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/*
* ============LICENSE_START=======================================================
* ONAP : DCAE
* ================================================================================
* Copyright 2018 TechMahindra
*=================================================================================
* 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.universalvesadapter.utils;
import com.att.aft.dme2.internal.apache.commons.lang3.EnumUtils;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.util.Set;
import java.util.TreeSet;
import org.onap.universalvesadapter.exception.MapperConfigException;
import org.onap.universalvesadapter.mappingconfig.Entry;
import org.onap.universalvesadapter.mappingconfig.Evaluation;
import org.onap.universalvesadapter.mappingconfig.MapperConfig;
/**
* This class will be utility class to read the mapper config file and parse the
* config to prepare the grammar to detect the incoming json's event type.
*
* @author kmalbari
*
*/
public class MapperConfigUtils {
private static Set<Entry> entries = new TreeSet<>((o1, o2) -> o1.getPriority().compareTo(o2.getPriority()));
private enum JoinOperator {
AND("AND"), OR("OR");
private final String value;
private JoinOperator(final String value) {
this.value = value;
}
public String getValue() {
return value;
}
}
private enum ExpressionOperator {
EQUALS("EQUALS"), STARTSWITH("STARTSWITH"), ENDSWITH("ENDSWITH"), CONTAINS("CONTAINS");
private final String value;
private ExpressionOperator(final String value) {
this.value = value;
}
public String getValue() {
return value;
}
}
private enum DataType {
STRING("STRING"), DOUBLE("DOUBLE");
private final String value;
private DataType(final String value) {
this.value = value;
}
public String getValue() {
return value;
}
}
/**
* main method.
*
* @param args
* arguments
*/
public static void main(String[] args) {
String mappingFile = " { " + " \"entries\": [{ " + " \"priority\": 4, " + " \"evaluation\": { "
+ " \"operand\": \"AND\", " + " \"field\": null, " + " \"value\": null, "
+ " \"datatype\": null, " + " \"lhs\": { " + " \"operand\": \"OR\", "
+ " \"field\": null, " + " \"value\": null, "
+ " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"domain\", "
+ " \"value\": \"snmp-heartbeat\", " + " \"datatype\": \"string\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " }, "
+ " \"rhs\": { " + " \"operand\": \"EQUALS\", "
+ " \"field\": \"domain\", " + " \"value\": \"snmp-fault\", "
+ " \"datatype\": \"string\", " + " \"lhs\": null, "
+ " \"rhs\": null " + " } " + " }, " + " \"rhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"trap version\", "
+ " \"value\": \"1.2\", " + " \"datatype\": \"float\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " } " + " }, "
+ " \"result\": \"smooks.config\" " + " }, { " + " \"priority\": 1, "
+ " \"evaluation\": { " + " \"operand\": \"AND\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"OR\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"domain\", "
+ " \"value\": \"snmp-heartbeat\", " + " \"datatype\": \"string\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " }, "
+ " \"rhs\": { " + " \"operand\": \"EQUALS\", "
+ " \"field\": \"domain\", " + " \"value\": \"snmp-fault\", "
+ " \"datatype\": \"string\", " + " \"lhs\": null, "
+ " \"rhs\": null " + " } " + " }, " + " \"rhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"trap version\", "
+ " \"value\": \"1.2\", " + " \"datatype\": \"float\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " } " + " }, "
+ " \"result\": \"smooks.config\" " + " }, { " + " \"priority\": 3, "
+ " \"evaluation\": { " + " \"operand\": \"AND\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"OR\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"domain\", "
+ " \"value\": \"snmp-heartbeat\", " + " \"datatype\": \"string\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " }, "
+ " \"rhs\": { " + " \"operand\": \"EQUALS\", "
+ " \"field\": \"domain\", " + " \"value\": \"snmp-fault\", "
+ " \"datatype\": \"string\", " + " \"lhs\": null, "
+ " \"rhs\": null " + " } " + " }, " + " \"rhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"trap version\", "
+ " \"value\": \"1.2\", " + " \"datatype\": \"float\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " } " + " }, "
+ " \"result\": \"smooks.config\" " + " }, { " + " \"priority\": 2, "
+ " \"evaluation\": { " + " \"operand\": \"AND\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"OR\", " + " \"field\": null, "
+ " \"value\": null, " + " \"datatype\": null, " + " \"lhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"domain\", "
+ " \"value\": \"snmp-heartbeat\", " + " \"datatype\": \"string\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " }, "
+ " \"rhs\": { " + " \"operand\": \"EQUALS\", "
+ " \"field\": \"domain\", " + " \"value\": \"snmp-fault\", "
+ " \"datatype\": \"string\", " + " \"lhs\": null, "
+ " \"rhs\": null " + " } " + " }, " + " \"rhs\": { "
+ " \"operand\": \"EQUALS\", " + " \"field\": \"trap version\", "
+ " \"value\": \"1.2\", " + " \"datatype\": \"float\", "
+ " \"lhs\": null, " + " \"rhs\": null " + " } " + " }, "
+ " \"result\": \"smooks.config\" " + " }] " + "}";
String incomingJsonString = "{\"domain\":\"snmp-heartbeat\",\"trap version\":1.2}";
try {
readMapperConfigFile(mappingFile);
checkIncomingJsonForMatchingDomain(incomingJsonString);
} catch (MapperConfigException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
/**
* Checks incoming json to see which of the domain it mathces as per mapper
* config entries. If nothing matches, a default mapping will be used.
