Android Open Source - colibri Reflector

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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  ww w  .ja va 2  s.com*/
import java.util.HashMap;


/**
 * Is responsible for instantiating objects in a {@link Cursor}.
 * This can be done in three different ways:<ol>
 * <li>By instantiating a class (use {@link #Reflector(Class)})</li>
 * <li>By using a {@link ObjectFactory} (use {@link #Reflector(ObjectFactory)})</li>
 * <li>By creating a Map (use {@link #Reflector()})</li>
 * </ol>
 * 
 * @author Romain Laboisse labrom@gmail.com
 *
 * @param <T> The type of objects to create. If this Reflector is intended to work with a Map, T MUST be Map<String, Object> for things to work as expected.
 */
public class Reflector<T> {


  T object;
  private Class<T> clazz;
  private ObjectFactory<T> factory;
  
  /**
   * This reflector will use a Map. This is the same as calling any of the
   * other constructors will a null argument.
   */
  public Reflector() {
    // In this case we'll use a map
  }
  
  /**
   * 
   * @param clazz The class to instantiate. If null, will use a Map (same a {@link #Reflector()}).
   */
  public Reflector(Class<T> clazz) {
    this.clazz = clazz;
  }
  
  /**
   * 
   * @param f The object factory. If null, will use a Map (same a {@link #Reflector()}).
   */
  public Reflector(ObjectFactory<T> f) {
    this.factory = f;
  }
  
  
  @SuppressWarnings("unchecked")
  T createObject() {
    // If there's a factory, use it
    if(factory != null) {
      object =  factory.createObject();
      return object;
    }
    
    // If there's no class, use a Map
    if(clazz == null) {
      // T must be Map<String, Object> for things to work as expected.
      object = (T)new HashMap<String, Object>();
      return object;
    }
    
    // There's a class, try to instantiate from it
    try {
      object = clazz.newInstance();
    } catch (IllegalAccessException e) {
      throw new CursorException(e);
    } catch (InstantiationException e) {
      throw new CursorException(e);
    }
    return object;
  }
  
  public void set(FieldSetter<T> setter, Object value) {
    setter.set(object, value);
  }
  

}

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