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/*-
* ============LICENSE_START=======================================================
* org.onap.dcaegen2.collectors.restconf
* ================================================================================
* Copyright (C) 2018-2019 Huawei. 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.dcae.common;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import static com.google.common.base.Preconditions.checkNotNull;
public class XmlParser {
private static final Logger log = LoggerFactory.getLogger(XmlParser.class);
private XmlParser() {
// Preventing instantiation of the same.
}
public static Map<String, String> convertToProperties(String s, Set<String> listNameList)
throws Exception {
checkNotNull(s, "Input should not be null.");
Handler handler = new Handler(listNameList);
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
InputStream in = new ByteArrayInputStream(s.getBytes());
saxParser.parse(in, handler);
} catch (ParserConfigurationException | IOException | SAXException | NumberFormatException e) {
throw new IOException("Unable to convert XML to properties" + e.getLocalizedMessage(), e);
}
return handler.getProperties();
}
private static class Handler extends DefaultHandler {
private Set<String> listNameList;
private Map<String, String> properties = new HashMap<>();
public Map<String, String> getProperties() {
return properties;
}
public Handler(Set<String> listNameList) {
super();
this.listNameList = listNameList;
if (this.listNameList == null) {
this.listNameList = new HashSet<>();
}
}
StringBuilder currentName = new StringBuilder();
StringBuilder currentValue = new StringBuilder();
@Override
public void startElement(String uri, String localName, String qName, Attributes attributes)
throws SAXException {
super.startElement(uri, localName, qName, attributes);
String name = localName;
if (name == null || name.trim().length() == 0) {
name = qName;
}
int i2 = name.indexOf(':');
if (i2 >= 0) {
name = name.substring(i2 + 1);
}
if (currentName.length() > 0) {
currentName.append(Character.toString('.'));
}
currentName.append(name);
String listName = removeIndexes(currentName.toString());
if (listNameList.contains(listName)) {
String n = currentName.toString() + "_length";
int len = getInt(properties, n);
properties.put(n, String.valueOf(len + 1));
currentName.append("[").append(len).append("]");
}
}
@Override
public void endElement(String uri, String localName, String qName) throws SAXException {
super.endElement(uri, localName, qName);
String name = localName;
if (name == null || name.trim().length() == 0) {
name = qName;
}
int i2 = name.indexOf(':');
if (i2 >= 0) {
name = name.substring(i2 + 1);
}
String s = currentValue.toString().trim();
if (s.length() > 0) {
properties.put(currentName.toString(), s);
log.info("Added property: {} : {}", currentName, s);
currentValue = new StringBuilder();
}
int i1 = currentName.lastIndexOf("." + name);
if (i1 <= 0) {
currentName = new StringBuilder();
} else {
currentName = new StringBuilder(currentName.substring(0, i1));
}
}
@Override
public void characters(char[] ch, int start, int length) throws SAXException {
super.characters(ch, start, length);
String value = new String(ch, start, length);
currentValue.append(value);
}
private static int getInt(Map<String, String> mm, String name) {
String s = mm.get(name);
if (s == null) {
return 0;
}
return Integer.parseInt(s);
}
private String removeIndexes(String currentName) {
StringBuilder b = new StringBuilder();
boolean add = true;
for (int i = 0; i < currentName.length(); i++) {
char c = currentName.charAt(i);
if (c == '[') {
add = false;
} else if (c == ']') {
add = true;
} else if (add) {
b.append(Character.toString(c));
}
}
return b.toString();
}
}
}
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