/
ElementListenerMap.java
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/
ElementListenerMap.java
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/*
* Copyright 2000-2018 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.flow.internal.nodefeature;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.function.Function;
import java.util.stream.Stream;
import com.vaadin.flow.dom.DebouncePhase;
import com.vaadin.flow.dom.DisabledUpdateMode;
import com.vaadin.flow.dom.DomEvent;
import com.vaadin.flow.dom.DomEventListener;
import com.vaadin.flow.dom.DomListenerRegistration;
import com.vaadin.flow.function.SerializableRunnable;
import com.vaadin.flow.internal.ConstantPoolKey;
import com.vaadin.flow.internal.JsonUtils;
import com.vaadin.flow.internal.StateNode;
import com.vaadin.flow.shared.JsonConstants;
import elemental.json.Json;
import elemental.json.JsonObject;
import elemental.json.JsonValue;
/**
* Map of DOM events with server-side listeners. The key set of this map
* describes the event types for which listeners are present. The values
* associated with the keys are currently not used.
*
* @author Vaadin Ltd
* @since 1.0
*/
public class ElementListenerMap extends NodeMap {
/**
* Dummy filter string that always passes.
*/
public static final String ALWAYS_TRUE_FILTER = "1";
private static final EnumSet<DebouncePhase> NO_TIMEOUT_PHASES
= EnumSet.of(DebouncePhase.LEADING);
// Server-side only data
private Map<String, List<DomEventListenerWrapper>> listeners;
private static class ExpressionSettings implements Serializable {
private Map<Integer, Set<DebouncePhase>> debounceSettings = new HashMap<>();
public void addDebouncePhases(int timeout, Set<DebouncePhase> phases) {
debounceSettings.merge(Integer.valueOf(timeout), phases,
(phases1, phases2) -> {
EnumSet<DebouncePhase> merge = EnumSet.copyOf(phases1);
merge.addAll(phases2);
return merge;
});
}
public JsonValue toJson() {
if (debounceSettings.isEmpty()) {
return Json.create(false);
} else if (debounceSettings.size() == 1
&& debounceSettings.containsKey(Integer.valueOf(0))) {
// Shorthand if only debounce is a dummy filter debounce
return Json.create(true);
} else {
// [[timeout1, phase1, phase2, ...], [timeout2, phase1, ...]]
return debounceSettings.entrySet().stream()
.map(entry -> Stream
.concat(Stream.of(
Json.create(entry.getKey().intValue())),
entry.getValue().stream()
.map(DebouncePhase::getIdentifier)
.map(Json::create))
.collect(JsonUtils.asArray()))
.collect(JsonUtils.asArray());
}
}
}
private static class DomEventListenerWrapper
implements DomListenerRegistration {
private final String type;
private final DomEventListener origin;
private final ElementListenerMap listenerMap;
private DisabledUpdateMode mode = DisabledUpdateMode.ONLY_WHEN_ENABLED;
private Set<String> eventDataExpressions;
private String filter;
private int debounceTimeout = 0;
private EnumSet<DebouncePhase> debouncePhases = NO_TIMEOUT_PHASES;
private List<SerializableRunnable> unregisterHandlers;
private DomEventListenerWrapper(ElementListenerMap listenerMap,
String type, DomEventListener origin) {
this.listenerMap = listenerMap;
this.type = type;
this.origin = origin;
}
@Override
public String getEventType() {
return type;
}
@Override
public void remove() {
if (unregisterHandlers != null) {
unregisterHandlers.forEach(SerializableRunnable::run);
}
listenerMap.removeListener(type, this);
// update settings after removal. If we have listeners of the
// same type registered, we want to remove settings set by this
// particular listener from the overall set
// fixes #5090
if (listenerMap.listeners != null
&& listenerMap.listeners.containsKey(type)) {
listenerMap.updateEventSettings(type);
}
}
@Override
public DomListenerRegistration addEventData(String eventData) {
if (eventData == null) {
throw new IllegalArgumentException(
"The event data expression must not be null");
}
if (eventDataExpressions == null) {
eventDataExpressions = Collections.singleton(eventData);
} else {
if (eventDataExpressions.size() == 1) {
Set<String> oldExpressions = eventDataExpressions;
// Don't use no-args or Collection constructors that
// allocate for 16 entries
eventDataExpressions = new HashSet<>(4);
eventDataExpressions.addAll(oldExpressions);
}
eventDataExpressions.add(eventData);
}
listenerMap.updateEventSettings(type);
return this;
}
@Override
