Android Open Source - colibri Cursor

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License

The source code is released under:

Apache License

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Java Source Code

package labrom.colibri.xml;
//from  w ww.  jav  a2 s  .  c om
import java.io.IOException;
import java.io.InputStream;
import java.io.Reader;
import java.util.Iterator;
import java.util.NoSuchElementException;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;

/**
 * A cursor on an XML stream. Before using a Cursor one must define a {@link CursorDef} that describes the mapping
 * from XML elements and attributes to the Java class variables.
 * 
 * @author Romain Laboisse labrom@gmail.com
 * 
 * @param <T> The type of objects that Pulloid will create. This class must be written by developers.
 */
public class Cursor<T> implements Iterator<T>, Iterable<T> {
  

  private ElementContext<T> ctx;
  private XmlPullParser parser;
  private Reflector<T> reflector;
  
  private T next;
  
  
  protected Cursor(Reflector<T> reflector, ElementContext<T> ctx, XmlPullParser parser, InputStream input) throws XmlPullParserException {
    this.ctx = ctx;
    this.parser = parser;
    parser.setInput(input, null);
    this.reflector = reflector;
  }

  protected Cursor(Reflector<T> reflector, ElementContext<T> ctx, XmlPullParser parser, Reader input) throws XmlPullParserException {
    this.ctx = ctx;
    this.parser = parser;
    parser.setInput(input);
    this.reflector = reflector;
  }

  @Override
  public boolean hasNext() {
    try {
      if(ParserUtil.isEndDocument(parser))
        return false;
      if(ctx.position(parser) != ctx)
        return false;

      next = reflector.createObject();
      ctx.hydrate(parser, reflector);
      return true;
    } catch (XmlPullParserException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
    }
    return false;
  }
  
  public T getNext() {
    if(next != null || hasNext()) {
      T result = next;
      next = null;
      return result;
    }
    return null; // FIXME Should throw an Exception instead?
  }
  
  @Override
  public T next() {
    T next = getNext();
    if(next == null)
      throw new NoSuchElementException();
    return next;
  }
  
  @Override
  public void remove() {
    throw new UnsupportedOperationException();
  }
  
  @Override
  public Iterator<T> iterator() {
    return this;
  }
  

}

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