Convert modules and relations to SVG

Generate SVG image from modules chain and save it to DB.

Change-Id: I0f0b065f82de9b4d2084ec51043f485401842e23
Issue-ID: CLAMP-284
Signed-off-by: Piotr Darosz <piotr.darosz@nokia.com>

17 files changed, 955 insertions, 6 deletions

diff --git a/src/main/java/org/onap/clamp/clds/sdc/controller/installer/CsarInstallerImpl.java b/src/main/java/org/onap/clamp/clds/sdc/controller/installer/CsarInstallerImpl.java
index 1303f2abd..17739963e 100644
--- a/src/main/java/org/onap/clamp/clds/sdc/controller/installer/CsarInstallerImpl.java
+++ b/src/main/java/org/onap/clamp/clds/sdc/controller/installer/CsarInstallerImpl.java
@@ -26,19 +26,16 @@ package org.onap.clamp.clds.sdc.controller.installer;
 import com.att.eelf.configuration.EELFLogger;
 import com.att.eelf.configuration.EELFManager;
 import com.google.gson.JsonObject;
-
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
 import java.util.Map.Entry;
-
 import java.util.Optional;
 import java.util.Set;
 import javax.annotation.PostConstruct;
 import javax.xml.transform.TransformerException;
-
 import org.apache.commons.io.IOUtils;
 import org.json.simple.parser.ParseException;
 import org.onap.clamp.clds.client.DcaeInventoryServices;
@@ -55,6 +52,7 @@ import org.onap.clamp.clds.service.CldsService;
 import org.onap.clamp.clds.service.CldsTemplateService;
 import org.onap.clamp.clds.transform.XslTransformer;
 import org.onap.clamp.clds.util.JsonUtils;
+import org.onap.clamp.clds.util.drawing.SvgFacade;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.context.ApplicationContext;
@@ -99,6 +97,9 @@ public class CsarInstallerImpl implements CsarInstaller {
     @Autowired
     private ChainGenerator chainGenerator;
 
+    @Autowired
+    private SvgFacade svgFacade;
+
     @PostConstruct
     public void loadConfiguration() throws IOException {
         BlueprintParserMappingConfiguration
@@ -255,7 +256,7 @@ public class CsarInstallerImpl implements CsarInstaller {
         if(microServicesChain.isEmpty()) {
             microServicesChain = blueprintParser.fallbackToOneMicroService(blueprintArtifact.getDcaeBlueprint());
         }
-        //place where SVG text will be generated
+        String imageText = svgFacade.getSvgImage(microServicesChain);
 
         CldsTemplate template = new CldsTemplate();
         template.setBpmnId("Sdc-Generated");
@@ -264,7 +265,7 @@ public class CsarInstallerImpl implements CsarInstaller {
         template.setPropText(
             "{\"global\":[{\"name\":\"service\",\"value\":[\"" + blueprintArtifact.getDcaeBlueprint() + "\"]}]}");
         template
-            .setImageText(IOUtils.toString(appContext.getResource(configFiles.getSvgXmlFilePath()).getInputStream()));
+            .setImageText(imageText);
         template.setName(TEMPLATE_NAME_PREFIX + buildModelName(csar, blueprintArtifact));
         template.save(cldsDao, null);
         logger.info("Fake Clds Template created for blueprint " + blueprintArtifact.getBlueprintArtifactName()
diff --git a/src/main/java/org/onap/clamp/clds/transform/XslTransformer.java b/src/main/java/org/onap/clamp/clds/transform/XslTransformer.java
index 5886e019f..a8f233e43 100644
--- a/src/main/java/org/onap/clamp/clds/transform/XslTransformer.java
+++ b/src/main/java/org/onap/clamp/clds/transform/XslTransformer.java
@@ -23,6 +23,7 @@
 
 package org.onap.clamp.clds.transform;
 
+import com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl;
 import java.io.StringReader;
 import java.io.StringWriter;
 
@@ -45,7 +46,7 @@ public class XslTransformer {
     private Templates templates;
 
     public void setXslResourceName(String xslResourceName) throws TransformerConfigurationException {
-        TransformerFactory tfactory = TransformerFactory.newInstance();
+        TransformerFactory tfactory = new TransformerFactoryImpl();
         tfactory.setAttribute(XMLConstants.ACCESS_EXTERNAL_DTD, "");
         tfactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
