org.teamapps.databinding.ObservableSessionValue Maven / Gradle / Ivy
/*-
* ========================LICENSE_START=================================
* TeamApps
* ---
* Copyright (C) 2014 - 2023 TeamApps.org
* ---
* 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.
* =========================LICENSE_END==================================
*/
package org.teamapps.databinding;
import org.teamapps.event.Event;
import java.util.function.Consumer;
public class ObservableSessionValue {
private final Event onChanged = new Event<>();
private final Event onBeforeChanged = new Event<>();
private T value;
private final boolean notifyOnChangeOnly;
public ObservableSessionValue() {
this(true);
}
public ObservableSessionValue(boolean notifyOnChangeOnly) {
this.notifyOnChangeOnly = notifyOnChangeOnly;
}
public void set(T value) {
if (notifyOnChangeOnly) {
updateOnChange(value);
} else {
updateAlways(value);
}
}
private void updateAlways(T value) {
onBeforeChanged.fireIfChanged(value);
this.value = value;
onChanged.fireIfChanged(value);
}
private void updateOnChange(T value) {
onBeforeChanged.fire(value);
this.value = value;
onChanged.fire(value);
}
public T get() {
return value;
}
public void addOnChangeListener(Consumer listener) {
onChanged.addListener(listener);
}
public void removeOnChangeListener(Consumer listener) {
onChanged.removeListener(listener);
}
public void addOnBeforeChangeListener(Consumer listener) {
onBeforeChanged.addListener(listener);
}
public void removeBeforeOnChangeListener(Consumer listener) {
onBeforeChanged.removeListener(listener);
}
}