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Testing framework for Java
There is a newer version: 7.10.2
package org.testng.reporters;

import org.testng.internal.Nullable;

import java.io.Writer;
import java.util.Properties;
import java.util.Stack;
import java.util.regex.Pattern;

/**
 * This class allows you to generate an XML text document by pushing
 * and popping tags from a stack maintained internally.
 *
 * @author Cedric Beust Jul 21, 2003
 */
public class XMLStringBuffer {
  /** End of line, value of 'line.separator' system property or '\n' */
  private static final String EOL = System.getProperty("line.separator", "\n");

  /** Tab space indent for XML document */
  private static final String DEFAULT_INDENT_INCREMENT = "  ";

  /** The buffer to hold the xml document */
  private IBuffer m_buffer;

  /** The stack of tags to make sure XML document is well formed. */
  private final Stack m_tagStack = new Stack();

  /** A string of space character representing the current indentation. */
  private String m_currentIndent = "";

  /**
   * @param start A string of spaces indicating the indentation at which
   * to start the generation. Note that this constructor will also insert
   * an ").append(EOL);
  }

  /**
   * Set the doctype for this document.
   *
   * @param docType The DOCTYPE string, without the "<!DOCTYPE " ">"
   */
  public void setDocType(String docType) {
    m_buffer.append("" + EOL);
  }

  /**
   * Push a new tag.  Its value is stored and will be compared against the parameter
   * passed to pop().
   *
   * @param tagName The name of the tag.
   * @param schema The schema to use (can be null or an empty string).
   * @param attributes A Properties file representing the attributes (or null)
   */
  public void push(String tagName, @Nullable String schema, @Nullable Properties attributes) {
    XMLUtils.xmlOpen(m_buffer, m_currentIndent, tagName + schema, attributes);
    m_tagStack.push(new Tag(m_currentIndent, tagName, attributes));
    m_currentIndent += DEFAULT_INDENT_INCREMENT;
  }

  /**
   * Push a new tag.  Its value is stored and will be compared against the parameter
   * passed to pop().
   *
   * @param tagName The name of the tag.
   * @param schema The schema to use (can be null or an empty string).
   */
  public void push(String tagName, @Nullable String schema) {
    push(tagName, schema, null);
  }

  /**
   * Push a new tag.  Its value is stored and will be compared against the parameter
   * passed to pop().
   *
   * @param tagName The name of the tag.
   * @param attributes A Properties file representing the attributes (or null)
   */
  public void push(String tagName, @Nullable Properties attributes) {
    push(tagName, "", attributes);
  }

  public void push(String tagName, String... attributes) {
    push(tagName, createProperties(attributes));
  }

  private Properties createProperties(String[] attributes) {
    Properties result = new Properties();
    if (attributes == null) {
      return result;
    }
    if (attributes.length % 2 != 0) {
      throw new IllegalArgumentException("Arguments 'attributes' length must be even. Actual: " + attributes.length);
    }
    for (int i = 0; i < attributes.length; i += 2) {
      result.put(attributes[i], attributes[i + 1]);
    }
    return result;
  }

  /**
   * Push a new tag.  Its value is stored and will be compared against the parameter
   * passed to pop().
   *
   * @param tagName The name of the tag.
   */
  public void push(String tagName) {
    push(tagName, "");
  }

  /**
   * Pop the last pushed element without verifying it if matches the previously
   * pushed tag.
   */
  public void pop() {
    pop(null);
  }

  /**
   * Pop the last pushed element and throws an AssertionError if it doesn't
   * match the corresponding tag that was pushed earlier.
   *
   * @param tagName The name of the tag this pop() is supposed to match.
   */
  public void pop(String tagName) {
    m_currentIndent = m_currentIndent.substring(DEFAULT_INDENT_INCREMENT.length());
    Tag t = m_tagStack.pop();
    if (null != tagName) {
      if (!tagName.equals(t.tagName)) {
        // TODO Is it normal to throw an Error here?
        throw new AssertionError(
            "Popping the wrong tag: " + t.tagName + " but expected " + tagName);
      }
    }
    XMLUtils.xmlClose(m_buffer, m_currentIndent, t.tagName,
        XMLUtils.extractComment(tagName, t.properties));
  }

  /**
   * Add a required element to the current tag.  An opening and closing tag
   * will be generated even if value is null.
   * @param tagName The name of the tag
   * @param value The value for this tag
   */
  public void addRequired(String tagName, @Nullable String value) {
    addRequired(tagName, value, (Properties) null);
  }

  /**
   * Add a required element to the current tag.  An opening and closing tag
   * will be generated even if value is null.
   * @param tagName The name of the tag
   * @param value The value for this tag
   * @param attributes A Properties file containing the attributes (or null)
   */
  public void addRequired(String tagName, @Nullable String value, @Nullable Properties attributes) {
    XMLUtils.xmlRequired(m_buffer, m_currentIndent, tagName, value, attributes);
  }
  public void addRequired(String tagName, @Nullable String value, String... attributes) {
    addRequired(tagName, value, createProperties(attributes));
  }