         templates = tfactory.newTemplates(new StreamSource(ResourceFileUtil.getResourceAsStream(xslResourceName)));
diff --git a/src/main/java/org/onap/clamp/clds/util/XmlTools.java b/src/main/java/org/onap/clamp/clds/util/XmlTools.java
new file mode 100644
index 000000000..391f0087d
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/XmlTools.java
@@ -0,0 +1,57 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util;
+
+import java.io.StringWriter;
+import javax.xml.transform.OutputKeys;
+import javax.xml.transform.Transformer;
+import javax.xml.transform.TransformerException;
+import javax.xml.transform.TransformerFactory;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.transform.stream.StreamResult;
+import org.apache.batik.anim.dom.SVGDOMImplementation;
+import org.apache.batik.dom.GenericDOMImplementation;
+import org.apache.batik.util.SVGConstants;
+import org.w3c.dom.DOMImplementation;
+import org.w3c.dom.Document;
+
+public class XmlTools {
+    public static String exportXmlDocumentAsString(Document doc) {
+        try {
+            TransformerFactory tf = TransformerFactory.newInstance();
+            Transformer transformer = tf.newTransformer();
+            transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "yes");
+            StringWriter writer = new StringWriter();
+            transformer.transform(new DOMSource(doc), new StreamResult(writer));
+            return writer.getBuffer().toString();
+        } catch (TransformerException e) {
+            throw new RuntimeException(e);
+        }
+    }
+    public static Document createEmptySvgDocument() {
+        DOMImplementation domImplementation = GenericDOMImplementation.getDOMImplementation();
+        String svgNS = SVGDOMImplementation.SVG_NAMESPACE_URI;
+        return domImplementation.createDocument(svgNS, SVGConstants.SVG_SVG_TAG, null);
+    }
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/AwtUtils.java b/src/main/java/org/onap/clamp/clds/util/drawing/AwtUtils.java
new file mode 100755
index 000000000..f746ab142
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/AwtUtils.java
@@ -0,0 +1,71 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.awt.Color;
+import java.awt.Font;
+import java.awt.FontMetrics;
+import java.awt.Graphics2D;
+import java.awt.Point;
+import java.awt.Rectangle;
+
+public class AwtUtils {
+    private static final int ARROW_W = 4;
+    private static final int ARROW_H = 2;
+    private static final  int FONT_SIZE = 12;
+    private static final  int FONT_STYLE = Font.PLAIN;
+    private static final String FONT_FACE = "SansSerif";
+    private static final Color TRANSPARENT = new Color(0.0f, 0.0f,0.0f,0.0f);
+
+    static void rectWithText(Graphics2D g2d, String text, Point p, int w, int h) {
+        Rectangle rect = new Rectangle(p.x, p.y, w, h);
+        g2d.draw(rect);
+        Color oldColor = g2d.getColor();
+        g2d.setColor(TRANSPARENT);
+        g2d.fill(rect);
+        g2d.setColor(oldColor);
+        addText(g2d, text, p.x+w/2, p.y+h/2);
+    }
+
+    static void drawArrow(Graphics2D g2d, Point from, Point to, int lineThickness) {
+        int x2 = to.x - lineThickness;
+        g2d.drawLine(from.x, from.y, x2-lineThickness, to.y);
+        g2d.drawPolygon(new int[] {x2-ARROW_W, x2-ARROW_W, x2},new int[] {to.y- ARROW_H, to.y+ ARROW_H, to.y},3);
+        g2d.fillPolygon(new int[] {x2-ARROW_W, x2-ARROW_W, x2},new int[] {to.y- ARROW_H, to.y+ ARROW_H, to.y},3);
+    }
+
+    private static void addText(Graphics2D g2d, String text, int x, int y) {
+        Font f = new Font(FONT_FACE, FONT_STYLE, FONT_SIZE);
+        g2d.setFont(f);
+
+        FontMetrics fm1 = g2d.getFontMetrics();
+        int w1 = fm1.stringWidth(text);
+        int x1 = x - (w1 / 2);
+
+        g2d.setFont(f);
+        g2d.setColor(Color.BLACK);
+        g2d.drawString(text, x1, y);
+    }
+
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraph.java b/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraph.java
new file mode 100755
