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server: Only serialize supported value types in OutputElementStyle
This will make sure that only objects that comply with the TSP specification are serialized. Added unit tests to verify this. eclipse-cdt-cloud/trace-server-protocol#102 Signed-off-by: Bernd Hufmann <[email protected]>
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‎trace-server/org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core.tests/src/org/eclipse/tracecompass/incubator/trace/server/jersey/rest/core/tests/webapp/AbstractSerializerTest.java‎

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/*******************************************************************************
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* Copyright (c) 2025 Ericsson and others
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*
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* All rights reserved. This program and the accompanying materials are
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* made available under the terms of the Eclipse Public License 2.0 which
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* accompanies this distribution, and is available at
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* https://www.eclipse.org/legal/epl-2.0/
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*
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* SPDX-License-Identifier: EPL-2.0
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*******************************************************************************/
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package org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core.tests.webapp;
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import org.junit.Before;
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import com.fasterxml.jackson.databind.ObjectMapper;
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/**
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* Abstract test class for testing serializers
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*
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* @author Bernd Hufmann
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*/
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public class AbstractSerializerTest {
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/**
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* A object mapper to be used for serialization / deserialization. A new
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* instance is created per test case.
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*/
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protected ObjectMapper fMapper;
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/**
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* Test setup
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*/
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@Before
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public void setup() {
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fMapper = new ObjectMapper();
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}
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}

‎trace-server/org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core.tests/src/org/eclipse/tracecompass/incubator/trace/server/jersey/rest/core/tests/webapp/OutputElementStyleSerializerTest.java‎

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/*******************************************************************************
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* Copyright (c) 2025 Ericsson and others
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*
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* All rights reserved. This program and the accompanying materials are
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* made available under the terms of the Eclipse Public License 2.0 which
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* accompanies this distribution, and is available at
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* https://www.eclipse.org/legal/epl-2.0/
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*
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* SPDX-License-Identifier: EPL-2.0
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*******************************************************************************/
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package org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core.tests.webapp;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertNotNull;
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import static org.junit.Assert.assertTrue;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Map.Entry;
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import org.eclipse.tracecompass.incubator.internal.trace.server.jersey.rest.core.webapp.OutputElementStyleSerializer;
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import org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core.tests.stubs.OutputElementStyleStub;
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import org.eclipse.tracecompass.tmf.core.model.OutputElementStyle;
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import org.eclipse.tracecompass.tmf.core.model.StyleProperties;
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import org.junit.Test;
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import com.fasterxml.jackson.core.JsonProcessingException;
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import com.fasterxml.jackson.databind.module.SimpleModule;
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/**
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* Test the {@link OutputElementStyleSerializer}
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*
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* @author Bernd Hufmann
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*/
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public class OutputElementStyleSerializerTest extends AbstractSerializerTest {
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private static final String VALID_STYLE_NAME = "valid-styles";
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private static final String MAPPED_STYLE_NAME = "mapped-styles";
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private static final String INVALID_STYLE_NAME = "invalid-styles";
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/**
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* Verify that valid style objects are serialized properly
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*
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* @throws JsonProcessingException
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* if an error occurs
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*/
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@SuppressWarnings("null")
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@Test
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public void testValidStyles() throws JsonProcessingException {
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Map<String, Object> validStyles = new HashMap<>();
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validStyles.put(StyleProperties.BACKGROUND_COLOR, "ffffff");
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validStyles.put(StyleProperties.LINEAR_GRADIENT, "true");
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validStyles.put(StyleProperties.OPACITY, 0.4f);
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validStyles.put(StyleProperties.WIDTH, Integer.valueOf(4));
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SimpleModule module = new SimpleModule();
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module.addSerializer(OutputElementStyle.class, new OutputElementStyleSerializer());
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fMapper.registerModule(module);
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OutputElementStyle testStyle = new OutputElementStyle(VALID_STYLE_NAME, validStyles);
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String json = fMapper.writeValueAsString(testStyle);
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OutputElementStyleStub deserialized = fMapper.readValue(json, OutputElementStyleStub.class);
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assertEquals(testStyle.getParentKey(), deserialized.getParentKey());
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verifyStyles(testStyle, deserialized);
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}
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/**
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* Verify that certain types of style objects are serialized properly, e.g. Long
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* are casted to Integer
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*
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* @throws JsonProcessingException
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* if an error occurs
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*/
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@SuppressWarnings("null")
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@Test
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public void testMappedStyles() throws JsonProcessingException {
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Map<String, Object> mappedStyles = new HashMap<>();
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mappedStyles.put(StyleProperties.LINEAR_GRADIENT, "true");
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mappedStyles.put(StyleProperties.OPACITY, 0.4d);
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mappedStyles.put("long-style", Long.valueOf(1234));
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mappedStyles.put("byte-style", Byte.valueOf((byte) 5));
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SimpleModule module = new SimpleModule();
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module.addSerializer(OutputElementStyle.class, new OutputElementStyleSerializer());
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fMapper.registerModule(module);
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OutputElementStyle testStyle = new OutputElementStyle(MAPPED_STYLE_NAME, mappedStyles);
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String json = fMapper.writeValueAsString(testStyle);
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OutputElementStyleStub deserialized = fMapper.readValue(json, OutputElementStyleStub.class);
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assertEquals(testStyle.getParentKey(), deserialized.getParentKey());
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verifyStyles(testStyle, deserialized);
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}
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/**
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* Verify that types of style objects that are not specified in the TSP are not serialized properly
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*
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* @throws JsonProcessingException
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* if an error occurs
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*/
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@SuppressWarnings("null")
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@Test
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public void testInvalidStyles() throws JsonProcessingException {
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Map<String, Object> invalidStyles = new HashMap<>();
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invalidStyles.put("ignore-invalid", invalidStyles);
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invalidStyles.put("ingore-long-style1", Long.valueOf(Long.MIN_VALUE));
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invalidStyles.put("ingore-long-style2", Long.valueOf(Long.MAX_VALUE));
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SimpleModule module = new SimpleModule();
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module.addSerializer(OutputElementStyle.class, new OutputElementStyleSerializer());
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fMapper.registerModule(module);
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OutputElementStyle testStyle = new OutputElementStyle(INVALID_STYLE_NAME, invalidStyles);
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String json = fMapper.writeValueAsString(testStyle);
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OutputElementStyleStub deserialized = fMapper.readValue(json, OutputElementStyleStub.class);
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assertEquals(testStyle.getParentKey(), deserialized.getParentKey());
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assertTrue(deserialized.getStyleValues().isEmpty());
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}
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private static void verifyStyles(OutputElementStyle testStyle, OutputElementStyleStub deserialized) {
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for (Entry<String, Object> entry : testStyle.getStyleValues().entrySet()) {
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Map<String, Object> styleValues = deserialized.getStyleValues();
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assertNotNull(styleValues);
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String key = entry.getKey();
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Object entryValue = entry.getValue();
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assertTrue(key, styleValues.containsKey(key));
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if (entryValue instanceof Float || entryValue instanceof Double) {
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assertEquals(key, Double.valueOf(entryValue.toString()), styleValues.get(key));
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} else if (entryValue instanceof Number longValue) {
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assertEquals(key, longValue.intValue(), styleValues.get(key));
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} else {
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assertEquals(key, entryValue, styleValues.get(key));
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}
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}
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}
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}

