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Nifty GUI is a Java Library that supports the building of interactive user interfaces for games or similar applications. It utilizes OpenGL for rendering and it can be easily integrated into many rendering systems. The configuration of the GUI is stored in xml files with little supporting Java code. In short Nifty helps you to layout stuff, display it in a cool way and interact with it :)

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package de.lessvoid.xml.lwxs;

import de.lessvoid.nifty.tools.resourceloader.NiftyResourceLoader;
import de.lessvoid.xml.lwxs.elements.Element;
import de.lessvoid.xml.lwxs.elements.SubstitutionGroup;
import de.lessvoid.xml.lwxs.elements.Type;
import de.lessvoid.xml.lwxs.elements.XmlProcessorType;
import de.lessvoid.xml.lwxs.processor.IncludeProcessor;
import de.lessvoid.xml.lwxs.processor.TypeProcessor;
import de.lessvoid.xml.xpp3.Attributes;
import de.lessvoid.xml.xpp3.XmlParser;
import de.lessvoid.xml.xpp3.XmlProcessor;
import org.xmlpull.v1.XmlPullParserFactory;

import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.logging.Logger;

public class Schema implements XmlProcessor {
  @Nonnull
  private static final Logger log = Logger.getLogger(Schema.class.getName());
  @Nonnull
  private final Map < String, Type > types = new HashMap < String, Type >();
  @Nullable
  private String packageString;
  @Nullable
  private String root;
  @Nullable
  private String type;
  @Nonnull
  private final XmlPullParserFactory parserFactory;
  @Nonnull
  private final NiftyResourceLoader resourceLoader;

  public Schema(@Nonnull final XmlPullParserFactory parserFactory, @Nonnull final NiftyResourceLoader resourceLoader) {
    this.parserFactory = parserFactory;
    this.resourceLoader = resourceLoader;
  }

  @Override
  public void process(@Nonnull final XmlParser xmlParser, @Nonnull final Attributes attributes) throws Exception {
    packageString = attributes.get("package");
    if (packageString == null) {
      throw new Exception("[package] attribute is a required attribute");
    }
    root = attributes.get("root");
    if (root == null) {
      throw new Exception("[root] attribute is a required attribute");
    }
    type = attributes.get("type");
    if (type == null) {
      throw new Exception("[type] attribute is a required attribute");
    }
    xmlParser.nextTag();
    xmlParser.zeroOrMore(
        new de.lessvoid.xml.xpp3.SubstitutionGroup()
          .add("include", new IncludeProcessor(parserFactory, resourceLoader, types))
          .add("type", new TypeProcessor(this)));
  }

  public void addType(@Nonnull final String name, @Nonnull final Type typeParam) {
    types.put(name, typeParam);
  }

  @Nonnull
  public Type getType(@Nonnull final String name) throws Exception {
    Type t = types.get(name);
    if (t == null) {
      log.warning("Type [" + name + "] not found. Creating new one on the fly");
      t = new Type(name, null);
      addType(name, t);
    }
    return t;
  }

  public boolean isTypeAvailable(@Nonnull final String name) {
    return types.containsKey(name);
  }

  @Nonnull
  public XmlType loadXml(@Nonnull final XmlParser parser) throws Exception {
    if (type == null) {
      throw new Exception("The type is null, something is wrong.");
    }
    Type t = getType(type);
    XmlProcessorType xmlType = t.createXmlProcessor(this);
    parser.nextTag();
    if (root == null) {
      throw new Exception("Root element is not set.");
    }
    parser.required(root, xmlType);
    XmlType result = xmlType.getXmlType();
    if (result == null) {
      throw new Exception("Failed to resolve XML data to a proper XML type.");
    }
    return result;
  }

  @Nonnull
  public XmlProcessorType getInstance(
      @Nonnull final String className,
      @Nonnull final Collection < Element > elements,
      @Nonnull final Collection < SubstitutionGroup> substitutionGroups) throws Exception {
    XmlProcessorType processor = new XmlProcessorType(packageString + "." + className);
    for (Element child : elements) {
      child.addToProcessor(this, processor);
    }
    for (SubstitutionGroup subst : substitutionGroups) {
      subst.addToProcessor(this, processor);
    }
    return processor;
  }

  @Nonnull
  public Map < String, Type > getTypes() {
    return types;
  }
}