DOM serializer : DOM Node « XML « Java

1. Java
2. XML
3. DOM Node

DOM serializer

         

import java.io.IOException;
import java.io.Writer;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentType;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class MainClass {
  static private String indent = "";
  public static Writer writer;
  public static void serialize(Document doc) throws IOException {
    serializeNode(doc, "");
    writer.flush();
  }

  private static void serializeNode(Node node, String indentLevel) throws IOException {
    switch (node.getNodeType()) {
    case Node.DOCUMENT_NODE:
      Document doc = (Document) node;
      writer.write("<?xml version=\"");
      writer.write(doc.getXmlVersion());
      writer.write("\" encoding=\"UTF-8\" standalone=\"");
      if (doc.getXmlStandalone())
        writer.write("yes");
      else
        writer.write("no");
      writer.write("\"?>\n");

      NodeList nodes = node.getChildNodes();
      if (nodes != null)
        for (int i = 0; i < nodes.getLength(); i++)
          serializeNode(nodes.item(i), "");
      break;
    case Node.ELEMENT_NODE:
      String name = node.getNodeName();
      writer.write(indentLevel + "<" + name);
      NamedNodeMap attributes = node.getAttributes();
      for (int i = 0; i < attributes.getLength(); i++) {
        Node current = attributes.item(i);
        writer.write(" " + current.getNodeName() + "=\"");
        print(current.getNodeValue());
        writer.write("\"");
      }
      writer.write(">");

      NodeList children = node.getChildNodes();
      if (children != null) {
        if ((children.item(0) != null) && (children.item(0).getNodeType() == Node.ELEMENT_NODE))
          writer.write("\n");

        for (int i = 0; i < children.getLength(); i++)
          serializeNode(children.item(i), indentLevel + indent);

        if ((children.item(0) != null)
            && (children.item(children.getLength() - 1).getNodeType() == Node.ELEMENT_NODE))
          writer.write(indentLevel);
      }

      writer.write("</" + name + ">\n");
      break;
    case Node.TEXT_NODE:
      print(node.getNodeValue());
      break;
    case Node.CDATA_SECTION_NODE:
      writer.write("CDATA");
      print(node.getNodeValue());
      writer.write("");
      break;
    case Node.COMMENT_NODE:
      writer.write(indentLevel + "<!-- " + node.getNodeValue() + " -->\n");
      break;
    case Node.PROCESSING_INSTRUCTION_NODE:
      writer.write("<?" + node.getNodeName() + " " + node.getNodeValue() + "?>\n");
      break;
    case Node.ENTITY_REFERENCE_NODE:
      writer.write("&" + node.getNodeName() + ";");
      break;
    case Node.DOCUMENT_TYPE_NODE:
      DocumentType docType = (DocumentType) node;
      String publicId = docType.getPublicId();
      String systemId = docType.getSystemId();
      String internalSubset = docType.getInternalSubset();
      writer.write("<!DOCTYPE " + docType.getName());
      if (publicId != null)
        writer.write(" PUBLIC \"" + publicId + "\" ");
      else
        writer.write(" SYSTEM ");
      writer.write("\"" + systemId + "\"");
      if (internalSubset != null)
        writer.write(" [" + internalSubset + "]");
      writer.write(">\n");
      break;
    }
  }

  private static void print(String s) throws IOException {
    if (s == null)
      return;
    for (int i = 0, len = s.length(); i < len; i++) {
      char c = s.charAt(i);
      switch (c) {
      case '<':
        writer.write("&lt;");
        break;
      case '>':
        writer.write("&gt;");
        break;
      case '&':
        writer.write("&amp;");
        break;
      case '\r':
        writer.write("&#xD;");
        break;
      default:
        writer.write(c);
      }
    }
  }

}

   
    
    
    
    
    
    
    
  

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