--- /dev/null
+/*
+ * ============LICENSE_START====================================
+ * DCAEGEN2-SERVICES-SDK
+ * =========================================================
+ * 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.dcaegen2.services.sdk.rest.services.cbs.client.api.listener;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import com.google.gson.JsonObject;
+import io.vavr.collection.List;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Map.Entry;
+
+import static java.lang.String.valueOf;
+
+
+/**
+ * Class responsible for creating MerkleTree structure from JsonObject.
+ *
+ * @since 1.1.2
+ */
+class MerkleTreeParser {
+
+ /**
+ * <p> Method used to parse {@link JsonObject} into {@link MerkleTree} structure.</p>
+ * <p> The algorithm will recursively create mapping of (path in tree)->(value) from JsonObject
+ * and use it to create MerkleTree by means of {@link MerkleTree#add(List, Object)} method. </p>
+ * <p> Each JsonObject will append it's key to path until value of primitive type is encountered.
+ * For each JsonArray element artificial path is created by creating lables from sequential integers.
+ * This results in array split into multiple nodes in MerkleTree structure.</p>
+ *
+ * <p>Example. For JsonObject:
+ * <pre>
+ * {
+ * "p1": "v1",
+ * "p2": ["v2", "v3"]
+ * "p3": {
+ * "p4": "v4"
+ * }
+ * }
+ * </pre>
+ * following map would be created:</p>
+ * <pre>
+ * "v1" <- ["p1"]
+ * "v2" <- ["p2", "0"]
+ * "v3" <- ["p2", "1"]
+ * "v4" <- ["p3", "p4"]
+ * </pre>
+ *
+ * @param json JsonObject to be parsed
+ * @since 1.1.2
+ */
+ MerkleTree<String> fromJsonObject(final @NotNull JsonObject json) {
+ MerkleTree<String> tree = MerkleTree.emptyWithDefaultDigest(String::getBytes);
+ for (Entry<String, JsonElement> entry : json.entrySet()) {
+ tree = treeEnhancedWithEntry(tree, entry);
+ }
+
+ return tree;
+ }
+
+ private MerkleTree<String> treeEnhancedWithEntry(final MerkleTree<String> tree,
+ final Entry<String, JsonElement> entry) {
+ return createTreeFromValuesPaths(tree, pathsToValues(entry, List.empty()));
+ }
+
+ private Map<List<String>, String> pathsToValues(Entry<String, JsonElement> entry, List<String> elementPathPrefix) {
+ return pathsToValuesFromJsonElement(entry.getKey(), entry.getValue(), elementPathPrefix);
+ }
+
+ private Map<List<String>, String> pathsToValuesFromJsonElement(final String jsonKey,
+ final JsonElement element,
+ final List<String> elementPathPrefix) {
+ final HashMap<List<String>, String> pathToValue = new HashMap<>();
+ final List<String> newPrefix = elementPathPrefix.append(jsonKey);
+
+ if (element.isJsonObject()) {
+ element.getAsJsonObject()
+ .entrySet()
+ .forEach(entry -> pathToValue.putAll(pathsToValues(entry, newPrefix)));
+ } else if (element.isJsonArray()) {
+ pathToValue.putAll(handleArray(newPrefix, element.getAsJsonArray()));
+ } else if (element.isJsonPrimitive()) {
+ pathToValue.put(newPrefix, element.getAsString());
+ } else if (element.isJsonNull()) {
+ pathToValue.put(newPrefix, null);
+ }
+ return pathToValue;
+ }
+
+ private HashMap<List<String>, String> handleArray(List<String> newPrefix, JsonArray jsonArray) {
+ final HashMap<List<String>, String> hashMap = new HashMap<>();
+ int labelIndex = 0;
+
+ for (JsonElement jsonElement : jsonArray) {
+ String jsonKey = valueOf(labelIndex++);
+ hashMap.putAll(pathsToValuesFromJsonElement(jsonKey, jsonElement, newPrefix));
+ }
+ return hashMap;
+ }
+
+ private MerkleTree<String> createTreeFromValuesPaths(MerkleTree<String> tree,
+ final Map<List<String>, String> pathToValue) {
+ for (Entry<List<String>, String> entry : pathToValue.entrySet()) {
+ List<String> path = entry.getKey();
+ String value = entry.getValue();
+ tree = tree.add(path, value);
+ }
+ return tree;
+ }
+}
--- /dev/null
+/*
+ * ============LICENSE_START====================================
+ * DCAEGEN2-SERVICES-SDK
+ * =========================================================
