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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.server.communication;
-
- import java.io.IOException;
- import java.io.Serializable;
- import java.io.Writer;
- import java.util.ArrayList;
- import java.util.Collection;
- import java.util.Collections;
- import java.util.List;
- import java.util.logging.Logger;
-
- import com.vaadin.server.ClientConnector;
- import com.vaadin.server.LegacyPaint;
- import com.vaadin.server.PaintTarget;
- import com.vaadin.ui.Component;
- import com.vaadin.ui.LegacyComponent;
- import com.vaadin.ui.UI;
-
- /**
- * Serializes legacy UIDL changes to JSON.
- *
- * @author Vaadin Ltd
- * @since 7.1
- */
- public class LegacyUidlWriter implements Serializable {
-
- /**
- * Writes a JSON array containing the changes of all dirty
- * {@link LegacyComponent}s in the given UI.
- *
- * @param ui
- * The {@link UI} whose legacy changes to write
- * @param writer
- * The {@link Writer} to write the JSON with
- * @param target
- * The {@link PaintTarget} to use
- * @throws IOException
- * If the serialization fails.
- */
- public void write(UI ui, Writer writer, PaintTarget target)
- throws IOException {
-
- Collection<ClientConnector> dirtyVisibleConnectors = ui
- .getConnectorTracker().getDirtyVisibleConnectors();
-
- List<Component> legacyComponents = new ArrayList<>(
- dirtyVisibleConnectors.size());
- for (ClientConnector connector : dirtyVisibleConnectors) {
- // All Components that want to use paintContent must implement
- // LegacyComponent
- if (connector instanceof LegacyComponent) {
- legacyComponents.add((Component) connector);
- }
- }
- sortByHierarchy(legacyComponents);
-
- writer.write("[");
- for (Component c : legacyComponents) {
- getLogger()
- .fine("Painting LegacyComponent " + c.getClass().getName()
- + "@" + Integer.toHexString(c.hashCode()));
- target.startTag("change");
- final String pid = c.getConnectorId();
- target.addAttribute("pid", pid);
- LegacyPaint.paint(c, target);
- target.endTag("change");
- }
- writer.write("]");
- }
-
- private void sortByHierarchy(List<Component> paintables) {
- // Vaadin 6 requires parents to be painted before children as component
- // containers rely on that their updateFromUIDL method has been called
- // before children start calling e.g. updateCaption
- Collections.sort(paintables, (Component c1, Component c2) -> {
- int depth1 = 0;
- while (c1.getParent() != null) {
- depth1++;
- c1 = c1.getParent();
- }
- int depth2 = 0;
- while (c2.getParent() != null) {
- depth2++;
- c2 = c2.getParent();
- }
- if (depth1 < depth2) {
- return -1;
- }
- if (depth1 > depth2) {
- return 1;
- }
- return 0;
- });
- }
-
- private static final Logger getLogger() {
- return Logger.getLogger(LegacyUidlWriter.class.getName());
- }
- }
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