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/*
* Copyright (c) 2012, Codename One 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. Codename One 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 Codename One through http://www.codenameone.com/ if you
* need additional information or have any questions.
*/
package com.codename1.properties;
import com.codename1.io.Preferences;
/**
* Binds an object to the {@link com.codename1.io.Preferences} API for automatic persistent storage.
* You can use this API like the builder pattern by using the create method and chaining it with setters until
* bind is invoked.
*
* @author Shai Almog
*/
public class PreferencesObject {
private PropertyBusinessObject bo;
private String prefix;
private boolean bound;
private PreferencesObject() {}
/**
* Creates a binding object, this method doesn't do anything until bind is invoked
* @param bo the business object this binding relates to
* @return the object controlling the binding
*/
public static PreferencesObject create(PropertyBusinessObject bo) {
PreferencesObject po = new PreferencesObject();
po.bo = bo;
po.prefix = bo.getPropertyIndex().getName() + ".";
return po;
}
/**
* Binds the object so it's seamlessly stored in preferences
* @return this to enable builder pattern binding
*/
public PreferencesObject bind() {
for(PropertyBase pb : bo.getPropertyIndex()) {
String name = (String)pb.getClientProperty("cn1-po-name");
if(name == null) {
name = pb.getName();
}
Class type = pb.getGenericType();
String n = prefix + name;
if(type == String.class || type == null) {
((Property)pb).set(Preferences.getAndSet(n, (String)((Property)pb).get()));
bindChangeListener((Property)pb, n, type);
continue;
}
Object obj = ((Property)pb).get();
if(type == Boolean.class) {
((Property)pb).set(Preferences.getAndSet(n, obj == null ? false : (Boolean)obj));
bindChangeListener((Property)pb, n, type);
continue;
}
if(type == Double.class) {
((Property)pb).set(Preferences.getAndSet(n, obj == null ? 0.0 : (Double)obj));
bindChangeListener((Property)pb, n, type);
continue;
}
if(type == Float.class) {
((Property)pb).set(Preferences.getAndSet(n, obj == null ? 0.0f : (Float)obj));
bindChangeListener((Property)pb, n, type);
continue;
}
if(type == Integer.class) {
((Property)pb).set(Preferences.getAndSet(n, obj == null ? 0 : (Integer)obj));
bindChangeListener((Property)pb, n, type);
continue;
}
if(type == Long.class) {
((Property)pb).set(Preferences.getAndSet(n, obj == null ? (long)0 : (Long)obj));
bindChangeListener((Property)pb, n, type);
continue;
}
throw new IllegalStateException("Unsupported property type in preferences: " + type.getName());
}
bound = true;
return this;
}
private void bindChangeListener(final Property pb, final String n, final Class type) {
pb.addChangeListener(new PropertyChangeListener() {
public void propertyChanged(PropertyBase p) {
if(type == String.class || type == null) {
Preferences.set(n, (String)((Property)pb).get());
return;
}
if(type == Boolean.class) {
Preferences.set(n, (Boolean)((Property)pb).get());
return;
}
if(type == Double.class) {
Preferences.set(n, (Double)((Property)pb).get());
return;
}
if(type == Float.class) {
Preferences.set(n, (Float)((Property)pb).get());
return;
}
if(type == Integer.class) {
Preferences.set(n, (Integer)((Property)pb).get());
return;
}
if(type == Long.class) {
Preferences.set(n, (Long)((Property)pb).get());
}
}
});
}
private void checkBind() {
if(bound) {
throw new IllegalStateException("Method can't be invoked after binding");
}
}
/**
* Sets the prefix for the binding, by default the object name with a "." is the common prefix
* @param prefix a string that will prefix the name
* @return this to enable builder pattern binding
*/
public PreferencesObject setPrefix(String prefix) {
checkBind();
// intern is used to trigger a null pointer exception if null is used
this.prefix = prefix.intern();
return this;
}
/**
* Sets the name of the specific field not including the prefix, by default the property name is used
* @param pb the property
* @param name the name for the property
* @return this to enable builder pattern binding
*/
public PreferencesObject setName(PropertyBase pb, String name) {
checkBind();
// intern is used to trigger a null pointer exception if null is used
pb.putClientProperty("cn1-po-name", name);
return this;
}
}