index 000000000..f49e735eb
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraph.java
@@ -0,0 +1,43 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.util.Objects;
+import org.onap.clamp.clds.util.XmlTools;
+
+public class ClampGraph {
+    private final DocumentBuilder documentBuilder;
+    private String svg;
+
+    ClampGraph(DocumentBuilder documentBuilder) {
+        this.documentBuilder = documentBuilder;
+    }
+
+    public String getAsSVG() {
+        if(Objects.isNull(svg) || svg.isEmpty()) {
+            svg = XmlTools.exportXmlDocumentAsString(this.documentBuilder.getGroupingDocument());
+        }
+        return svg;
+    }
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilder.java b/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilder.java
new file mode 100755
index 000000000..243cb4aad
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilder.java
@@ -0,0 +1,64 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+public class ClampGraphBuilder {
+    private String policy;
+    private String collector;
+    private List<String> microServices = new ArrayList<>();
+    private final Painter painter;
+
+    public ClampGraphBuilder(Painter painter) {
+        this.painter = painter;
+    }
+
+    public ClampGraphBuilder collector(String c) {
+        collector = c;
+        return this;
+    }
+
+    public ClampGraphBuilder policy(String p) {
+        policy = p;
+        return this;
+    }
+
+    public ClampGraphBuilder microService(String ms) {
+        microServices.add(ms);
+        return this;
+    }
+
+    public ClampGraph build() {
+        if(microServices.isEmpty()) {
+            throw new InvalidStateException("At least one microservice is required");
+        }
+        if(Objects.isNull(policy) || policy.trim().isEmpty()) {
+            throw new InvalidStateException("Policy element must be present");
+        }
+        return new ClampGraph(painter.doPaint(collector, microServices, policy));
+    }
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/DocumentBuilder.java b/src/main/java/org/onap/clamp/clds/util/drawing/DocumentBuilder.java
new file mode 100644
index 000000000..f34eaf2ee
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/DocumentBuilder.java
@@ -0,0 +1,55 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import org.apache.batik.svggen.SVGGraphics2D;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+
+public class DocumentBuilder {
+    private final Document groupingDocument;
+    private final Document documentFactory;
+
+    static final String DATA_ELEMENT_ID_ATTRIBUTE = "data-element-id";
+
+    DocumentBuilder(Document groupingDocument, Document documentFactory) {
+        this.groupingDocument = groupingDocument;
+        this.documentFactory = documentFactory;
+    }
+
+    void pushChangestoDocument(SVGGraphics2D g2d, String dataElementId) {
+        Element element =
+            this.documentFactory.createElementNS(SVGGraphics2D.SVG_NAMESPACE_URI,
+                SVGGraphics2D.SVG_G_TAG);
+        element.setAttribute(DATA_ELEMENT_ID_ATTRIBUTE, dataElementId);
+        g2d.getRoot(element);
+        Node node = this.groupingDocument.importNode(element, true);
+        this.groupingDocument.getDocumentElement().appendChild(node);
+    }
+
+    Document getGroupingDocument() {
+        return groupingDocument;
+    }
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/ImageBuilder.java b/src/main/java/org/onap/clamp/clds/util/drawing/ImageBuilder.java
new file mode 100644
index 000000000..4d76581c3
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/ImageBuilder.java
@@ -0,0 +1,135 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.awt.BasicStroke;
+import java.awt.Point;
+import java.awt.Shape;
+import java.awt.Stroke;
+import java.awt.geom.Ellipse2D;
+import java.util.UUID;
+import org.apache.batik.svggen.SVGGraphics2D;
+
+public class ImageBuilder {
+
+    public static final int POLICY_LINE_RATIO = 2;