public DomListenerRegistration setDisabledUpdateMode(
DisabledUpdateMode disabledUpdateMode) {
if (disabledUpdateMode == null) {
throw new IllegalArgumentException(
"RPC comunication control mode for disabled element must not be null");
}
mode = disabledUpdateMode;
return this;
}
@Override
public DomListenerRegistration setFilter(String filter) {
this.filter = filter;
listenerMap.updateEventSettings(type);
return this;
}
@Override
public String getFilter() {
return filter;
}
boolean matchesFilter(JsonObject eventData) {
if (filter == null) {
// No filter: always matches
return true;
}
if (eventData == null) {
// No event data: cannot match the filter
return false;
}
return eventData.getBoolean(filter);
}
@Override
public DomListenerRegistration debounce(int timeout,
DebouncePhase firstPhase, DebouncePhase... additionalPhases) {
if (timeout < 0) {
throw new IllegalArgumentException(
"Timeout cannot be negative");
}
debounceTimeout = timeout;
if (timeout == 0) {
debouncePhases = NO_TIMEOUT_PHASES;
} else {
debouncePhases = EnumSet.of(firstPhase, additionalPhases);
}
listenerMap.updateEventSettings(type);
return this;
}
@Override
public int getDebounceTimeout() {
return debounceTimeout;
}
@Override
public Set<DebouncePhase> getDebouncePhases() {
return Collections.unmodifiableSet(debouncePhases);
}
public boolean matchesPhase(DebouncePhase phase) {
return debouncePhases.contains(phase);
}
@Override
public DomListenerRegistration onUnregister(
SerializableRunnable unregisterHandler) {
if (unregisterHandlers == null) {
unregisterHandlers = new ArrayList<>(1);
}
unregisterHandlers.add(Objects.requireNonNull(unregisterHandler,
"Unregister handler cannot be null"));
return this;
}
private boolean isPropertySynchronized(String propertyName) {
return eventDataExpressions != null && eventDataExpressions
.contains(JsonConstants.SYNCHRONIZE_PROPERTY_TOKEN
+ propertyName);
}
}
/**
* Creates a new element listener map for the given node.
*
* @param node
* the node that the map belongs to
*
*/
public ElementListenerMap(StateNode node) {
super(node);
}
/**
* Add eventData for an event type.
*
* @param eventType
* the event type
* @param listener
* the listener to add
* @return a handle for configuring and removing the listener
*/
public DomListenerRegistration add(String eventType,
DomEventListener listener) {
assert eventType != null;
assert listener != null;
if (!contains(eventType)) {
assert listeners == null || !listeners.containsKey(eventType);
ArrayList<DomEventListenerWrapper> listenerList = new ArrayList<>(
1);
if (listeners == null) {
listeners = Collections.singletonMap(eventType, listenerList);
} else {
if (listeners.size() == 1 && !(listeners instanceof HashMap)) {
listeners = new HashMap<>(listeners);
}
listeners.put(eventType, listenerList);
}
}
DomEventListenerWrapper listenerWrapper = new DomEventListenerWrapper(
this, eventType, listener);
listeners.get(eventType).add(listenerWrapper);
updateEventSettings(eventType);
return listenerWrapper;
}
private Collection<DomEventListenerWrapper> getWrappers(String eventType) {
if (listeners == null) {
return Collections.emptyList();
}
List<DomEventListenerWrapper> typeListeners = listeners.get(eventType);
if (typeListeners == null) {
return Collections.emptyList();
}
return typeListeners;
}
private Map<String, ExpressionSettings> collectEventExpressions(
String eventType) {
Map<String, ExpressionSettings> expressions = new HashMap<>();
boolean hasUnfilteredListener = false;
boolean hasFilteredListener = false;
Function<String, ExpressionSettings> ensureExpression = expression -> expressions
.computeIfAbsent(expression, (key -> new ExpressionSettings()));
Collection<DomEventListenerWrapper> wrappers = getWrappers(eventType);
for (DomEventListenerWrapper wrapper : wrappers) {
if (wrapper.eventDataExpressions != null) {
wrapper.eventDataExpressions.forEach(ensureExpression::apply);
}
String filter = wrapper.getFilter();
int timeout = wrapper.debounceTimeout;
if (timeout > 0 && filter == null) {
filter = ALWAYS_TRUE_FILTER;
}
if (filter == null) {
hasUnfilteredListener = true;
} else {
hasFilteredListener = true;
ensureExpression.apply(filter).addDebouncePhases(timeout,
wrapper.debouncePhases);
}
}
if (hasFilteredListener && hasUnfilteredListener) {
/*
* If there are filters and none match, then client won't send
* anything to the server.
