package com.google.appengine.codelab;
import com.google.appengine.api.datastore.Entity;
import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.KeyFactory;
import com.google.appengine.api.datastore.PreparedQuery;
import com.google.appengine.api.datastore.Query;
import com.google.appengine.api.datastore.Query.Filter;
import com.google.appengine.api.datastore.Query.FilterOperator;
import com.google.appengine.api.datastore.Query.FilterPredicate;
public class Datastore {
public static PreparedQuery get(String kind, Filter filter) {
Query query = new Query(kind);
if (filter != null) {
query.setFilter(filter);
}
return Util.getDatastoreServiceInstance().prepare(query);
}
public static Entity get(String kind, long id) {
Key key = KeyFactory.createKey(kind, id);
return Util.findEntity(key);
}
public static PreparedQuery get(String kind, String propertyName, Object value) {
Query query = new Query(kind);
if ((value != null) && (!"".equals(value))) {
query.setFilter(new FilterPredicate(propertyName, FilterOperator.EQUAL, value));
}
return Util.getDatastoreServiceInstance().prepare(query);
}
}