/*
* 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.
*/
package org.atteo.xmlcombiner;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.StringWriter;
import java.nio.charset.StandardCharsets;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.List;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import static org.assertj.core.api.Assertions.assertThat;
import org.custommonkey.xmlunit.Diff;
import static org.custommonkey.xmlunit.XMLAssert.assertXMLIdentical;
import static org.custommonkey.xmlunit.XMLAssert.assertXMLNotEqual;
import org.junit.Test;
import org.w3c.dom.Attr;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.xml.sax.SAXException;
import com.google.common.collect.Lists;
import com.google.common.io.Files;
public class XmlCombinerTest {
@Test
public void identity() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String content = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(content, combineWithIdKey(content, content)), true);
}
@Test
public void mergeChildren() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void appendChildren() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1' combine.children='append'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void commentPropagation() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <!-- Service 1 -->\n"
+ " <service id='1'>\n"
+ " <!-- This comment will be removed -->\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <!-- Service 1 with different configuration -->\n"
+ " <service id='1'>\n"
+ " <!-- Changed value -->\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ " <!-- End of configuration file -->\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <!-- Service 1 with different configuration -->\n"
+ " <service id='1'>\n"
+ " <!-- Changed value -->\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ " <!-- End of configuration file -->\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void attributes() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1' parameter='parameter' parameter2='parameter2'/>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1' parameter='other value' parameter3='parameter3'/>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1' parameter='other value' parameter2='parameter2' parameter3='parameter3'/>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void remove() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ " <service id='2' combine.self='remove'/>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1' combine.self='remove'/>\n"
+ " <service id='2'/>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='2'/>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void override() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1' combine.self='override'>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>other value</parameter>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void multipleChildren() throws SAXException, IOException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter9>parameter2</parameter9>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter9>parameter2</parameter9>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void defaults() throws SAXException, IOException, ParserConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1' combine.self='DEFAULTS'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter9>parameter2</parameter9>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ " <service id='2' combine.self='DEFAULTS'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='2'>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='2'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
}
@Test
public void overridable() throws SAXException, IOException, ParserConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='id1' combine.self='overridable'>\n"
+ " <test/>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='id1'>\n"
+ " <test/>\n"
+ " </service>\n"
+ "</config>";
String dominant2 = "\n"
+ "<config>\n"
+ " <service id='id1'/>\n"
+ "</config>";
String dominant3 = "\n"
+ "<config>\n"
+ " <service id='id2'/>\n"
+ "</config>";
String result3 = "\n"
+ "<config>\n"
+ " <service id='id1'>\n"
+ " <test/>\n"
+ " </service>\n"
+ " <service id='id2'/>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
assertXMLIdentical(new Diff(dominant2, combineWithIdKey(recessive, dominant2)), true);
assertXMLIdentical(new Diff(result3, combineWithIdKey(recessive, dominant3)), true);
assertXMLIdentical(new Diff(result3, combineWithIdKey(recessive, dominant, dominant3)), true);
}
@Test
public void overridableByTag() throws SAXException, IOException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='id1' combine.self='overridable_by_tag'>\n"
+ " <test/>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='id1'>\n"
+ " <test/>\n"
+ " </service>\n"
+ "</config>";
String dominant2 = "\n"
+ "<config>\n"
+ " <service id='id1'/>\n"
+ "</config>";
String dominant3 = "\n"
+ "<config>\n"
+ " <service id='id2'/>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
assertXMLIdentical(new Diff(dominant2, combineWithIdKey(recessive, dominant2)), true);
