playn.core.util.Callbacks Maven / Gradle / Ivy
/**
* Copyright 2012 The PlayN Authors
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package playn.core.util;
import java.util.ArrayList;
import java.util.List;
/**
* {@link Callback}-related helper functions.
*/
public class Callbacks {
/**
* Adds {@code callback} to {@code list}, creating {@code list} if it is null, and returning (the
* possibly newly created) {@code list}.
*/
public static List> createAdd(
List> list, Callback callback) {
if (list == null)
list = new ArrayList>();
list.add(callback);
return list;
}
/**
* Dispatches {@link Callback#onSuccess} to all callbacks in {@code list} using {@code result}.
* If {@code list} is null, does nothing. Returns {@code null} to support standard usage pattern.
*/
public static List> dispatchSuccessClear(
List> list, T result) {
if (list != null) {
for (int ii = 0, ll = list.size(); ii < ll; ii++)
list.get(ii).onSuccess(result);
}
return null;
}
/**
* Dispatches {@link Callback#onSuccess} to all callbacks in {@code list} using {@code result}.
* If {@code list} is null, does nothing. Returns {@code null} to support standard usage pattern.
*/
public static List> dispatchFailureClear(
List> list, Throwable cause) {
if (list != null) {
for (int ii = 0, ll = list.size(); ii < ll; ii++)
list.get(ii).onFailure(cause);
}
return null;
}
}