*
* @param incomingJsonString
* incoming json
* @throws MapperConfigException
* if error occurs in operation
*/
public static String checkIncomingJsonForMatchingDomain(String incomingJsonString) throws MapperConfigException {
ObjectMapper mapper = new ObjectMapper();
JsonNode actualObj = null;
try {
actualObj = mapper.readTree(incomingJsonString);
} catch (IOException exception) {
throw new MapperConfigException("Unable to read incoming json in a tree " + exception.getMessage(),
exception);
}
for (Entry entry : entries) {
boolean result = false;
result = evaluateEntryMatch(entry.getEvaluation(), actualObj);
if (result) {
return entry.getResult();
}
}
return "default";
}
/**
* Reads the mapper config file.
*
* @param mappingFileData
* string json for mapper config
* @throws MapperConfigException
* if error in mapper config
*/
public static void readMapperConfigFile(String mappingFileData) throws MapperConfigException {
ObjectMapper name = new ObjectMapper();
MapperConfig config = null;
try {
config = name.readValue(mappingFileData, MapperConfig.class);
} catch (IOException exception) {
throw new MapperConfigException("Unable to read config file for reason...\n " + exception.getMessage(),
exception);
}
System.out.println("Read config file content into :" + config);
if (null != config) {
entries.addAll(config.getEntries());
} else {
throw new MapperConfigException("Unable to generate configuration for different domains.");
}
}
/**
* Evaluates the passed in {@code Evaluation} instance and return boolean
* result.
*
* @param evaluation
* evaluation instance
* @param actualObj
* Json node with values to compare with
* @return true if matches evaluation else false
* @throws MapperConfigException
* error in evaluation
*/
public static boolean evaluateEntryMatch(Evaluation evaluation, JsonNode actualObj) throws MapperConfigException {
if (null == evaluation) {
throw new MapperConfigException("Cannot have null evaluation");
}
if (null != evaluation.getOperand()) {
if (EnumUtils.isValidEnum(JoinOperator.class, evaluation.getOperand())) {
// if(JOIN_OPERATOR.contains(evaluation.getOperand())){
switch (JoinOperator.valueOf(evaluation.getOperand())) {
case AND:
return evaluateEntryMatch(evaluation.getLhs(), actualObj)
&& evaluateEntryMatch(evaluation.getRhs(), actualObj);
case OR:
return evaluateEntryMatch(evaluation.getLhs(), actualObj)
|| evaluateEntryMatch(evaluation.getRhs(), actualObj);
default:
break;
}
}
if (EnumUtils.isValidEnum(ExpressionOperator.class, evaluation.getOperand())) {
// if(EXPR_OPERATOR.contains(evaluation.getOperand())){
// currently it is assumed field being compared is first level
// child of incoming JSON structure.
// If needed, can write a JsonPath implementation later
String field = evaluation.getField();
if (null != field && null != evaluation.getDatatype() && actualObj.has(field)) {
switch (ExpressionOperator.valueOf(evaluation.getOperand())) {
case EQUALS:
if (EnumUtils.isValidEnum(DataType.class, evaluation.getDatatype())) {
switch (DataType.valueOf(evaluation.getDatatype())) {
case STRING:
if (null != actualObj.get(field))
return actualObj.get(field).asText().equals(evaluation.getValue());
case DOUBLE:
if (null != actualObj.get(field))
return actualObj.get(field).asDouble() == Double
.valueOf(evaluation.getValue());
default:
return false;
}
} else
return false;
case STARTSWITH:
if (EnumUtils.isValidEnum(DataType.class, evaluation.getDatatype())) {
switch (DataType.valueOf(evaluation.getDatatype())) {
case STRING:
if (null != actualObj.get(field))
return actualObj.get(field).asText().startsWith(evaluation.getValue());
default:
return false;
}
} else
return false;
case ENDSWITH:
if (EnumUtils.isValidEnum(DataType.class, evaluation.getDatatype())) {
switch (DataType.valueOf(evaluation.getDatatype())) {
case STRING:
if (null != actualObj.get(field))
return actualObj.get(field).asText().endsWith(evaluation.getValue());
default:
return false;
}
} else
return false;
case CONTAINS:
if (EnumUtils.isValidEnum(DataType.class, evaluation.getDatatype())) {
switch (DataType.valueOf(evaluation.getDatatype())) {
case STRING:
if (null != actualObj.get(field))
return actualObj.get(field).asText().contains(evaluation.getValue());
default:
return false;
}
} else
return false;
default:
return false;
}
}
}
} else
throw new MapperConfigException("Not an expected operand as per config for " + evaluation.getField());
return false;
}
}
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