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- /*
- * Copyright 2000-2016 Vaadin Ltd.
- *
- * 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 com.vaadin.client.metadata;
-
- import java.util.ArrayList;
- import java.util.Collections;
- import java.util.List;
-
- import com.vaadin.client.Profiler;
-
- public abstract class AsyncBundleLoader {
- public enum State {
- NOT_STARTED, LOADING, LOADED, ERROR;
- }
-
- private State state = State.NOT_STARTED;
-
- private Throwable error = null;
-
- private List<BundleLoadCallback> callbacks = new ArrayList<>();
-
- private final String packageName;
-
- private final String[] indentifiers;
-
- public AsyncBundleLoader(String packageName, String[] indentifiers) {
- this.packageName = packageName;
- this.indentifiers = indentifiers;
- }
-
- protected abstract void load(TypeDataStore store);
-
- public List<BundleLoadCallback> setError(Throwable error) {
- assert state == State.LOADING;
- state = State.ERROR;
- this.error = error;
-
- return clearCallbacks();
- }
-
- public Throwable getError() {
- return error;
- }
-
- public State getState() {
- return state;
- }
-
- public List<BundleLoadCallback> getCallback() {
- return Collections.unmodifiableList(callbacks);
- }
-
- public void load(BundleLoadCallback callback, TypeDataStore store) {
- assert state == State.NOT_STARTED;
- Profiler.enter("AsyncBundleLoader.load");
- state = State.LOADING;
- addCallback(callback);
- load(store);
- Profiler.leave("AsyncBundleLoader.load");
- }
-
- public void addCallback(BundleLoadCallback callback) {
- assert state == State.LOADING;
- if (callback != null) {
- callbacks.add(callback);
- }
- }
-
- public List<BundleLoadCallback> setLoaded() {
- assert state == State.LOADING;
- state = State.LOADED;
-
- return clearCallbacks();
- }
-
- private List<BundleLoadCallback> clearCallbacks() {
- List<BundleLoadCallback> callbacks = this.callbacks;
- this.callbacks = null;
- return callbacks;
- }
-
- public String getName() {
- return packageName;
- }
-
- public String[] getIndentifiers() {
- return indentifiers;
- }
-
- }
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