+    public static final int COLLECTOR_LINE_RATIO = 6;
+    public static final float MS_LINE_TO_HEIGHT_RATIO = 0.75f;
+
+    private Point currentPoint;
+    private final int baseLength;
+    private final int rectHeight;
+    private final SVGGraphics2D g2d;
+    private final DocumentBuilder documentBuilder;
+
+    private static final int LINE_THICKNESS = 2;
+    private static final int CIRCLE_RADIUS = 17;
+
+    ImageBuilder(SVGGraphics2D svgGraphics2D, DocumentBuilder documentBuilder,
+            Point startingPoint, int baseLength, int rectHeight) {
+        this.g2d = svgGraphics2D;
+        this.documentBuilder = documentBuilder;
+        this.currentPoint = new Point(startingPoint);
+        this.baseLength = baseLength;
+        this.rectHeight = rectHeight;
+    }
+
+    ImageBuilder rectangle(String dataElementId, RectTypes rectType, String text) {
+        Point next = new Point(currentPoint.x + baseLength, currentPoint.y);
+        Point p = coordinatesForRectangle(currentPoint, next);
+
+        handleBasedOnRectType(rectType, text, p, baseLength, rectHeight);
+
+        documentBuilder.pushChangestoDocument(g2d, dataElementId);
+        currentPoint = next;
+        return this;
+    }
+
+    ImageBuilder arrow() {
+        String dataElementId = "Arrow-" + UUID.randomUUID().toString();
+        Point to = new Point(currentPoint.x + baseLength, currentPoint.y);
+        AwtUtils.drawArrow(g2d, currentPoint, to, LINE_THICKNESS);
+        documentBuilder.pushChangestoDocument(g2d, dataElementId);
+        currentPoint = to;
+        return this;
+    }
+
+    ImageBuilder circle(String dataElementId, int lineThickness) {
+        Point to = new Point(currentPoint.x + 2 * CIRCLE_RADIUS, currentPoint.y);
+        Shape circleStart =
+            new Ellipse2D.Double(currentPoint.x, currentPoint.y - CIRCLE_RADIUS,
+                2 * CIRCLE_RADIUS, 2 * CIRCLE_RADIUS);
+
+        Stroke oldStroke = g2d.getStroke();
+        g2d.setStroke(new BasicStroke(lineThickness));
+        g2d.draw(circleStart);
+        g2d.setStroke(oldStroke);
+        documentBuilder.pushChangestoDocument(g2d, dataElementId);
+        currentPoint = to;
+        return this;
+    }
+
+    DocumentBuilder getDocumentBuilder() {
+        return documentBuilder;
+    }
+
+    private void handleBasedOnRectType(RectTypes rectType, String text, Point p, int w, int h) {
+        AwtUtils.rectWithText(g2d, text, p, w, h);
+        switch (rectType) {
+            case COLECTOR:
+                drawVerticalLineForCollector(p, w, h);
+                break;
+            case MICROSERVICE:
+                drawHorizontalLineForMicroService(p, w, h);
+                break;
+            case POLICY:
+                drawDiagonalLineForPolicy(p, w, h);
+                break;
+        }
+    }
+
+    private void drawVerticalLineForCollector(Point p, int w, int h) {
+        g2d.drawLine(p.x + w / COLLECTOR_LINE_RATIO, p.y, p.x + w / COLLECTOR_LINE_RATIO, p.y + h);
+    }
+
+    private void drawHorizontalLineForMicroService(Point p, int w, int h) {
+        int y = calculateMsHorizontalLineYCoordinate(p,h);
+        g2d.drawLine(p.x, y, p.x + w, y);
+    }
+
+    private void drawDiagonalLineForPolicy(Point p, int w, int h) {
+        g2d.drawLine(p.x, p.y + h / POLICY_LINE_RATIO, p.x + w / POLICY_LINE_RATIO, p.y);
+    }
+
+    private int calculateMsHorizontalLineYCoordinate(Point p, int h) {
+        return (int)(p.y * h * MS_LINE_TO_HEIGHT_RATIO);
+    }
+
+    private Point coordinatesForRectangle(Point from, Point next) {
+        int x = from.x;
+        int y = from.y - next.y + LINE_THICKNESS / 2;
+        return new Point(x,y);
+    }
+
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/InvalidStateException.java b/src/main/java/org/onap/clamp/clds/util/drawing/InvalidStateException.java
new file mode 100644
index 000000000..91af9f1a4
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/InvalidStateException.java
