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/**
* ============LICENSE_START=======================================================
* org.onap.aai
* ================================================================================
* Copyright © 2019 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.onap.aai.nodes;
import com.google.common.base.CaseFormat;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
/**
* CaseFormatStore stores the converted strings from
* lower hyphen (example-object) to lower camel case (exampleObject)
* so it avoids the creation of the object for every single request
* and cause an issue with taking too much memory just for the conversion
*/
public class CaseFormatStore {
private final Map<String, String> lowerHyphenToLowerCamel = new HashMap<>();
private final Map<String, String> lowerHyphenToUpperCamel = new HashMap<>();
private final Map<String, String> lowerCamelToLowerHyphen = new HashMap<>();
private final Map<String, String> upperCamelToLowerHyphen = new HashMap<>();
CaseFormatStore() {
}
/**
* Parses the document and creates a lower camel case string
* upper camel string, lower hyphen and lower camel case
*
* @param doc Takes an xml document and adds it to the hash maps as appropriate
*/
void parse(Document doc) {
// Get the xml-root-element and add those nodes
// with the attribute name and it to the hashmaps
// For the attribute with name, it is going to be lower-hyphen
// If the attribute is javaAttribute then it will be lower camel case
NodeList list = doc.getElementsByTagName("xml-root-element");
addCaseFormatForNodesAndProperties(list, "name");
list = doc.getElementsByTagName("xml-element");
addCaseFormatForNodesAndProperties(list, "java-attribute");
list = doc.getElementsByTagName("xml-any-element");
addCaseFormatForNodesAndProperties(list, "java-attribute");
}
private void addCaseFormatForNodesAndProperties(NodeList list, String attributeName) {
for (int i = 0; i < list.getLength(); i++) {
String lowerCamel = null;
String lowerHyphen = null;
if ("java-attribute".equals(attributeName)) {
lowerCamel = list.item(i).getAttributes().getNamedItem(attributeName).getNodeValue();
lowerHyphen = CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_HYPHEN, lowerCamel);
} else {
lowerHyphen = list.item(i).getAttributes().getNamedItem(attributeName).getNodeValue();
lowerCamel = CaseFormat.LOWER_HYPHEN.to(CaseFormat.LOWER_CAMEL, lowerHyphen);
}
String upperCamel = CaseFormat.LOWER_HYPHEN.to(CaseFormat.UPPER_CAMEL, lowerHyphen);
lowerHyphenToLowerCamel.put(lowerHyphen, lowerCamel);
lowerHyphenToUpperCamel.put(lowerHyphen, upperCamel);
upperCamelToLowerHyphen.put(upperCamel, lowerHyphen);
lowerCamelToLowerHyphen.put(lowerCamel, lowerHyphen);
}
}
public Optional<String> fromLowerHyphenToLowerCamel(String value) {
return Optional.ofNullable(lowerHyphenToLowerCamel.get(value));
}
public Optional<String> fromLowerHyphenToUpperCamel(String value) {
return Optional.ofNullable(lowerHyphenToUpperCamel.get(value));
}
public Optional<String> fromUpperCamelToLowerHyphen(String value) {
return Optional.ofNullable(upperCamelToLowerHyphen.get(value));
}
public Optional<String> fromLowerCamelToLowerHyphen(String value) {
return Optional.ofNullable(lowerCamelToLowerHyphen.get(value));
}
}
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