schema-service processing for v19

Issue-ID: AAI-2864
Change-Id: I41a430ec9c9fd69be75bd9d01693249895e0928b
Signed-off-by: LaMont, William(wl2432) <wl2432@att.com>

1 files changed, 447 insertions, 109 deletions

diff --git a/aai-schema/src/test/java/org/onap/aai/schema/ValidateOXMTest.java b/aai-schema/src/test/java/org/onap/aai/schema/ValidateOXMTest.java
index 0dcf1b3..527e6b7 100644
--- a/aai-schema/src/test/java/org/onap/aai/schema/ValidateOXMTest.java
+++ b/aai-schema/src/test/java/org/onap/aai/schema/ValidateOXMTest.java
@@ -19,16 +19,18 @@
  */
 package org.onap.aai.schema;
 
-
+import org.json.simple.JSONArray;
+import org.json.simple.JSONObject;
+import org.json.simple.parser.JSONParser;
+import org.json.simple.parser.ParseException;
 import org.apache.commons.io.FileUtils;
 import org.apache.commons.io.filefilter.DirectoryFileFilter;
 import org.apache.commons.io.filefilter.FileFileFilter;
 import org.apache.commons.io.filefilter.FileFilterUtils;
 import org.apache.commons.io.filefilter.RegexFileFilter;
 import org.junit.Test;
-import org.w3c.dom.Document;
-import org.w3c.dom.Node;
-import org.w3c.dom.NodeList;
+import org.junit.Ignore;
+import org.w3c.dom.*;
 import org.xml.sax.SAXException;
 
 import javax.xml.parsers.DocumentBuilder;
@@ -45,86 +47,99 @@ import java.nio.file.Paths;
 import java.util.*;
 import java.util.stream.Collectors;
 
+import static org.junit.Assert.assertTrue;
 import static org.junit.Assert.fail;
 
