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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.ui.dd;
-
- import java.util.HashSet;
-
- import com.vaadin.client.UIDL;
-
- /**
- *
- */
- public class VLazyInitItemIdentifiers extends VAcceptCriterion {
- private boolean loaded = false;
- private HashSet<String> hashSet;
- private VDragEvent lastDragEvent;
-
- @Override
- public void accept(final VDragEvent drag, UIDL configuration,
- final VAcceptCallback callback) {
- if (lastDragEvent == null || lastDragEvent != drag) {
- loaded = false;
- lastDragEvent = drag;
- }
- if (loaded) {
- Object object = drag.getDropDetails().get("itemIdOver");
- if (hashSet.contains(object)) {
- callback.accepted(drag);
- }
- } else {
-
- VDragEventServerCallback acceptCallback = new VDragEventServerCallback() {
-
- @Override
- public void handleResponse(boolean accepted, UIDL response) {
- hashSet = new HashSet<>();
- String[] stringArrayAttribute = response
- .getStringArrayAttribute("allowedIds");
- for (int i = 0; i < stringArrayAttribute.length; i++) {
- hashSet.add(stringArrayAttribute[i]);
- }
- loaded = true;
- if (accepted) {
- callback.accepted(drag);
- }
- }
- };
-
- VDragAndDropManager.get().visitServer(acceptCallback);
- }
-
- }
-
- @Override
- public boolean needsServerSideCheck(VDragEvent drag, UIDL criterioUIDL) {
- return loaded;
- }
-
- @Override
- protected boolean accept(VDragEvent drag, UIDL configuration) {
- return false; // not used is this implementation
- }
- }
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