@@ -0,0 +1,30 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+public class InvalidStateException extends RuntimeException {
+    public InvalidStateException(String message) {
+        super(message);
+    }
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/Painter.java b/src/main/java/org/onap/clamp/clds/util/drawing/Painter.java
new file mode 100755
index 000000000..e41ca8fb3
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/Painter.java
@@ -0,0 +1,91 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.awt.BasicStroke;
+import java.awt.Color;
+import java.awt.Point;
+import java.awt.RenderingHints;
+import java.util.List;
+import org.apache.batik.svggen.SVGGraphics2D;
+
+public class Painter {
+    private final int canvasSize;
+    private final SVGGraphics2D g2d;
+    private final DocumentBuilder documentBuilder;
+
+    private static final int DEFALUT_CANVAS_SIZE = 900;
+    private static final int SLIM_LINE = 2;
+    private static final int THICK_LINE = 4;
+    private static final double RECT_RATIO = 3.0 / 2.0;
+    private static final int CIRCLE_RADIUS = 17;
+
+    public Painter(SVGGraphics2D svgGraphics2D, DocumentBuilder documentBuilder) {
+        this.g2d = svgGraphics2D;
+        this.documentBuilder = documentBuilder;
+        this.canvasSize = DEFALUT_CANVAS_SIZE;
+    }
+
+    DocumentBuilder doPaint(String collector, List<String> microServices, String policy) {
+        int numOfRectangles = 2 + microServices.size();
+        int numOfArrows = numOfRectangles + 1;
+        int baseLength = (canvasSize - 2 * CIRCLE_RADIUS) / (numOfArrows + numOfRectangles);
+        int rectHeight = (int) (baseLength / RECT_RATIO);
+
+        adjustGraphics2DProperties();
+
+        Point origin = new Point(0, rectHeight / 2);
+        ImageBuilder ib = new ImageBuilder(g2d, documentBuilder, origin, baseLength, rectHeight);
+
+        doTheActualDrawing(collector, microServices, policy, ib);
+
+        return ib.getDocumentBuilder();
+    }
+
+    private void doTheActualDrawing(String collector, List<String> microServices, String policy, ImageBuilder ib) {
+        ib.circle("start-circle", SLIM_LINE)
+            .arrow()
+            .rectangle(collector, RectTypes.COLECTOR, collector);
+
+        for(String ms : microServices) {
+            ib.arrow().rectangle(ms, RectTypes.MICROSERVICE, ms);
+        }
+
+        ib.arrow()
+            .rectangle(policy, RectTypes.POLICY, policy)
+            .arrow()
+            .circle("stop-circle", THICK_LINE);
+    }
+
+    private void adjustGraphics2DProperties() {
+        g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS,
+            RenderingHints.VALUE_FRACTIONALMETRICS_ON);
+        g2d.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
+            RenderingHints.VALUE_TEXT_ANTIALIAS_LCD_HRGB);
+        g2d.setStroke(new BasicStroke(SLIM_LINE));
+        g2d.setPaint(Color.BLACK);
+    }
+
+
+}
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/RectTypes.java b/src/main/java/org/onap/clamp/clds/util/drawing/RectTypes.java
new file mode 100644
index 000000000..e69324325
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/RectTypes.java
@@ -0,0 +1,28 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+enum RectTypes {
+    COLECTOR, MICROSERVICE, POLICY
+}
\ No newline at end of file
diff --git a/src/main/java/org/onap/clamp/clds/util/drawing/SvgFacade.java b/src/main/java/org/onap/clamp/clds/util/drawing/SvgFacade.java
new file mode 100644
index 000000000..0ba848639
--- /dev/null
+++ b/src/main/java/org/onap/clamp/clds/util/drawing/SvgFacade.java
@@ -0,0 +1,48 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import java.util.List;
+import org.apache.batik.svggen.SVGGraphics2D;
+import org.onap.clamp.clds.sdc.controller.installer.MicroService;
+import org.onap.clamp.clds.util.XmlTools;
+import org.springframework.stereotype.Component;
+import org.w3c.dom.Document;
+
+@Component
+public class SvgFacade {
+    public String getSvgImage(List<MicroService> microServicesChain) {