assertXMLIdentical(new Diff(dominant3, combineWithIdKey(recessive, dominant3)), true);
}
@Test
public void subnodes() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<outer>\n"
+ " <inner>\n"
+ " content\n"
+ " </inner>\n"
+ " <inner2>\n"
+ " content2\n"
+ " </inner2>\n"
+ "</outer>";
String dominant = "\n"
+ "<outer>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ "</outer>";
String result = "\n"
+ "<outer>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ " <inner2>\n"
+ " content2\n"
+ " </inner2>\n"
+ "</outer>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, dominant)), true);
String dominant2 = "\n"
+ "<outer combine.children='APPEND'>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ "</outer>";
String result2 = "\n"
+ "<outer>\n"
+ " <inner>\n"
+ " content\n"
+ " </inner>\n"
+ " <inner2>\n"
+ " content2\n"
+ " </inner2>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ "</outer>";
assertXMLIdentical(new Diff(result2, combineWithIdKey(recessive, dominant2)), true);
String dominant3 = "\n"
+ "<outer combine.self='override'>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ "</outer>";
String result3 = "\n"
+ "<outer>\n"
+ " <inner>\n"
+ " content3\n"
+ " </inner>\n"
+ "</outer>";
assertXMLIdentical(new Diff(result3, combineWithIdKey(recessive, dominant3)), true);
}
@Test
public void threeDocuments() throws SAXException, IOException, ParserConfigurationException,
TransformerConfigurationException, TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1' combine.self='DEFAULTS'>\n"
+ " <parameter>parameter</parameter>\n"
+ " </service>\n"
+ " <service id='2' combine.self='DEFAULTS'>\n"
+ " <parameter>parameter</parameter>\n"
+ " </service>\n"
+ " <service id='3'>\n"
+ " <parameter>parameter</parameter>\n"
+ " </service>\n"
+ "</config>";
String middle = "\n"
+ "<config>\n"
+ " <service id='1' combine.self='DEFAULTS'>\n"
+ " <parameter3>parameter3</parameter3>\n"
+ " </service>\n"
+ " <service id='2' combine.self='DEFAULTS'>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ " <service id='3' combine.self='DEFAULTS'>\n"
+ " <parameter2>parameter</parameter2>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='2'>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='2'>\n"
+ " <parameter>parameter</parameter>\n"
+ " <parameter2>parameter2</parameter2>\n"
+ " </service>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithIdKey(recessive, middle, dominant)), true);
}
@Test
public void shouldWorkWithCustomKeys() throws IOException, SAXException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service name='a'>\n"
+ " <parameter>old value2</parameter>\n"
+ " </service>\n"
+ " <service name='b'>\n"
+ " <parameter>old value</parameter>\n"
+ " </service>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service name='b'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " <service name='a'>\n"
+ " <parameter>new value2</parameter>\n"
+ " </service>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service name='a'>\n"
+ " <parameter>new value2</parameter>\n"
+ " </service>\n"
+ " <service name='b'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ "</config>";
assertXMLNotEqual(result, combineWithIdKey(recessive, dominant));
assertXMLNotEqual(result, combineWithKey("n", recessive, dominant));
assertXMLIdentical(new Diff(result, combineWithKey("name", recessive, dominant)), true);
}
@Test
public void shouldWorkWithCustomIdAttribute2() throws IOException, SAXException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <nested>\n"
+ " <service name='a'>\n"
+ " <parameter>old value2</parameter>\n"
+ " </service>\n"
+ " </nested>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <nested>\n"
+ " <service name='a'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " </nested>\n"
+ "</config>";
String result = dominant;
assertXMLIdentical(new Diff(result, combineWithKey("name", recessive, dominant)), true);
}
@Test
public void shouldSupportManyCustomKeys() throws IOException, SAXException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <nested>\n"
+ " <service name='a'>\n"
+ " <parameter>old value2</parameter>\n"
+ " </service>\n"
+ " <service name='b' id='2'>\n"
+ " <parameter>old value2</parameter>\n"
+ " </service>\n"
+ " </nested>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <nested>\n"
+ " <service name='a' id='2'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " <service name='b' id='2'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " </nested>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <nested>\n"
+ " <service name='a'>\n"
+ " <parameter>old value2</parameter>\n"
+ " </service>\n"
+ " <service name='b' id='2'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " <service name='a' id='2'>\n"
+ " <parameter>new value</parameter>\n"
+ " </service>\n"
+ " </nested>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithKeys(Lists.newArrayList("name", "id"),
recessive, dominant)), true);
}
@Test
public void shouldAllowToSpecifyKeys() throws IOException, SAXException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested combine.keys='id'>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " </nested>\n"