 public class ValidateOXMTest {
 
-	@Test
-	public void testFindXmlPropContainingSpace() throws XPathExpressionException, IOException, SAXException, ParserConfigurationException {
-		boolean foundIssue = false;
-		List<File> fileList = getLatestFiles();
-
-		StringBuilder msg = new StringBuilder();
-		for (File file : fileList) {
-			msg.append(file.getAbsolutePath().replaceAll(".*aai-schema", ""));
-			msg.append("\n");
-			Document xmlDocument = getDocument(file);
-			XPath xPath = XPathFactory.newInstance().newXPath();
-			String expression = "/xml-bindings/java-types/java-type/xml-properties/xml-property[@name!='description' and contains(@value,' ')]";
-			NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
-
-			for (int i = 0; i < nodeList.getLength(); i++) {
-				foundIssue = true;
-				msg.append("\t");
-				msg.append(nodeList.item(i).getParentNode().getParentNode().getAttributes().getNamedItem("name").getNodeValue());
-				msg.append("\n");
-				msg.append("\t");
-				msg.append("\n");
-			}
-
-		}
-
-		if (foundIssue) {
-			System.out.println(msg.toString());
-			fail("Node type xml-property should have space.");
-		}
-
-	}
-
-	/**
-	 * Verifies that all of the node types in the oxm's have their uri templates.
-	 * @throws XPathExpressionException
-	 * @throws IOException
-	 * @throws SAXException
-	 * @throws ParserConfigurationException
-	 */
-	@Test
-	public void allNodeTypesHaveAAIUriTemplate() throws XPathExpressionException, IOException, SAXException, ParserConfigurationException {
-		boolean foundIssue = false;
-		List<File> fileList = getFiles();
-
-		StringBuilder msg = new StringBuilder();
-		for (File file : fileList) {
-			msg.append(file.getAbsolutePath().replaceAll(".*aai-schema", ""));
-			msg.append("\n");
-			Document xmlDocument = getDocument(file);
-			XPath xPath = XPathFactory.newInstance().newXPath();
-			String expression = "/xml-bindings/java-types/java-type[" +
-					"(" +
-						"count(xml-properties/xml-property[@name='container']) > 0 " +
-						"or count(xml-properties/xml-property[@name='dependentOn']) > 0" +
-					") " +
-					"and count(xml-properties/xml-property[@name='uriTemplate']) = 0 " +
-					"]";
-			NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
-
-			for (int i = 0; i < nodeList.getLength(); i++) {
-				String name = nodeList.item(i).getAttributes().getNamedItem("name").getNodeValue();
-				if (name.equals("InstanceFilter") || name.equals("InventoryResponseItems") || name.equals("InventoryResponseItem")) {
-					continue;
-				}
-				foundIssue = true;
-				msg.append("\t");
-				msg.append(name);
-				msg.append("\n");
-			}
-		}
-		if (foundIssue) {
-			System.out.println(msg.toString());
-			fail("Missing uriTemplate in oxm.");
-		}
-
-	}
+    private String DBEDGERULES_RULES = "rules";
+    private String DBEDGERULES_FROM = "from";
+    private String DBEDGERULES_TO = "to";
+    private String DBEDGERULES_DIRECTION = "direction";
+    private String DBEDGERULES_CONTAINS_OTHER_V = "contains-other-v";
+    private String DBEDGERULES_OUT = "OUT";
+    private String DBEDGERULES_IN = "IN";
+    private String XMLROOTELEMENT = "xml-root-element";
+    private String ECOMP = "ecomp";
+    private String NARAD = "narad";
+    private String ONAP = "onap";
+
+    @Test
+    public void testFindXmlPropContainingSpace() throws XPathExpressionException, IOException, SAXException, ParserConfigurationException {
+        boolean foundIssue = false;
+        List<File> fileList = getLatestFiles();
+
+        StringBuilder msg = new StringBuilder();
+        for (File file : fileList) {
+            msg.append(file.getAbsolutePath().replaceAll(".*aai-schema", ""));
+            msg.append("\n");
+            Document xmlDocument = getDocument(file);
+            XPath xPath = XPathFactory.newInstance().newXPath();
+            String expression = "/xml-bindings/java-types/java-type/xml-properties/xml-property[@name!='description' and contains(@value,' ')]";
+            NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+            for (int i = 0; i < nodeList.getLength(); i++) {
+                foundIssue = true;
+                msg.append("\t");
+                msg.append(nodeList.item(i).getParentNode().getParentNode().getAttributes().getNamedItem("name").getNodeValue());
+                msg.append("\n");
+                msg.append("\t");
+                msg.append("\n");
+            }
+
+        }
+
+        if (foundIssue) {
+            System.out.println(msg.toString());
+            fail("Node type xml-property should have space.");
+        }
+
+    }
+
+    /**
+     * Verifies that all of the node types in the oxm's have their uri templates.
+     * @throws XPathExpressionException
+     * @throws IOException
+     * @throws SAXException
+     * @throws ParserConfigurationException
+     */
+    @Test
+    public void allNodeTypesHaveAAIUriTemplate() throws XPathExpressionException, IOException, SAXException, ParserConfigurationException {
+        boolean foundIssue = false;
+        List<File> fileList = getFiles();
+
+        StringBuilder msg = new StringBuilder();
+        for (File file : fileList) {
+            msg.append(file.getAbsolutePath().replaceAll(".*aai-schema", ""));
+            msg.append("\n");
+            Document xmlDocument = getDocument(file);
+            XPath xPath = XPathFactory.newInstance().newXPath();
+            String expression = "/xml-bindings/java-types/java-type[" +
+                "(" +
+                "count(xml-properties/xml-property[@name='container']) > 0 " +
+                "or count(xml-properties/xml-property[@name='dependentOn']) > 0" +
+                ") " +
+                "and count(xml-properties/xml-property[@name='uriTemplate']) = 0 " +
+                "]";
+            NodeList nodeList = (NodeList) xPath.compile(expression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+            for (int i = 0; i < nodeList.getLength(); i++) {
+                String name = nodeList.item(i).getAttributes().getNamedItem("name").getNodeValue();
+                if (name.equals("InstanceFilter") || name.equals("InventoryResponseItems") || name.equals("InventoryResponseItem")) {
+                    continue;
+                }
+                foundIssue = true;
+                msg.append("\t");
+                msg.append(name);
+                msg.append("\n");
+            }
+        }
+        if (foundIssue) {
+            System.out.println(msg.toString());
+            fail("Missing uriTemplate in oxm.");
+        }
+
+    }
 
