TableRecord>  edgesResponse = execQuery(getEdgesQuery, neo4jEndpointURI);
+		final List<TableRecord>  edgesResponse = execQuery( getEdgesQuery,
+		                                                    neo4jEndpointURI,
+		                                                    neo4jUsername,
+		                                                    neo4jPassword );
 		writeTriplesForEdges(edgesResponse, l2rConf, rdfOutStream);
 
 		rdfOutStream.finish();
@@ -114,6 +158,12 @@ protected void exec() {
 		}
 	}
 
+	/**
+	 * Builds and returns the Cypher query used to retrieve nodes from the Neo4j
+	 * database.
+	 *
+	 * @return A CypherQuery for retrieving nodes.
+	 */
 	public CypherQuery buildGetNodesQuery() {
 		// MATCH (n)
 		// RETURN n AS node, HEAD(LABELS(n)) AS label
@@ -130,6 +180,12 @@ public CypherQuery buildGetNodesQuery() {
 				.build();
 	}
 
+	/**
+	 * Builds and returns the Cypher query used to retrieve edges from the Neo4j
+	 * database.
+	 *
+	 * @return A CypherQuery for retrieving edges.
+	 */
 	public CypherQuery buildGetEdgesQuery() {
 		// MATCH (n1)-[e]->(n2)
 		// RETURN ID(n1) AS nid1, ID(n2) AS nid2, e AS edge, TYPE(e) AS reltype
@@ -152,10 +208,23 @@ public CypherQuery buildGetEdgesQuery() {
 				.build();
 	}
 
+	/**
+	 * Executes the given Cypher query against the Neo4j database using the provided
+	 * connection details.
+	 *
+	 * @param query                 The Cypher query to be executed.
+	 * @param neo4jEndpointURI      The URI of the Neo4j endpoint.
+	 * @param neo4jEndpointUsername The username for the Neo4j endpoint.
+	 * @param neo4jEndpointPassword The password for the Neo4j endpoint.
+	 * @return A list of table records containing the results of the query.
+	 */
 	protected List<TableRecord> execQuery( final CypherQuery query,
-	                                       final String neo4jEndpointURI ) {
-		final Neo4jConnection conn = Neo4jConnectionFactory.connect(neo4jEndpointURI);
-
+	                                       final String neo4jEndpointURI,
+	                                       final String neo4jEndpointUsername,
+	                                       final String neo4jEndpointPassword ) {
+		final Neo4jConnection conn = Neo4jConnectionFactory.connect( neo4jEndpointURI,
+		                                                             neo4jEndpointUsername,
+		                                                             neo4jEndpointPassword );
 		final List<TableRecord> result;
 		try {
 			result = conn.execute(query);
@@ -172,6 +241,14 @@ protected List<TableRecord> execQuery( final CypherQuery query,
 		return result;
 	}
 
+	/**
+	 * Writes RDF triples representing the nodes retrieved from the Neo4j database
+	 * to the provided stream.
+	 *
+	 * @param nodesResponse The list of table records containing the nodes.
+	 * @param lpg2rdfConf   The LPG-to-RDF configuration used for conversion.
+	 * @param rdfOutStream  The output stream to write the RDF triples to.
+	 */
 	protected void writeTriplesForNodes( final List<TableRecord> nodesResponse,
 	                                     final LPG2RDFConfiguration l2rConf,
 	                                     final StreamRDF rdfOutStream ) {
@@ -202,6 +279,14 @@ protected void writeTriplesForNodes( final List<TableRecord> nodesResponse,
 		}
 	}
 
+	/**
+	 * Writes RDF triples representing the edges retrieved from the Neo4j database
+	 * to the provided stream.
+	 *
+	 * @param edgesResponse The list of table records containing the edges.
+	 * @param lpg2rdfConf   The LPG-to-RDF configuration used for conversion.
+	 * @param rdfOutStream  The output stream to write the RDF triples to.
+	 */
 	protected void writeTriplesForEdges( final List<TableRecord> edgesResponse,
 	                                     final LPG2RDFConfiguration l2rConf,
 	                                     final StreamRDF rdfOutStream ) {
@@ -271,6 +356,15 @@ protected void writeTriplesForProperties( final Node subject,
 		}
 	}
 
+	/**
+	 * Sets up the output stream for writing RDF data. If the output should be
+	 * compressed, a GZIP stream is created. The RDF format for output is determined
+	 * by the configuration.
+	 *
+	 * @param outStreamBase The base output stream (e.g., System.out).
+	 * @return The StreamRDF configured for the appropriate RDF format and
+	 *         compression.
+	 */
 	protected StreamRDF setupOutputStream( final OutputStream outStreamBase ) {
 		final OutputStream outStream;
 		if ( modLangOut.compressedOutput() ) {