https://github.com/opensourceBIM/IfcPlugins/issues/8

IfcPlugins/pom.xml

@@ -157,7 +157,7 @@
 		<dependency>
 			<groupId>org.opensourcebim</groupId>
 			<artifactId>shared</artifactId>
-			<version>1.5.82-SNAPSHOT</version>
+			<version>1.5.86-SNAPSHOT</version>
 		</dependency>
 		<dependency>
 			<groupId>ch.qos.logback</groupId>

IfcPlugins/src/org/bimserver/ifc/step/serializer/Ifc2x3tc1StepSerializer.java

@@ -19,7 +19,6 @@
 
 import org.bimserver.emf.IfcModelInterface;
 import org.bimserver.plugins.PluginConfiguration;
-import org.bimserver.plugins.PluginManagerInterface;
 import org.bimserver.plugins.serializers.ProjectInfo;
 import org.bimserver.plugins.serializers.SerializerException;
 

IfcPlugins/test/org/bimserver/test/TestReadAddWrite.java

@@ -0,0 +1,80 @@
+package org.bimserver.test;
+
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.nio.file.Paths;
+
+import org.apache.commons.io.IOUtils;
+import org.bimserver.emf.IfcModelInterface;
+import org.bimserver.emf.IfcModelInterfaceException;
+import org.bimserver.emf.PackageMetaData;
+import org.bimserver.emf.Schema;
+import org.bimserver.ifc.step.deserializer.Ifc2x3tc1StepDeserializer;
+import org.bimserver.ifc.step.serializer.Ifc2x3tc1StepSerializer;
+import org.bimserver.models.ifc2x3tc1.Ifc2x3tc1Package;
+import org.bimserver.models.ifc2x3tc1.IfcBuilding;
+import org.bimserver.models.ifc2x3tc1.IfcElementQuantity;
+import org.bimserver.models.ifc2x3tc1.IfcQuantityVolume;
+import org.bimserver.models.ifc2x3tc1.IfcRelDefinesByProperties;
+import org.bimserver.plugins.PluginConfiguration;
+import org.bimserver.plugins.deserializers.DeserializeException;
+import org.bimserver.plugins.serializers.SerializerException;
+import org.junit.Test;
+
+public class TestReadAddWrite {
+	@Test
+	public void test() {
+		Ifc2x3tc1StepDeserializer deserializer = new Ifc2x3tc1StepDeserializer();
+		PackageMetaData packageMetaData = new PackageMetaData(Ifc2x3tc1Package.eINSTANCE, Schema.IFC2X3TC1, Paths.get("tmp"));
+		deserializer.init(packageMetaData);
+
+		try {
+			URL url = new URL("https://raw.githubusercontent.com/opensourceBIM/IFC-files/master/HHS%20Office/construction.ifc");
+			InputStream openStream = url.openStream();
+			ByteArrayOutputStream baos = new ByteArrayOutputStream();
+			IOUtils.copy(openStream, baos);
+			IfcModelInterface model = deserializer.read(new ByteArrayInputStream(baos.toByteArray()), "", baos.size(), null);
+
+			// This is needed so we start with a clean slate of express id's
+			model.resetExpressIds();
+
+			// This is needed so we continue counting at highest already existing oid
+			model.fixOidCounter();
+
+			for (IfcBuilding building : model.getAllWithSubTypes(IfcBuilding.class)) {
+				try {
+					// Use createAndAdd to actually add the object to the model
+					IfcQuantityVolume g_volume = model.createAndAdd(IfcQuantityVolume.class);
+					g_volume.setName("Test Quantity");
+					g_volume.setVolumeValue(1000000000);
+
+					IfcElementQuantity el_gv = model.createAndAdd(IfcElementQuantity.class);
+					el_gv.getQuantities().add(g_volume);
+
+					IfcRelDefinesByProperties ifcRelDefinesByProperties1 = model.createAndAdd(IfcRelDefinesByProperties.class);
+					ifcRelDefinesByProperties1.setRelatingPropertyDefinition(el_gv);
+					ifcRelDefinesByProperties1.getRelatedObjects().add(building);
+					building.getIsDefinedBy().add(ifcRelDefinesByProperties1);
+				} catch (IfcModelInterfaceException e) {
+					e.printStackTrace();
+				}
+			}
+
+			Ifc2x3tc1StepSerializer serializer = new Ifc2x3tc1StepSerializer(new PluginConfiguration());
+			serializer.init(model, null, true); // Put "true" as the last argument in order to generate new express id's
+			serializer.writeToFile(Paths.get("output.ifc"), null);
+		} catch (MalformedURLException e) {
+			e.printStackTrace();
+		} catch (IOException e) {
+			e.printStackTrace();
+		} catch (DeserializeException e) {
+			e.printStackTrace();
+		} catch (SerializerException e) {
+			e.printStackTrace();
+		}
+	}
+}