 
     /**
@@ -186,17 +201,309 @@ public class ValidateOXMTest {
 
     }
 
-	private List<File> getFiles() {
-		Path currentRelativePath = Paths.get("../aai-schema/src/main/resources/").toAbsolutePath();
-		return FileUtils.listFiles(
-				currentRelativePath.toFile(),
-				new RegexFileFilter(".*\\.xml"),
-				DirectoryFileFilter.DIRECTORY)
-				.stream()
-				.filter(file -> file.getAbsolutePath().contains("oxm"))
-				.filter(file -> !file.getAbsolutePath().contains("onap")) // skips onap for checks
-				.collect(Collectors.toList());
-	}
+    /**
+     * Check schema versions against their respective dbEdgeRules file and check if the
+     * dependentOn relationship matches what is listed in the edge rules.
+     *
+     */
+    @Test
+    @Ignore
+    public void testSchemaValidationAgainstEdgeRules() throws  XPathExpressionException, IOException, SAXException, ParserConfigurationException, ParseException {
+        Path currentRelativePath = Paths.get("../aai-schema/src/main/resources/").toAbsolutePath();
+        List<File> subDirs = Arrays.asList(currentRelativePath.toFile().listFiles(File::isDirectory));
+        boolean success = true;
+        for (File subDir : subDirs) {
+            List<String> oxmSchemaList = new ArrayList<>();
+            List<String> dbEdgeRulesList = new ArrayList<>();
+            String oxm = subDir.getAbsolutePath() + "/oxm";
+            File[] oxms = new File(oxm).listFiles(File::isDirectory);
+            Arrays.stream(oxms).map(File::getAbsolutePath).max(new Comparator<String>() {
+                public int compare(String o1, String o2) {
+                    return extractInt(o1) - extractInt(o2);
+                }
+
+                int extractInt(String s) {
+                    String num = s.replaceAll("\\D", "");
+                    return num.isEmpty() ? 0 : Integer.parseInt(num);
+                }
+            }).ifPresent(oxmSchemaList::add);
+
+            String edgeRule = subDir.getAbsolutePath() + "/dbedgerules";
+            File[] edgeRules = new File(edgeRule).listFiles(File::isDirectory);
+            Arrays.stream(edgeRules).map(File::getAbsolutePath).max(new Comparator<String>() {
+                public int compare(String o1, String o2) {
+                    return extractInt(o1) - extractInt(o2);
+                }
+
+                int extractInt(String s) {
+                    String num = s.replaceAll("\\D", "");
+                    return num.isEmpty() ? 0 : Integer.parseInt(num);
+                }
+            }).ifPresent(dbEdgeRulesList::add);
+
+
+            List<File> oxmSchemaFileList = new ArrayList<>();
+            List<File> dbEdgeRulesFileList = new ArrayList<>();
+            oxmSchemaList.forEach(s ->
+                FileUtils.listFiles(
+                    new File(s),
+                    new RegexFileFilter(".*\\.xml"),
+                    DirectoryFileFilter.DIRECTORY)
+                    .stream()
+                    .filter(file -> file.getAbsolutePath().contains("oxm"))
+                    .forEach(oxmSchemaFileList::add));
+
+            dbEdgeRulesList.forEach(s ->
+                FileUtils.listFiles(
+                    new File(s),
+                    new RegexFileFilter(".*\\.json"),
+                    DirectoryFileFilter.DIRECTORY)
+                    .stream()
+                    .filter(file -> file.getAbsolutePath().contains("DbEdgeRules"))
+                    .forEach(dbEdgeRulesFileList::add));
+
+            // Map the dbEdgeRules json file into a HashMap for reference
+            Map<String, Set<String>> dbEdgeRules = new HashMap<>();
+            JSONParser jsonParser = new JSONParser();
+            for (File file : dbEdgeRulesFileList) {
+                FileReader reader = new FileReader(file);
+                // Read JSON file. Expecting JSON file to read an object with a JSONArray names "rules"
+                JSONObject jsonObj = (JSONObject) jsonParser.parse(reader);
+                JSONArray rules = (JSONArray) jsonObj.get(DBEDGERULES_RULES);
+                for (int i = 0; i < rules.size(); i++) {
+                    JSONObject rule = (JSONObject) rules.get(i);
+                    String fromNode = rule.get(DBEDGERULES_FROM).toString();
+                    String toNode = rule.get(DBEDGERULES_TO).toString();
+                    String direction = rule.get(DBEDGERULES_DIRECTION).toString();
+                    String containsOtherV = rule.get(DBEDGERULES_CONTAINS_OTHER_V).toString();
+
+                    // special case - cvlan-tag should be replaced with cvlan-tag-entry
+                    if (fromNode.equals("cvlan-tag"))
+                        fromNode = "cvlan-tag-entry";
+                    if (toNode.equals("cvlan-tag"))
+                        toNode = "cvlan-tag-entry";
+                    if (containsOtherV.equals("!${direction}")) {
+                        if (direction.equals(DBEDGERULES_IN)) {
+                            direction = DBEDGERULES_OUT;
+                        } else if (direction.equals(DBEDGERULES_OUT)) {
+                            direction = DBEDGERULES_IN;
+                        }
+                    }
+                    // If this value is none, the edge rule is for cousin nodes. Ignore.
+                    else if (containsOtherV.equals("NONE"))
