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/*
* Copyright (c) 2010, 2019, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package com.sun.javafx.event;
import javafx.event.Event;
import javafx.event.EventHandler;
import javafx.event.WeakEventHandler;
public final class CompositeEventHandler {
private EventProcessorRecord firstRecord;
private EventProcessorRecord lastRecord;
private EventHandler eventHandler;
public void setEventHandler(final EventHandler eventHandler) {
this.eventHandler = eventHandler;
}
public EventHandler getEventHandler() {
return eventHandler;
}
public void addEventHandler(final EventHandler eventHandler) {
if (find(eventHandler, false) == null) {
append(lastRecord, createEventHandlerRecord(eventHandler));
}
}
public void removeEventHandler(final EventHandler eventHandler) {
final EventProcessorRecord record = find(eventHandler, false);
if (record != null) {
remove(record);
}
}
public void addEventFilter(final EventHandler eventFilter) {
if (find(eventFilter, true) == null) {
append(lastRecord, createEventFilterRecord(eventFilter));
}
}
public void removeEventFilter(final EventHandler eventFilter) {
final EventProcessorRecord record = find(eventFilter, true);
if (record != null) {
remove(record);
}
}
public void dispatchBubblingEvent(final Event event) {
final T specificEvent = (T) event;
EventProcessorRecord record = firstRecord;
while (record != null) {
if (record.isDisconnected()) {
remove(record);
} else {
record.handleBubblingEvent(specificEvent);
}
record = record.nextRecord;
}
if (eventHandler != null) {
eventHandler.handle(specificEvent);
}
}
public void dispatchCapturingEvent(final Event event) {
final T specificEvent = (T) event;
EventProcessorRecord record = firstRecord;
while (record != null) {
if (record.isDisconnected()) {
remove(record);
} else {
record.handleCapturingEvent(specificEvent);
}
record = record.nextRecord;
}
}
public boolean hasFilter() {
return find(true);
}
public boolean hasHandler() {
if (getEventHandler() != null) return true;
return find(false);
}
/* Used for testing. */
boolean containsHandler(final EventHandler eventHandler) {
return find(eventHandler, false) != null;
}
/* Used for testing. */
boolean containsFilter(final EventHandler eventFilter) {
return find(eventFilter, true) != null;
}
private EventProcessorRecord createEventHandlerRecord(
final EventHandler eventHandler) {
return (eventHandler instanceof WeakEventHandler)
? new WeakEventHandlerRecord(
(WeakEventHandler) eventHandler)
: new NormalEventHandlerRecord(eventHandler);
}
private EventProcessorRecord createEventFilterRecord(
final EventHandler eventFilter) {
return (eventFilter instanceof WeakEventHandler)
? new WeakEventFilterRecord(
(WeakEventHandler) eventFilter)
: new NormalEventFilterRecord(eventFilter);
}
private void remove(final EventProcessorRecord record) {
final EventProcessorRecord prevRecord = record.prevRecord;
final EventProcessorRecord nextRecord = record.nextRecord;
if (prevRecord != null) {
prevRecord.nextRecord = nextRecord;
} else {
firstRecord = nextRecord;
}
if (nextRecord != null) {
nextRecord.prevRecord = prevRecord;
} else {
lastRecord = prevRecord;
}
// leave record.nextRecord set
}
private void append(final EventProcessorRecord prevRecord,
final EventProcessorRecord newRecord) {
EventProcessorRecord nextRecord;
if (prevRecord != null) {
nextRecord = prevRecord.nextRecord;
prevRecord.nextRecord = newRecord;
} else {
nextRecord = firstRecord;
firstRecord = newRecord;
}
if (nextRecord != null) {
nextRecord.prevRecord = newRecord;
} else {
lastRecord = newRecord;
}
newRecord.prevRecord = prevRecord;
newRecord.nextRecord = nextRecord;
}
private EventProcessorRecord find(
final EventHandler eventProcessor,
final boolean isFilter) {
EventProcessorRecord record = firstRecord;
while (record != null) {
if (record.isDisconnected()) {
remove(record);
} else if (record.stores(eventProcessor, isFilter)) {
return record;
}
record = record.nextRecord;
}
return null;
}
private boolean find(boolean isFilter) {
EventProcessorRecord record = firstRecord;
while (record != null) {
if (record.isDisconnected()) {
remove(record);
} else if (isFilter == record.isFilter()) {
return true;
}
record = record.nextRecord;
}
return false;
}
private static abstract class EventProcessorRecord {
private EventProcessorRecord nextRecord;
private EventProcessorRecord prevRecord;
public abstract boolean stores(EventHandler eventProcessor,
boolean isFilter);
public abstract boolean isFilter();
public abstract void handleBubblingEvent(T event);
public abstract void handleCapturingEvent(T event);
public abstract boolean isDisconnected();
}
private static final class NormalEventHandlerRecord
extends EventProcessorRecord {
private final EventHandler eventHandler;
public NormalEventHandlerRecord(
final EventHandler eventHandler) {
this.eventHandler = eventHandler;
}
@Override
public boolean stores(final EventHandler eventProcessor,
final boolean isFilter) {
return isFilter == isFilter() && (this.eventHandler == eventProcessor);
}
@Override
public boolean isFilter() {
return false;
}
@Override
public void handleBubblingEvent(final T event) {
eventHandler.handle(event);
}
@Override
public void handleCapturingEvent(final T event) {
}
@Override
public boolean isDisconnected() {
return false;
}
}
private static final class WeakEventHandlerRecord
extends EventProcessorRecord {
private final WeakEventHandler weakEventHandler;
public WeakEventHandlerRecord(
final WeakEventHandler weakEventHandler) {
this.weakEventHandler = weakEventHandler;
}
@Override
public boolean stores(final EventHandler eventProcessor,
final boolean isFilter) {
return isFilter == isFilter() && (weakEventHandler == eventProcessor);
}
@Override
public boolean isFilter() {
return false;
}
@Override
public void handleBubblingEvent(final T event) {
weakEventHandler.handle(event);
}
@Override
public void handleCapturingEvent(final T event) {
}
@Override
public boolean isDisconnected() {
return weakEventHandler.wasGarbageCollected();
}
}
private static final class NormalEventFilterRecord
extends EventProcessorRecord {
private final EventHandler eventFilter;
public NormalEventFilterRecord(
final EventHandler eventFilter) {
this.eventFilter = eventFilter;
}
@Override
public boolean stores(final EventHandler eventProcessor,
final boolean isFilter) {
return isFilter == isFilter() && (this.eventFilter == eventProcessor);
}
@Override
public boolean isFilter() {
return true;
}
@Override
public void handleBubblingEvent(final T event) {
}
@Override
public void handleCapturingEvent(final T event) {
eventFilter.handle(event);
}
@Override
public boolean isDisconnected() {
return false;
}
}
private static final class WeakEventFilterRecord
extends EventProcessorRecord {
private final WeakEventHandler weakEventFilter;
public WeakEventFilterRecord(
final WeakEventHandler weakEventFilter) {
this.weakEventFilter = weakEventFilter;
}
@Override
public boolean stores(final EventHandler eventProcessor,
final boolean isFilter) {
return isFilter == isFilter() && (weakEventFilter == eventProcessor);
}
@Override
public boolean isFilter() {
return true;
}
@Override
public void handleBubblingEvent(final T event) {
}
@Override
public void handleCapturingEvent(final T event) {
weakEventFilter.handle(event);
}
@Override
public boolean isDisconnected() {
return weakEventFilter.wasGarbageCollected();
}
}
}
