AutoPPRSupport

package demo.view;

import java.util.Collection;
import java.util.concurrent.atomic.AtomicInteger;

import oracle.adf.view.rich.activedata.ActiveModelContext;
import oracle.adf.view.rich.activedata.BaseActiveDataModel;
import oracle.adf.view.rich.event.ActiveDataEntry;
import oracle.adf.view.rich.event.ActiveDataUpdateEvent;

import oracle.adfinternal.view.faces.activedata.ActiveDataEventUtil;


public class AutoPPRSupport extends BaseActiveDataModel {
  private static final Object[] STATIC_KEY = { 0 };

  private final AtomicInteger changeCounter = new AtomicInteger();

  protected void startActiveData(Collection<Object> collection, int i) {
  }

  protected void stopActiveData(Collection<Object> collection) {
  }

  public int getCurrentChangeCount() {
    return changeCounter.get();
  }

  /**
   * Find out which component is currently evaluating EL to get at this attribute and remember the component for auto PPR.
   *
   * @param attributeName the name of the current attribute
   */
  public void rememberConsumerForAttribute(String attributeName) {
    ActiveModelContext.getActiveModelContext().addActiveModelInfo(this, STATIC_KEY, attributeName);
  }

  /**
   * Refresh all components that use the attribute <code>attributeName</code>
   * @param attributeName
   * @param newValue
   */
  public void notifyConsumers(String attributeName, Object newValue) {
    ActiveDataUpdateEvent event =
      ActiveDataEventUtil.buildActiveDataUpdateEvent(ActiveDataEntry.ChangeType.UPDATE, changeCounter.incrementAndGet(),
                                                     STATIC_KEY, null, new String[] { attributeName },
                                                     new Object[] { newValue });
    fireActiveDataUpdate(event);
  }
}