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/*
* _____________________________________________________________________________
*
* INAF - OATS National Institute for Astrophysics - Astronomical Observatory of
* Trieste INAF - IA2 Italian Center for Astronomical Archives
* _____________________________________________________________________________
*
* Copyright (C) 2016 Istituto Nazionale di Astrofisica
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License Version 3 as published by the
* Free Software Foundation.
*
* This program 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 for more
* details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 51
* Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
Sonia Zorba
committed
package it.inaf.ia2.tsm.api;
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import java.io.Serializable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represent an {@code EntityProperty} which value can be modified by the user.
*
* @author Sonia Zorba {@literal <zorba at oats.inaf.it>}
*/
public class EditableProperty<T> implements EntityProperty, Serializable {
private static final long serialVersionUID = 4896192667771442640L;
private static final Logger log = LoggerFactory.getLogger(EditableProperty.class);
private final T defaultValue;
private final boolean allowsNull;
private T originalValue;
private T value;
public EditableProperty() {
this.defaultValue = null;
this.allowsNull = true;
this.init(defaultValue);
}
public EditableProperty(T defaultValue, boolean allowsNull) {
this.defaultValue = defaultValue;
this.allowsNull = allowsNull;
this.init(defaultValue);
}
@Override
public <X> X getValue(Class<X> type) {
return (X) value;
}
public <X> X getOriginalValue(Class<X> type) {
return (X) originalValue;
}
public <X> void setValue(X value) {
if (value == null && !allowsNull) {
throw new IllegalArgumentException("This EditableProperty instance doesn't allow null values");
}
this.value = (T) value;
}
public boolean isChanged() {
if (originalValue == null) {
return value != null;
}
return !originalValue.equals(value);
}
@Override
public final <X> void init(X initialValue) {
setValue(initialValue);
this.originalValue = (T) initialValue;
}
public void save() {
this.originalValue = value;
}
}