+        SVGGraphics2D svgGraphics2D = new SVGGraphics2D(XmlTools.createEmptySvgDocument());
+        Document document = XmlTools.createEmptySvgDocument();
+        DocumentBuilder dp = new DocumentBuilder(document, svgGraphics2D.getDOMFactory());
+        Painter p = new Painter(svgGraphics2D, dp);
+        ClampGraphBuilder cgp = new ClampGraphBuilder(p).collector("VES");
+        for(MicroService ms : microServicesChain) {
+            cgp = cgp.microService(ms.getName());
+        }
+        ClampGraph cg = cgp.policy("Policy").build();
+        return cg.getAsSVG();
+    }
+
+}
diff --git a/src/test/java/org/onap/clamp/clds/util/XmlToolsTest.java b/src/test/java/org/onap/clamp/clds/util/XmlToolsTest.java
new file mode 100644
index 000000000..4351a80d4
--- /dev/null
+++ b/src/test/java/org/onap/clamp/clds/util/XmlToolsTest.java
@@ -0,0 +1,72 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util;
+
+import java.io.IOException;
+import java.io.StringReader;
+import javax.xml.parsers.DocumentBuilder;
+import javax.xml.parsers.DocumentBuilderFactory;
+import javax.xml.parsers.ParserConfigurationException;
+import org.apache.batik.anim.dom.SVGDOMImplementation;
+import org.apache.batik.util.SVGConstants;
+import org.junit.Assert;
+import org.junit.Test;
+import org.w3c.dom.Document;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+public class XmlToolsTest {
+
+    @Test
+    public void exportXmlDocumentAsStringTest() throws IOException, ParserConfigurationException, SAXException {
+        String expected = ResourceFileUtil.getResourceAsString("clds/util/file.xml");
+        Document document = parseStringToXmlDocument(expected);
+        String actual = XmlTools.exportXmlDocumentAsString(document);
+        Assert.assertEquals(expected.trim(), actual.trim());
+    }
+
+    @Test
+    public void createEmptySvgDocumentTest() {
+        Document doc = XmlTools.createEmptySvgDocument();
+        Assert.assertEquals(SVGDOMImplementation.SVG_NAMESPACE_URI, doc.getDocumentElement().getNamespaceURI());
+        Assert.assertEquals(SVGConstants.SVG_SVG_TAG, doc.getDocumentElement().getNodeName());
+        Assert.assertNull(doc.getDoctype());
+    }
+
+
+    public static Document parseStringToXmlDocument(String res)
+        throws ParserConfigurationException, SAXException, IOException {
+        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
+        dbf.setValidating(false);
+        dbf.setNamespaceAware(true);
+        dbf.setFeature("http://xml.org/sax/features/namespaces", false);
+        dbf.setFeature("http://xml.org/sax/features/validation", false);
+        dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-dtd-grammar", false);
+        dbf.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
+        DocumentBuilder db = dbf.newDocumentBuilder();
+        InputSource is = new InputSource(new StringReader(res));
+        return db.parse(is);
+    }
+
+}
\ No newline at end of file
diff --git a/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilderTest.java b/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilderTest.java
new file mode 100644
index 000000000..477e6a73f
--- /dev/null
+++ b/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphBuilderTest.java
@@ -0,0 +1,90 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+
+import java.util.Arrays;
+import java.util.List;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.ArgumentCaptor;
+import org.mockito.Captor;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ClampGraphBuilderTest {
+    @Mock
+    private Painter mockPainter;
+
+    @Captor
+    private ArgumentCaptor<String> collectorCaptor;
+
+    @Captor
+    private ArgumentCaptor<List<String>> microServicesCaptor;
+
+    @Captor
+    private ArgumentCaptor<String> policyCaptor;
+
+    @Test
+    public void clampGraphBuilderCompleteChainTest() {
+        String collector = "VES";
+        String ms1 = "ms1";
+        String ms2 = "ms2";
+        String policy = "Policy";