+                        continue;
+                    dbEdgeRulesMapPut(dbEdgeRules, fromNode, toNode, direction);
+                }
+            }
+
+            // Iterate through the most recent oxm schema files. Map the parent child relationships
+            Map<String, Set<String>> oxmSchemaFile = new HashMap<>();
+            for (File file : oxmSchemaFileList) {
+                Document xmlDocument = getDocument(file);
+                XPath xPath = XPathFactory.newInstance().newXPath();
+                String parentNodeExpression = "/xml-bindings/java-types/java-type/xml-properties/xml-property[@name='dependentOn']";
+                NodeList parentNodeList = (NodeList) xPath.compile(parentNodeExpression).evaluate(xmlDocument, XPathConstants.NODESET);
+                String childNodeExpression = "/xml-bindings/java-types/java-type[" +
+                    "(" +
+                    "count(xml-properties/xml-property[@name='dependentOn']) > 0" +
+                    ")]";
+                NodeList childNodeList = (NodeList) xPath.compile(childNodeExpression).evaluate(xmlDocument, XPathConstants.NODESET);
+
+                for (int i = 0; i < parentNodeList.getLength(); i++) {
+
+                    // Obtain the xml-root-element field by tracing the childNodes from the java-type parent node
+                    for (int j = 0; j < childNodeList.item(i).getChildNodes().getLength(); j++) {
+                        if (childNodeList.item(i).getChildNodes().item(j).getNodeName().equals(XMLROOTELEMENT)) {
+
+                            // The parent node
+                            String dependentOn = parentNodeList.item(i).getAttributes().getNamedItem("value").getNodeValue();
+
+                            // The child node
+                            String xmlRootElement = childNodeList.item(i).getChildNodes().item(j).getAttributes().getNamedItem("name").getNodeValue();
+
+                            Set<String> childSet;
+                            String[] parents = dependentOn.split(",");
+                            for (int k = 0; k < parents.length; k++) {
+                                String parent = parents[k];
+                                if (oxmSchemaFile.containsKey(parent)) {
+                                    childSet = oxmSchemaFile.get(parent);
+                                } else {
+                                    childSet = new HashSet<>();
+                                }
+                                childSet.add(xmlRootElement);
+                                oxmSchemaFile.put(parent, childSet);
+                            }
+
+                        }
+                    }
+                }
+            }
+
+            // Compare the OXM file against the dbEdgeRules file. check what is missing in dbEdgeRules from the oxm files.
+            Set<String> oxmKeySet = oxmSchemaFile.keySet();
+            for (String key : oxmKeySet) {
+                Set<String> oxmChildren = oxmSchemaFile.get(key);
+                Set<String> dbEdgeRulesChildren = dbEdgeRules.get(key);
+
+                // Check if the parent vertex exists at all in the dbEdgeRules file
+                if (dbEdgeRulesChildren == null || dbEdgeRulesChildren.isEmpty()) {
+                    for (String oxmChild : oxmChildren) {
+                        System.out.println("ERROR: dbEdgeRules under directory '" + subDir.toString() + "' does not contain parent '" + key + "' and child '" + oxmChild + "' relationship");
+                    }
+                    success = false;
+                    continue;
+                }
+
+                // Compare both parent-child relationships between both files
+                if (!oxmChildren.equals(dbEdgeRulesChildren)) {
+                    for (String oxmChild : oxmChildren) {
+                        if (!dbEdgeRulesChildren.contains(oxmChild)) {
+                            System.out.println("ERROR: dbEdgeRules under directory '" + subDir.toString() + "' does not contain parent '" + key + "' and child '" + oxmChild + "' relationship");
+                            success = false;
+                        }
+                    }
+                }
+            }
+
+            // Compare the dbEdgeRules against the OXM File
+            Set<String> dbEdgeRuleKeySet = dbEdgeRules.keySet();
+            for (String key : dbEdgeRuleKeySet) {
+                Set<String> dbEdgeRulesChildren = dbEdgeRules.get(key);
+                Set<String> oxmChildren = oxmSchemaFile.get(key);
+
+                // Check if the parent vertex exists at all in the dbEdgeRules file
+                if (oxmChildren == null || oxmChildren.isEmpty()) {
+                    for (String dbEdgeRuleChild : dbEdgeRulesChildren) {
+                        System.out.println("ERROR: oxms under directory '" + subDir.toString() + "' do not contain parent '" + key + "' and child '" + dbEdgeRuleChild + "' relationship");
+                    }
+                    success = false;
+                    continue;
+                }
+
+                // Compare both parent-child relationships between both files
+                if (!dbEdgeRulesChildren.equals(oxmChildren)) {
+                    for (String dbEdgeRuleChild : dbEdgeRulesChildren) {
+                        if (!oxmChildren.contains(dbEdgeRuleChild)) {