+ " </nested>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested combine.keys='name'>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " </nested>\n"
+ " </nested>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <nested>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ " </nested>\n"
+ " </nested>\n"
+ " <service id='1'/>\n"
+ " <service id='2'/>\n"
+ "</config>";
assertXMLIdentical(new Diff(result, combineWithKey("", recessive, dominant)), true);
}
@Test
public void shouldAllowToSpecifyArtificialKey() throws IOException, SAXException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service combine.id='1' name='a'/>\n"
+ " <service combine.id='2' name='b'/>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service combine.id='1' name='c'/>\n"
+ " <service combine.id='3' name='d'/>\n"
+ "</config>";
String result = "\n"
+ "<config>\n"
+ " <service name='c'/>\n"
+ " <service name='b'/>\n"
+ " <service name='d'/>\n"
+ "</config>";
//System.out.println(combineWithKey("", recessive, dominant));
assertXMLIdentical(new Diff(result, combineWithKey("", recessive, dominant)), true);
}
@Test
public void shouldSupportFilters() throws SAXException, IOException, ParserConfigurationException,
TransformerException {
String recessive = "\n"
+ "<config>\n"
+ " <service combine.id='1' value='1'/>\n"
+ " <service combine.id='2' value='2'/>\n"
+ "</config>";
String dominant = "\n"
+ "<config>\n"
+ " <service combine.id='1' value='10'/>\n"
+ " <service combine.id='3' value='20'/>\n"
+ "</config>";
String result = "\n"
+ "<config processed='true'>\n"
+ " <service value='11' processed='true'/>\n"
+ " <service value='2' processed='true'/>\n"
+ " <service value='20' processed='true'/>\n"
+ "</config>";
XmlCombiner.Filter filter = new XmlCombiner.Filter() {
@Override
public void postProcess(Element recessive, Element dominant, Element result) {
result.setAttribute("processed", "true");
if (recessive == null || dominant == null) {
return;
}
Attr recessiveNode = recessive.getAttributeNode("value");
Attr dominantNode = dominant.getAttributeNode("value");
if (recessiveNode == null || dominantNode == null) {
return;
}
int recessiveValue = Integer.parseInt(recessiveNode.getValue());
int dominantValue = Integer.parseInt(dominantNode.getValue());
result.setAttribute("value", Integer.toString(recessiveValue + dominantValue));
}
};
//System.out.println(combineWithKeysAndFilter(Lists.<String>newArrayList(), filter, recessive, dominant));
assertXMLIdentical(new Diff(result, combineWithKeysAndFilter(Lists.<String>newArrayList(), filter, recessive,
dominant)), true);
}
@Test
public void shouldSupportReadingAndStoringFiles() throws IOException, ParserConfigurationException, SAXException,
TransformerException {
// given
Path input = Paths.get("target/test.in");
Path output = Paths.get("target/test.out");
Files.write("<config/>", input.toFile(), StandardCharsets.UTF_8);
// when
XmlCombiner combiner = new XmlCombiner();
combiner.combine(input);
combiner.buildDocument(output);
List<String> lines = Files.readLines(output.toFile(), StandardCharsets.UTF_8);
// then
assertThat(lines).hasSize(1);
assertThat(lines.iterator().next()).contains("<config/>");
}
private static String combineWithIdKey(String... inputs) throws IOException,
ParserConfigurationException, SAXException, TransformerConfigurationException,
TransformerException {
return combineWithKey("id", inputs);
}
private static String combineWithKey(String keyAttributeName, String... inputs) throws IOException,
ParserConfigurationException, SAXException, TransformerConfigurationException,
TransformerException {
return combineWithKeys(Lists.newArrayList(keyAttributeName), inputs);
}
private static String combineWithKeys(List<String> keyAttributeNames, String... inputs) throws IOException,
ParserConfigurationException, SAXException, TransformerConfigurationException,
TransformerException {
XmlCombiner combiner = new XmlCombiner(keyAttributeNames);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
for (String input : inputs) {
Document document = builder.parse(new ByteArrayInputStream(input.getBytes("UTF-8")));
combiner.combine(document);
}
Document result = combiner.buildDocument();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(result), new StreamResult(writer));
return writer.toString();
}
private static String combineWithKeysAndFilter(List<String> keyAttributeNames, XmlCombiner.Filter filter,
String... inputs) throws IOException, ParserConfigurationException, SAXException,
TransformerConfigurationException, TransformerException {
XmlCombiner combiner = new XmlCombiner(keyAttributeNames);
combiner.setFilter(filter);
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
for (String input : inputs) {
Document document = builder.parse(new ByteArrayInputStream(input.getBytes("UTF-8")));
combiner.combine(document);
}
Document result = combiner.buildDocument();
Transformer transformer = TransformerFactory.newInstance().newTransformer();
StringWriter writer = new StringWriter();
transformer.transform(new DOMSource(result), new StreamResult(writer));
return writer.toString();
}
}