+        List<String> microServices = Arrays.asList(ms1, ms2);
+
+        ClampGraphBuilder clampGraphBuilder = new ClampGraphBuilder(mockPainter);
+        clampGraphBuilder.collector(collector).microService(ms1).microService(ms2).policy(policy).build();
+
+        verify(mockPainter, times(1))
+            .doPaint(collectorCaptor.capture(), microServicesCaptor.capture(), policyCaptor.capture());
+
+        Assert.assertEquals(collector, collectorCaptor.getValue());
+        Assert.assertEquals(microServices, microServicesCaptor.getValue());
+        Assert.assertEquals(policy, policyCaptor.getValue());
+    }
+
+    @Test(expected = InvalidStateException.class)
+    public void clampGraphBuilderNoPolicyGivenTest() {
+        String collector = "VES";
+        String ms1 = "ms1";
+        String ms2 = "ms2";
+
+        ClampGraphBuilder clampGraphBuilder = new ClampGraphBuilder(mockPainter);
+        clampGraphBuilder.collector(collector).microService(ms1).microService(ms2).build();
+    }
+
+    @Test(expected = InvalidStateException.class)
+    public void clampGraphBuilderNoMicroServiceGivenTest() {
+        String collector = "VES";
+        String policy = "Policy";
+
+        ClampGraphBuilder clampGraphBuilder = new ClampGraphBuilder(mockPainter);
+        clampGraphBuilder.collector(collector).policy(policy).build();
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphTest.java b/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphTest.java
new file mode 100644
index 000000000..6bbebdfde
--- /dev/null
+++ b/src/test/java/org/onap/clamp/clds/util/drawing/ClampGraphTest.java
@@ -0,0 +1,77 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.verifyNoMoreInteractions;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+import javax.xml.parsers.ParserConfigurationException;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.onap.clamp.clds.util.ResourceFileUtil;
+import org.onap.clamp.clds.util.XmlToolsTest;
+import org.w3c.dom.Document;
+import org.xml.sax.SAXException;
+
+@RunWith(MockitoJUnitRunner.class)
+public class ClampGraphTest {
+    @Mock
+    private DocumentBuilder mockDocumentBuilder;
+
+    @Test
+    public void getAsSVGTest() throws IOException, ParserConfigurationException, SAXException {
+        String expected = ResourceFileUtil.getResourceAsString("clds/util/file.xml");
+        Document document = XmlToolsTest.parseStringToXmlDocument(expected);
+
+        when(mockDocumentBuilder.getGroupingDocument()).thenReturn(document);
+
+        String actual = new ClampGraph(mockDocumentBuilder).getAsSVG();
+        Assert.assertEquals(expected.trim(), actual.trim());
+    }
+
+    @Test
+    public void getAsSVGLazyTest() throws IOException, ParserConfigurationException, SAXException {
+        String expected = ResourceFileUtil.getResourceAsString("clds/util/file.xml");
+        Document document = XmlToolsTest.parseStringToXmlDocument(expected);
+
+        when(mockDocumentBuilder.getGroupingDocument()).thenReturn(document);
+        ClampGraph cg = new ClampGraph(mockDocumentBuilder);
+
+        String actualFirst = cg.getAsSVG();
+        verify(mockDocumentBuilder, times(1)).getGroupingDocument();
+
+        String actualSecond = cg.getAsSVG();
+        verifyNoMoreInteractions(mockDocumentBuilder);
+
+        Assert.assertEquals(expected.trim(), actualFirst.trim());
+        Assert.assertEquals(expected.trim(), actualSecond.trim());
+
+    }
+}
\ No newline at end of file
diff --git a/src/test/java/org/onap/clamp/clds/util/drawing/DocumentBuilderTest.java b/src/test/java/org/onap/clamp/clds/util/drawing/DocumentBuilderTest.java
new file mode 100644
index 000000000..6546553c7
--- /dev/null
+++ b/src/test/java/org/onap/clamp/clds/util/drawing/DocumentBuilderTest.java
@@ -0,0 +1,80 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP CLAMP
+ * ================================================================================
+ * Copyright (C) 2019 Nokia. All rights
+ *                             reserved.
