nextapp.echo.app.serial.property.IntegerPeer Maven / Gradle / Ivy
/*
* This file is part of the Echo Web Application Framework (hereinafter "Echo").
* Copyright (C) 2002-2009 NextApp, Inc.
*
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*/
package nextapp.echo.app.serial.property;
import nextapp.echo.app.reflect.IntrospectorFactory;
import nextapp.echo.app.reflect.ObjectIntrospector;
import nextapp.echo.app.serial.SerialContext;
import nextapp.echo.app.serial.SerialException;
import nextapp.echo.app.serial.SerialPropertyPeer;
import nextapp.echo.app.util.Context;
import nextapp.echo.app.util.DomUtil;
import org.w3c.dom.Element;
/**
* SerialPropertyPeer for Integer properties.
*/
public class IntegerPeer
implements SerialPropertyPeer {
/**
* Uses an ObjectIntrospector to determine the integer value of
* a constant name
*
* @param context the relevant SerialContext
* @param objectClass the Class of object containing candidate
* constant values
* @param value the name of the constant value
* @return an integer representing the constant value, or null if the
* constant is not found
*/
private Integer introspectConstantValue(Context context, Class objectClass, String value)
throws SerialException {
SerialContext serialContext = (SerialContext) context.get(SerialContext.class);
try {
ObjectIntrospector introspector = IntrospectorFactory.get(objectClass.getName(),
serialContext.getClassLoader());
if (value.startsWith(objectClass.getName())) {
// Remove class name if required.
value = value.substring(objectClass.getName().length() + 1);
}
Object constantValue = introspector.getConstantValue(value);
if (constantValue instanceof Integer) {
return (Integer) constantValue;
} else {
return null;
}
} catch (ClassNotFoundException ex) {
// Should not occur.
throw new SerialException("Object class not found.", ex);
}
}
/**
* @see nextapp.echo.app.serial.SerialPropertyPeer#toProperty(nextapp.echo.app.util.Context,
* java.lang.Class, org.w3c.dom.Element)
*/
public Object toProperty(Context context, Class objectClass, Element propertyElement)
throws SerialException {
String valueText = propertyElement.hasAttribute("v")
? propertyElement.getAttribute("v") : DomUtil.getElementText(propertyElement);
try {
return new Integer(valueText);
} catch (NumberFormatException ex) {
return introspectConstantValue(context, objectClass, valueText);
}
}
/**
* @see nextapp.echo.app.serial.SerialPropertyPeer#toXml(nextapp.echo.app.util.Context,
* java.lang.Class, org.w3c.dom.Element, java.lang.Object)
*/
public void toXml(Context context, Class objectClass, Element propertyElement, Object propertyValue)
throws SerialException {
SerialContext serialContext = (SerialContext) context.get(SerialContext.class);
propertyElement.setAttribute("t", "i");
propertyElement.appendChild(serialContext.getDocument().createTextNode(propertyValue.toString()));
}
}