+                            System.out.println("ERROR: oxms under directory '" + subDir.toString() + "' do not contain parent '" + key + "' and child '" + dbEdgeRuleChild + "' relationship");
+                            success = false;
+                        }
+                    }
+                }
+            }
+        }
+        assertTrue(success);
+    }
+
+    /**
+     * Null check for strings
+     * @param s
+     * @return
+     */
+    private boolean isStringEmpty(String s) {
+        return (s == null || s.isEmpty()) ? true : false;
+    }
+
+    /**
+     * Creating a hashmap to map what child nodes are associated to which parent nodes
+     * according to the dbEdgeRules json files. A HashMap was chosen for the value of the map for O(1) lookup time.
+     * @param from this variable will act as the key or value depending on the direction
+     * @param to this variable will act as the key or value depending on the direction
+     * @param direction dictates the direction of which vertex is dependent on which
+     * @return The map returned will act as a dictionary to keep track of the parent nodes. Value of the map is a hashmap to help handle collision of multiple children to one parent
+     */
+    private Map<String, Set<String>> dbEdgeRulesMapPut(Map<String, Set<String>> dbEdgeRules, String from, String to, String direction) {
+        if (isStringEmpty(from) || isStringEmpty(to) || isStringEmpty(direction))
+            return dbEdgeRules;
+
+        // Assigning the strings to parent and child for readability
+        String parent = "", child = "";
+        if (direction.equals(DBEDGERULES_OUT)) {
+            parent = from;
+            child = to;
+        } else if (direction.equals(DBEDGERULES_IN)) {
+            parent = to;
+            child = from;
+        }
+        // Add to the dbEdgeRules mapping
+        Set<String> children;
+        if (!dbEdgeRules.containsKey(parent)) {
+            children = new HashSet<>();
+            children.add(child);
+            dbEdgeRules.put(parent, children);
+        } else {
+            children = dbEdgeRules.get(parent);
+            children.add(child);
+            dbEdgeRules.put(parent, children);
+        }
+        return dbEdgeRules;
+    }
+
+    private List<File> getFiles() {
+        Path currentRelativePath = Paths.get("../aai-schema/src/main/resources/").toAbsolutePath();
+        return FileUtils.listFiles(
+            currentRelativePath.toFile(),
+            new RegexFileFilter(".*\\.xml"),
+            DirectoryFileFilter.DIRECTORY)
+            .stream()
+            .filter(file -> file.getAbsolutePath().contains("oxm"))
+            .filter(file -> !file.getAbsolutePath().contains("onap")) // skips onap for checks
+            .collect(Collectors.toList());
+    }
+
+    private List<File> getAaiSchemaOxmFiles() {
+        Path currentRelativePath = Paths.get("../aai-schema/src/main/resources/").toAbsolutePath();
+        return FileUtils.listFiles(
+            currentRelativePath.toFile(),
+            new RegexFileFilter(".*\\.xml"),
+            DirectoryFileFilter.DIRECTORY)
+            .stream()
+            .filter(file -> file.getAbsolutePath().contains("oxm"))
+            .filter(file -> !file.getAbsolutePath().contains("onap")) // skips onap for checks
+            .collect(Collectors.toList());
+    }
+
+    private List<File> getDbEdgeRulesFiles() {
+        Path currentRelativePath = Paths.get("../aai-schema/src/main/resources/").toAbsolutePath();
+        return FileUtils.listFiles(
+            currentRelativePath.toFile(),
+            new RegexFileFilter(".*\\.json"),
+            DirectoryFileFilter.DIRECTORY)
+            .stream()
+            .filter(file -> file.getAbsolutePath().contains("DbEdgeRules"))
+            .filter(file -> !file.getAbsolutePath().contains("onap")) // skips onap for checks
+            .collect(Collectors.toList());
+    }
+
+    /**
+     * Finds all of the oxm files for the latest version.
+     * @return list of the latest version of the oxm files.
+     */
+    private List<File> getLatestDbEdgeRulesFiles(String fileDirectory) {
+        List<String> latest = new ArrayList<>();
+        String currentRelativePath = Paths.get("../aai-schema/src/main/resources/" + fileDirectory + "/dbedgerules").toAbsolutePath().toString();
+        File[] oxms = new File(currentRelativePath).listFiles(File::isDirectory);
+        Arrays.stream(oxms).map(File::getAbsolutePath).max(new Comparator<String>() {
+            public int compare(String o1, String o2) {
+                return extractInt(o1) - extractInt(o2);
+            }
+            int extractInt(String s) {
+                String num = s.replaceAll("\\D", "");
+                return num.isEmpty() ? 0 : Integer.parseInt(num);
+            }
+        }).ifPresent(latest::add);
+
+        List<File> latestFiles = new ArrayList<>();
+        latest.forEach(s ->
+            FileUtils.listFiles(
+                new File(s),
+                new RegexFileFilter(".*\\.json"),
+                DirectoryFileFilter.DIRECTORY)
+                .stream()
+                .filter(file -> file.getAbsolutePath().contains("DbEdgeRules"))
+                .forEach(latestFiles::add));
+
+        return latestFiles;
+    }
 