+ * ================================================================================
+ * Licensed 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.
+ * ============LICENSE_END============================================
+ * ===================================================================
+ *
+ */
+
+package org.onap.clamp.clds.util.drawing;
+
+import static org.mockito.Matchers.any;
+import static org.mockito.Mockito.when;
+
+import java.io.IOException;
+import javax.xml.parsers.ParserConfigurationException;
+import org.apache.batik.svggen.SVGGraphics2D;
+import org.apache.batik.util.SVGConstants;
+import org.junit.Assert;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.mockito.Mock;
+import org.mockito.runners.MockitoJUnitRunner;
+import org.onap.clamp.clds.util.ResourceFileUtil;
+import org.onap.clamp.clds.util.XmlToolsTest;
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.xml.sax.SAXException;
+
+@RunWith(MockitoJUnitRunner.class)
+public class DocumentBuilderTest {
+    @Mock
+    private SVGGraphics2D mockG2d;
+
+    @Mock
+    private Document mockDomImpl;
+
+    @Test
+    public void pushChangestoDocumentTest() throws IOException, ParserConfigurationException, SAXException {
+        String dataElementId = "someId";
+        String newNodeTag = "tagged";
+        String newNodeText = "Sample text";
+        String xml = ResourceFileUtil.getResourceAsString("clds/util/file.xml");
+        Document document = XmlToolsTest.parseStringToXmlDocument(xml);
+        Node newNode = document.createElement(newNodeTag);
+        newNode.appendChild(document.createTextNode(newNodeText));
+
+        when(mockG2d.getRoot(any(Element.class))).then(a -> a.getArgumentAt(0, Element.class).appendChild(newNode));
+
+        DocumentBuilder db = new DocumentBuilder(document, document);
+        db.pushChangestoDocument(mockG2d, dataElementId);
+        Document actualDocument = db.getGroupingDocument();
+
+        Node addedActualNode = actualDocument.getDocumentElement().getLastChild();
+        String actualDataElementId =
+            addedActualNode.getAttributes().getNamedItem(DocumentBuilder.DATA_ELEMENT_ID_ATTRIBUTE).getTextContent();
+
+        Assert.assertEquals(dataElementId, actualDataElementId);
+        Assert.assertEquals(SVGConstants.SVG_G_TAG, addedActualNode.getNodeName());
+
+        Node addedActualNodeChild = addedActualNode.getLastChild();
+        Assert.assertEquals(newNodeTag, addedActualNodeChild.getNodeName());
+        Assert.assertEquals(newNodeText, addedActualNodeChild.getTextContent());
+    }
+}
\ No newline at end of file
diff --git a/src/test/resources/clds/util/file.xml b/src/test/resources/clds/util/file.xml
new file mode 100644
index 000000000..81560bab4
--- /dev/null
+++ b/src/test/resources/clds/util/file.xml
@@ -0,0 +1,6 @@
+<note>
+  <to>Tove</to>
+  <from>Jani</from>
+  <heading>Reminder</heading>
+  <body>Message body</body>
+</note>