+ * 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.dcaegen2.services.sdk.rest.services.cbs.client.api.listener;
+
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
+import org.jetbrains.annotations.NotNull;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigInteger;
+
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+class MerkleTreeParserTest {
+
+ private final MerkleTreeParser cut = new MerkleTreeParser();
+
+ @Test
+ void fromJsonObject_givenEmptyJsonObject_shouldReturnEmptyMerkleTree() {
+ JsonObject jsonObject = new JsonObject();
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ assertThat(tree.isSame(emptyTree())).isTrue();
+ }
+
+ @Test
+ void fromJsonObject_givenSingleKeyValuePair_shouldReturnSingleNodeTree() {
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.addProperty("p1", "v1");
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("v1", "p1");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+ @Test
+ void fromJsonObject_givenSingleKeyValuePair_atDeeperPathLevel_shouldReturnTreeWithSingleLeafAndCorrectNodesOnTheWay() {
+ JsonObject singleKeyValuePair = new JsonObject();
+ singleKeyValuePair.addProperty("p3", "v1");
+ JsonObject intermediateNode = new JsonObject();
+ intermediateNode.add("p2", singleKeyValuePair);
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.add("p1", intermediateNode);
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("v1", "p1", "p2", "p3");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+ @Test
+ void fromJsonObject_givenMultipleKeyValuePairs_shouldCreateMultipleLeafs() {
+ JsonObject keyValuePairs = new JsonObject();
+ keyValuePairs.addProperty("A", "vA");
+ keyValuePairs.addProperty("B", "vB");
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.add("p1", keyValuePairs);
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("vA", "p1", "A")
+ .add("vB", "p1", "B");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+ @Test
+ void fromJsonObject_givenJsonArray_shouldCreateMultipleLeafsUnderArtificialNodes() {
+ JsonObject singleKeyValuePair = new JsonObject();
+ singleKeyValuePair.addProperty("p2", "v2");
+ JsonArray jsonArray = new JsonArray();
+ jsonArray.add("v1");
+ jsonArray.add(singleKeyValuePair);
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.add("p1", jsonArray);
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("v1", "p1", "0")
+ .add("v2", "p1", "1", "p2");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+
+ @Test
+ void fromJsonObject_givenMoreComplicatedJson_shouldReturnCorrectTree() {
+ // below example is contained in javadoc for method
+ JsonObject jsonObject2 = new JsonObject();
+ jsonObject2.addProperty("p4", "v4");
+ JsonArray jsonArray = new JsonArray();
+ jsonArray.add("v2");
+ jsonArray.add("v3");
+
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.addProperty("p1", "v1");
+ jsonObject.add("p2", jsonArray);
+ jsonObject.add("p3", jsonObject2);
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("v1", "p1")
+ .add("v2", "p2", "0")
+ .add("v3", "p2", "1")
+ .add("v4", "p3", "p4");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+ @Test
+ void fromJsonObject_givenNotStringValues_shouldCastAllToString() {
+ JsonArray jsonArray = new JsonArray();
+ jsonArray.add(1);
+ jsonArray.add(2L);
+ jsonArray.add(3.0);
+ jsonArray.add(true);
+ jsonArray.add(new BigInteger("999799799799799"));
+ JsonObject jsonObject = new JsonObject();
+ jsonObject.add("p1", jsonArray);
+
+ MerkleTree<String> tree = cut.fromJsonObject(jsonObject);
+
+ MerkleTree<String> expected = emptyTree()
+ .add("1", "p1", "0")
+ .add("2", "p1", "1")
+ .add("3.0", "p1", "2")
+ .add("true", "p1", "3")
+ .add("999799799799799", "p1", "4");
+ assertThat(tree).isEqualTo(expected);
+ }
+
+ @NotNull
+ private MerkleTree<String> emptyTree() {
+ return MerkleTree.emptyWithDefaultDigest(String::getBytes);
+ }
+}
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Code Review / dcaegen2 / services / sdk.git / commitdiff