‎trace-server/org.eclipse.tracecompass.incubator.trace.server.jersey.rest.core/src/org/eclipse/tracecompass/incubator/internal/trace/server/jersey/rest/core/webapp/OutputElementStyleSerializer.java‎

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package org.eclipse.tracecompass.incubator.internal.trace.server.jersey.rest.core.webapp;
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import java.io.IOException;
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import java.util.Map.Entry;
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import org.eclipse.jdt.annotation.NonNull;
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import org.eclipse.tracecompass.tmf.core.model.OutputElementStyle;
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super(OutputElementStyle.class);
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}
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/**
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* Serialize {@link OutputElementStyle} according to TSP, see here for details:
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* {@link org.eclipse.tracecompass.incubator.internal.trace.server.jersey.rest.core.model.OutputElementStyle}
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*/
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@SuppressWarnings({ "nls", "null" })
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@Override
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public void serialize(@NonNull OutputElementStyle value, JsonGenerator gen, SerializerProvider serializers) throws IOException {
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gen.writeStartObject();
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gen.writeStringField("parentKey", value.getParentKey()); //$NON-NLS-1$
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gen.writeObjectField("values", value.getStyleValues()); //$NON-NLS-1$
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gen.writeStringField("parentKey", value.getParentKey());
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// Verify the type of style values. Make sure only supported types are returned.
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gen.writeObjectFieldStart("values");
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for (Entry<String, Object> entry : value.getStyleValues().entrySet()) {
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Object entryValue = entry.getValue();
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if (entryValue instanceof Long longValue) {
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if (longValue >= Integer.MIN_VALUE && longValue <= Integer.MAX_VALUE) {
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gen.writeFieldName(entry.getKey());
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gen.writeNumber(longValue.intValue());
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}
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} else if ((entryValue instanceof String) || (entryValue instanceof Number)) {
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gen.writeFieldName(entry.getKey());
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gen.writeObject(entryValue);
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}
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}
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gen.writeEndObject();
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gen.writeEndObject();
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}
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