/**
* @return a set of fetch options for the current limit and offset, or null if there is no limit
* or offset.
*/
private FetchOptions fetchOptions() {
// The FetchOptions builder interface is really, really awful
if (this.cursor != null) {
FetchOptions opts = FetchOptions.Builder.withCursor(this.cursor);
if (this.limit != 0) opts = opts.limit(this.limit);
if (this.offset != 0) opts = opts.offset(this.offset);
return opts;
} else if (this.limit != 0) {
FetchOptions opts = FetchOptions.Builder.withLimit(this.limit);
if (this.offset != 0) opts = opts.offset(this.offset);
return opts;
} else if (this.offset != 0) {
FetchOptions opts = FetchOptions.Builder.withOffset(this.offset);
return opts;
} else {
return null;
}
}
/* (non-Javadoc)
* @see com.googlecode.objectify.Query#getKey()
*/
@Override
public Key<T> getKey() {
FetchOptions opts = FetchOptions.Builder.withLimit(1);
if (this.offset > 0) opts = opts.offset(this.offset);
Iterator<Entity> it = this.prepareKeysOnly().asIterator(opts);
if (it.hasNext()) {
Entity ent = it.next();
return this.factory.rawKeyToTypedKey(ent.getKey());
} else {
return null;
}
}
/**
* @return a set of fetch options for the current limit, offset, and cursors, based on the default
* fetch options. There will always be options even if default.
*/
private FetchOptions fetchOptions() {
FetchOptions opts = FetchOptions.Builder.withDefaults();
if (this.startAt != null) opts = opts.startCursor(this.startAt);
if (this.endAt != null) opts = opts.endCursor(this.endAt);
if (this.limit != 0) opts = opts.limit(this.limit);
if (this.offset != 0) opts = opts.offset(this.offset);
if (this.chunk == null) opts = opts.chunkSize(DEFAULT_CHUNK_SIZE);
else opts = opts.chunkSize(this.chunk);
return opts;
}
/* (non-Javadoc)
* @see com.googlecode.objectify.Query#get()
*/
@Override
public T get() {
// The underlying datastore is basically doing this for PreparedQuery.asSingleEntity(),
// so let's do it ourselves and integrate offset()
FetchOptions opts = FetchOptions.Builder.withLimit(1);
if (this.offset > 0) opts = opts.offset(this.offset);
if (this.cursor != null) opts = opts.cursor(this.cursor);
Iterator<Entity> it = this.prepare().asIterator(opts);
if (it.hasNext()) {
Entity ent = it.next();
EntityMetadata<T> metadata = this.factory.getMetadata(ent.getKey());
return metadata.toObject(ent);
} else {
return null;
}
}
