1 files changed, 187 insertions, 0 deletions
diff --git a/openecomp-be/lib/openecomp-core-lib/openecomp-utilities-lib/src/main/java/org/openecomp/core/utilities/json/JsonUtil.java b/openecomp-be/lib/openecomp-core-lib/openecomp-utilities-lib/src/main/java/org/openecomp/core/utilities/json/JsonUtil.java
new file mode 100644
index 0000000000..6ae3677a8d
--- /dev/null
+++ b/openecomp-be/lib/openecomp-core-lib/openecomp-utilities-lib/src/main/java/org/openecomp/core/utilities/json/JsonUtil.java
@@ -0,0 +1,187 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * SDC
+ * ================================================================================
+ * Copyright (C) 2017 AT&T Intellectual Property. 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.openecomp.core.utilities.json;
+
+
+import com.google.gson.Gson;
+import com.google.gson.GsonBuilder;
+import com.google.gson.JsonIOException;
+import com.google.gson.JsonParser;
+import com.google.gson.JsonSyntaxException;
+
+import org.apache.commons.collections.CollectionUtils;
+import org.everit.json.schema.EnumSchema;
+import org.everit.json.schema.Schema;
+import org.everit.json.schema.ValidationException;
+import org.everit.json.schema.loader.SchemaLoader;
+import org.json.JSONObject;
+import org.openecomp.core.utilities.CommonMethods;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.io.StringReader;
+import java.util.Collections;
+import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
+
+/**
+ * The type Json util.
+ */
+public class JsonUtil {
+
+  /**
+   * Object 2 json string.
+   *
+   * @param obj the obj
+   * @return the string
+   */
+  //TODO: refactor all other ugly code to use this
+  public static String object2Json(Object obj) {
+    return sbObject2Json(obj).toString();
+
+  }
+
+  /**
+   * Sb object 2 json string buffer.
+   *
+   * @param obj the obj
+   * @return the string buffer
+   */
+  public static StringBuffer sbObject2Json(Object obj) {
+    return new StringBuffer((new GsonBuilder()).setPrettyPrinting().create().toJson(obj));
+  }
+
+  /**
+   * Json 2 object t.
+   *
+   * @param <T>      the type parameter
+   * @param json     the json
+   * @param classOfT the class of t
+   * @return the t
+   */
+  public static <T> T json2Object(String json, Class<T> classOfT) {
+    T type;
+    try {
+      try (Reader br = new StringReader(json)) {
+        type = new Gson().fromJson(br, classOfT);
+      } catch (IOException e0) {
+        throw e0;
+      }
+    } catch (JsonIOException | JsonSyntaxException | IOException e0) {
+      throw new RuntimeException(e0);
+    }
+    return type;
+  }
+
+  /**
+   * Json 2 object t.
+   *
+   * @param <T>      the type parameter
+   * @param is       the is
+   * @param classOfT the class of t
+   * @return the t
+   */
+  public static <T> T json2Object(InputStream is, Class<T> classOfT) {
+    T type;
+    try {
+      try (Reader br = new BufferedReader(new InputStreamReader(is))) {
+        type = new Gson().fromJson(br, classOfT);
+      }
+    } catch (JsonIOException | JsonSyntaxException | IOException e0) {
+      throw new RuntimeException(e0);
+    } finally {
+      if (is != null) {
+        try {
+          is.close();
+        } catch (IOException ignore) {
+          //do nothing
+        }
+      }
+    }
+    return type;
+  }
+
+
+  /**
+   * Is valid json boolean.
+   *
+   * @param json the json
+   * @return the boolean
+   */
+  //todo check https://github.com/stleary/JSON-java as replacement for this code
+  public static boolean isValidJson(String json) {
+    try {
+      return new JsonParser().parse(json).isJsonObject();
+    } catch (JsonSyntaxException jse) {
+      return false;
+    }
+  }
+
+  /**
+   * Validate list.
+   *
+   * @param json       the json
+   * @param jsonSchema the json schema
+   * @return the list
+   */
+  public static List<String> validate(String json, String jsonSchema) {
+    List<ValidationException> validationErrors = validateUsingEverit(json, jsonSchema);
+    return validationErrors == null ? null
+        : validationErrors.stream().map(JsonUtil::mapValidationExceptionToMessage)
+            .collect(Collectors.toList());
+  }
+
+  private static String mapValidationExceptionToMessage(ValidationException e0) {
+    if (e0.getViolatedSchema() instanceof EnumSchema) {
+      return mapEnumViolationToMessage(e0);
+    }
+    return e0.getMessage();
+  }
+
+  private static String mapEnumViolationToMessage(ValidationException e1) {
+    Set<Object> possibleValues = ((EnumSchema) e1.getViolatedSchema()).getPossibleValues();
+    return e1.getMessage().replaceFirst("enum value", possibleValues.size() == 1
+        ? String.format("value. %s is the only possible value for this field",
+            possibleValues.iterator().next())
+        : String.format("value. Possible values: %s", CommonMethods
+            .collectionToCommaSeparatedString(
+                possibleValues.stream().map(Object::toString).collect(Collectors.toList()))));
+  }
+
+  private static List<ValidationException> validateUsingEverit(String json, String jsonSchema) {
+    if (json == null || jsonSchema == null) {
+      throw new IllegalArgumentException("Input strings json and jsonSchema can not be null");
+    }
+
+    Schema schemaObj = SchemaLoader.load(new JSONObject(jsonSchema));
+    try {
+      schemaObj.validate(new JSONObject(json));
+    } catch (ValidationException ve) {
+      return CollectionUtils.isEmpty(ve.getCausingExceptions()) ? Collections.singletonList(ve)
+          : ve.getCausingExceptions();
+    }
+    return null;
+  }
+}