  /**
   * Add an optional String element to the current tag.  If value is null, nothing is
   * added.
   * @param tagName The name of the tag
   * @param value The value for this tag
   * @param attributes A Properties file containing the attributes (or null)
   */
  public void addOptional(String tagName, @Nullable String value, @Nullable Properties attributes) {
    if (value != null) {
      XMLUtils.xmlOptional(m_buffer, m_currentIndent, tagName, value, attributes);
    }
  }

  public void addOptional(String tagName, @Nullable String value, String... attributes) {
    if (value != null) {
      XMLUtils.xmlOptional(m_buffer, m_currentIndent, tagName, value, createProperties(attributes));
    }
  }

  /**
   * Add an optional String element to the current tag.  If value is null, nothing is
   * added.
   * @param tagName The name of the tag
   * @param value The value for this tag
   */
  public void addOptional(String tagName, @Nullable String value) {
    addOptional(tagName, value, (Properties) null);
  }

  /**
   * Add an optional Boolean element to the current tag.  If value is null, nothing is
   * added.
   * @param tagName The name of the tag
   * @param value The value for this tag
   * @param attributes A Properties file containing the attributes (or null)
   */
  public void addOptional(String tagName, @Nullable Boolean value, @Nullable Properties attributes) {
    if (null != value) {
      XMLUtils.xmlOptional(m_buffer, m_currentIndent, tagName, value.toString(), attributes);
    }
  }

  /**
   * Add an optional Boolean element to the current tag.  If value is null, nothing is
   * added.
   * @param tagName The name of the tag
   * @param value The value for this tag
   */
  public void addOptional(String tagName, @Nullable Boolean value) {
    addOptional(tagName, value, null);
  }

  /**
   * Add an empty element tag (e.g. )
   *
   * @param tagName The name of the tag
   *
   */
  public void addEmptyElement(String tagName) {
    addEmptyElement(tagName, (Properties) null);
  }

  /**
   * Add an empty element tag (e.g. )
   * @param tagName The name of the tag
   * @param attributes A Properties file containing the attributes (or null)
   */
  public void addEmptyElement(String tagName, @Nullable Properties attributes) {
    m_buffer.append(m_currentIndent).append("<").append(tagName);
    XMLUtils.appendAttributes(m_buffer, attributes);
    m_buffer.append("/>").append(EOL);
  }

  public void addEmptyElement(String tagName, String... attributes) {
    addEmptyElement(tagName, createProperties(attributes));
  }

  public void addComment(String comment) {
    m_buffer.append(m_currentIndent).append("\n");
  }

  public void addString(String s) {
    m_buffer.append(s);
  }

  private static void ppp(String s) {
    System.out.println("[XMLStringBuffer] " + s);
  }

  /**
   * Add a CDATA tag.
   */
  public void addCDATA(String content) {
    if (content == null) {
      content = "null";
    }
    if (content.indexOf("]]>") > -1) {
      String[] subStrings = content.split("]]>");
      m_buffer.append(m_currentIndent).append("");
      for (int i = 1; i < subStrings.length - 1; i++) {
        m_buffer.append("").append(subStrings[i]).append("]]]]>");
      }
      m_buffer.append("").append(subStrings[subStrings.length - 1]).append("]]>");
      if (content.endsWith("]]>")) {
        m_buffer.append("").append("]]>");
      }
      m_buffer.append(EOL);
    } else {
      m_buffer.append(m_currentIndent).append("" + EOL);
    }
  }

  /**
   *
   * @return The StringBuffer used to create the document.
   */
  public IBuffer getStringBuffer() {
    return m_buffer;
  }

  private static final Pattern INVALID_XML_CHARS =
      Pattern.compile("[^\\u0009\\u000A\\u000D\\u0020-\\uD7FF\\uE000-\\uFFFD\uD800\uDC00-\uDBFF\uDFFF]");

  /**
   * @return The String representation of the XML for this XMLStringBuffer.
   */
  public String toXML() {
    return INVALID_XML_CHARS.matcher(m_buffer.toString()).replaceAll("");
  }

  public static void main(String[] argv) {
    IBuffer result = Buffer.create();
    XMLStringBuffer sb = new XMLStringBuffer(result, "");

    sb.push("family");
    Properties p = new Properties();
    p.setProperty("prop1", "value1");
    p.setProperty("prop2", "value2");
    sb.addRequired("cedric", "true", p);
    sb.addRequired("alois", "true");
    sb.addOptional("anne-marie", (String) null);
    sb.pop();

    System.out.println(result.toString());

    assert ("" + EOL + "true" + EOL + "true" + EOL + ""  + EOL)
      .equals(result.toString());
  }

  public String getCurrentIndent() {
    return m_currentIndent;
  }

  public void toWriter(Writer fw) {
    m_buffer.toWriter(fw);
  }
}


////////////////////////

class Tag {
  public final String tagName;
  public final String indent;
  public final Properties properties;

  public Tag(String ind, String n, Properties p) {
    tagName = n;
    indent = ind;
    properties = p;
  }

  @Override
  public String toString() {
    return tagName;
  }
}