*
* Include a filter that always passes to ensure that unfiltered
* listeners are still notified.
*/
ensureExpression.apply(ALWAYS_TRUE_FILTER).addDebouncePhases(0,
NO_TIMEOUT_PHASES);
}
return expressions;
}
private void updateEventSettings(String eventType) {
Map<String, ExpressionSettings> eventSettings = collectEventExpressions(
eventType);
JsonObject eventSettingsJson = JsonUtils.createObject(eventSettings,
ExpressionSettings::toJson);
ConstantPoolKey constantPoolKey = new ConstantPoolKey(
eventSettingsJson);
put(eventType, constantPoolKey);
}
private void removeListener(String eventType,
DomEventListenerWrapper wrapper) {
if (listeners == null) {
return;
}
Collection<DomEventListenerWrapper> listenerList = listeners
.get(eventType);
if (listenerList != null) {
listenerList.remove(wrapper);
// No more listeners of this type?
if (listenerList.isEmpty()) {
if (listeners.size() == 1) {
assert listeners.containsKey(eventType);
listeners = null;
} else {
listeners.remove(eventType);
}
// Remove from the set that is synchronized with the client
remove(eventType);
}
}
}
/**
* Fires an event to all listeners registered for the given type.
*
* @param event
* the event to fire
*/
public void fireEvent(DomEvent event) {
if (listeners == null) {
return;
}
boolean isElementEnabled = event.getSource().isEnabled();
List<DomEventListenerWrapper> typeListeners = listeners
.get(event.getType());
if (typeListeners == null) {
return;
}
List<DomEventListener> listeners = new ArrayList<>();
for (DomEventListenerWrapper wrapper : typeListeners) {
if ((isElementEnabled
|| DisabledUpdateMode.ALWAYS.equals(wrapper.mode))
&& wrapper.matchesFilter(event.getEventData())
&& wrapper.matchesPhase(event.getPhase())) {
listeners.add(wrapper.origin);
}
}
listeners.forEach(listener -> listener.handleEvent(event));
}
/**
* Gets the event data expressions defined for the given event name. This
* method is currently only provided to facilitate unit testing.
*
* @param name
* the name of the event, not <code>null</code>
* @return an unmodifiable set of event data expressions, not
* <code>null</code>
*/
Set<String> getExpressions(String name) {
assert name != null;
return collectEventExpressions(name).keySet();
}
/**
* Gets the most permissive update mode for any event registration that is
* configured to synchronize the given property.
*
* @param propertyName
* the property name to check, not <code>null</code>
* @return the most permissive update mode, or <code>null</code> if
* synchronization is not configured for the given property
*/
public DisabledUpdateMode getPropertySynchronizationMode(
String propertyName) {
assert propertyName != null;
if (listeners == null) {
return null;
}
return listeners.values().stream().flatMap(List::stream)
.filter(wrapper -> wrapper.isPropertySynchronized(propertyName))
.map(wrapper -> wrapper.mode)
.reduce(DisabledUpdateMode::mostPermissive).orElse(null);
}
}