     /**
      * Finds all of the oxm files for the latest version.
@@ -233,29 +540,60 @@ public class ValidateOXMTest {
         return latestFiles;
     }
 
-	//TODO test that all oxm xml are valid xml
+    /**
+     * Finds all of the oxm files for the latest version.
+     * @return list of the latest version of the oxm files.
+     */
+    private List<File> getLatestFiles(String fileDirectory) {
+        List<String> latest = new ArrayList<>();
+        String currentRelativePath = Paths.get("../aai-schema/src/main/resources/" + fileDirectory + "/oxm").toAbsolutePath().toString();
+        File[] oxms = new File(currentRelativePath).listFiles(File::isDirectory);
+        Arrays.stream(oxms).map(File::getAbsolutePath).max(new Comparator<String>() {
+            public int compare(String o1, String o2) {
+                return extractInt(o1) - extractInt(o2);
+            }
+            int extractInt(String s) {
+                String num = s.replaceAll("\\D", "");
+                return num.isEmpty() ? 0 : Integer.parseInt(num);
+            }
+        }).ifPresent(latest::add);
 
+        List<File> latestFiles = new ArrayList<>();
+        latest.forEach(s ->
+            FileUtils.listFiles(
+                new File(s),
+                new RegexFileFilter(".*\\.xml"),
+                DirectoryFileFilter.DIRECTORY)
+                .stream()
+                .filter(file -> file.getAbsolutePath().contains("oxm"))
+                .forEach(latestFiles::add));
 
+        return latestFiles;
+    }
+
+    //TODO test that all oxm xml are valid xml
 
-	public String printNodeList(NodeList nodeList, Document doc) throws IOException {
-		StringBuilder stringBuilder = new StringBuilder();
-		for (int i = 0; i < nodeList.getLength(); i++) {
-			stringBuilder.append(printNode(nodeList.item(i), doc)).append("\n");
-		}
-		return stringBuilder.toString();
-	}
 
-	public String printNode(Node node, Document document) throws IOException {
-		StringWriter stringWriter = new StringWriter();
-		return stringWriter.toString();
 
-	}
+    public String printNodeList(NodeList nodeList, Document doc) throws IOException {
+        StringBuilder stringBuilder = new StringBuilder();
+        for (int i = 0; i < nodeList.getLength(); i++) {
+            stringBuilder.append(printNode(nodeList.item(i), doc)).append("\n");
+        }
+        return stringBuilder.toString();
+    }
 
-	private Document getDocument(File file) throws ParserConfigurationException, SAXException, IOException {
-		InputStream fileIS = new FileInputStream(file);
-		DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
-		DocumentBuilder builder = builderFactory.newDocumentBuilder();
-		return builder.parse(fileIS);
-	}
+    public String printNode(Node node, Document document) throws IOException {
+        StringWriter stringWriter = new StringWriter();
+        return stringWriter.toString();
+
+    }
+
+    private Document getDocument(File file) throws ParserConfigurationException, SAXException, IOException {
+        InputStream fileIS = new FileInputStream(file);
+        DocumentBuilderFactory builderFactory = DocumentBuilderFactory.newInstance();
+        DocumentBuilder builder = builderFactory.newDocumentBuilder();
+        return builder.parse(fileIS);
+    }
 
 }