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+/*-
+ * ============LICENSE_START=======================================================
+ * Simulator
+ * ================================================================================
+ * 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.pnfsimulator.template.search.handler;
+
+import com.google.common.collect.Lists;
+import com.google.gson.JsonPrimitive;
+import org.springframework.data.mongodb.core.query.Criteria;
+
+import java.util.List;
+import java.util.regex.Pattern;
+
+/**
+ * This class is a helper class for constructing apropriate criteria for query send to mongodb based on type of value.
+ * Query is build to search mongodb for templates that contains key-value pairs that satisfy given criteria.
+ * Value is oftype JsonPrimitive, based on its primitive java type following criteria are build to get proper document:
+ * -for string - there is a regex expression that ignores every meta character inside passed argument and searches for exact literal match ignoring case;
+ * -for number - all numbers are treated as double (mongodb number type equivalent)
+ * -for boolean - exact match, used string representation of boolean in search
+ **/
+
+public class PrimitiveValueCriteriaBuilder {
+
+ private final List<ValueTypeHandler> typeHandlers;
+
+ public PrimitiveValueCriteriaBuilder() {
+ typeHandlers = Lists.newArrayList(new StringValueHandler(), new NumberValueHandler(), new BoolValueHandler());
+ }
+
+ public Criteria applyValueCriteriaBasedOnPrimitiveType(Criteria baseCriteria, JsonPrimitive jsonPrimitive) {
+ ValueTypeHandler typeHandler = typeHandlers.stream()
+ .filter(el -> el.isProperTypeHandler(jsonPrimitive))
+ .findFirst()
+ .orElseThrow(() ->
+ new IllegalArgumentException(String.format(
+ "Expected json primitive, but given value: %s is of type: %s and could not be decoded",
+ jsonPrimitive, jsonPrimitive.getClass().toString())));
+ return typeHandler.chainCriteriaForValue(baseCriteria, jsonPrimitive);
+ }
+
+ private interface ValueTypeHandler {
+ boolean isProperTypeHandler(JsonPrimitive value);
+
+ Criteria chainCriteriaForValue(Criteria criteria, JsonPrimitive value);
+ }
+
+ private class BoolValueHandler implements ValueTypeHandler {
+ public boolean isProperTypeHandler(JsonPrimitive value) {
+ return value.isBoolean();
+ }
+
+ public Criteria chainCriteriaForValue(Criteria criteria, JsonPrimitive value) {
+ return criteria.is(value.getAsString());
+ }
+
+ }
+
+ private class NumberValueHandler implements ValueTypeHandler {
+ public boolean isProperTypeHandler(JsonPrimitive value) {
+ return value.isNumber();
+ }
+
+ public Criteria chainCriteriaForValue(Criteria baseCriteria, JsonPrimitive value) {
+ return baseCriteria.is(value.getAsDouble());
+ }
+ }
+
+ private class StringValueHandler implements ValueTypeHandler {
+ public boolean isProperTypeHandler(JsonPrimitive value) {
+ return value.isString();
+ }
+
+ public Criteria chainCriteriaForValue(Criteria baseCriteria, JsonPrimitive value) {
+ return baseCriteria.regex(makeRegexCaseInsensitive(value.getAsString()));
+ }
+
+ private Pattern makeRegexCaseInsensitive(String base) {
+ String metaCharEscaped = convertToIgnoreMetaChars(base);
+ return Pattern.compile("^" + metaCharEscaped + "$", Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
+ }
+
+ private String convertToIgnoreMetaChars(String valueWithMetaChars) {
+ return Pattern.quote(valueWithMetaChars);
+ }
+ }
+}