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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);
}
}
}
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