io.ebeaninternal.server.deploy.BeanCollectionUtil Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of ebean Show documentation

composite of common runtime dependencies for all platforms

There is a newer version: 15.8.1

package io.ebeaninternal.server.deploy;

import java.util.Collection;
import java.util.Map;

import javax.persistence.PersistenceException;

import io.ebean.bean.BeanCollection;

/**
 * Utility methods for BeanCollections.
 */
public class BeanCollectionUtil {

  /**
   * Return the details of the collection or map taking care to avoid
   * unnecessary fetching of the data.
   */
  public static Collection getActualEntries(Object o) {
    if (o == null) {
      return null;
    }
    if (o instanceof BeanCollection) {
      BeanCollection bc = (BeanCollection) o;
      if (!bc.isPopulated()) {
        return null;
      }
      // For maps this is a collection of Map.Entry, otherwise it
      // returns a collection of beans
      return bc.getActualEntries();
    }

    if (o instanceof Map) {
      // yes, we want the entrySet (to set the keys)
      return ((Map) o).entrySet();

    } else if (o instanceof Collection) {
      return ((Collection) o);
    }
    throw new PersistenceException("expecting a Map or Collection but got [" + o.getClass().getName() + "]");
  }
}