nextapp.echo.app.reflect.ComponentIntrospector 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.reflect;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
/**
* Extends ObjectIntrospector to provide
* nextapp.echo.app.Component-specific functionality,
* i.e., introspection of style constants names.
*/
public class ComponentIntrospector extends ObjectIntrospector {
/**
* A mapping between the component's property names and their
* style constants.
*/
private Map styleConstantNames = new HashMap();
/**
* Creates a new ComponentIntrospector for the specified
* type.
*
* @param typeName the component type name
*/
protected ComponentIntrospector(String typeName, ClassLoader classLoader)
throws ClassNotFoundException {
super(typeName, classLoader);
loadStyleConstantData();
}
/**
* Returns the name of the style constant for the given
* property name.
*
* @param propertyName The name of the property.
* @return the style constant name, or null if no style constant
* exists
*/
public String getStyleConstantName(String propertyName) {
return (String) styleConstantNames.get(propertyName);
}
/**
* Initialization method to load data related to style constants.
*/
private void loadStyleConstantData() {
Field[] fields = getObjectClass().getFields();
for (int index = 0; index < fields.length; ++index) {
if (fields[index].getType() == String.class
&& (fields[index].getModifiers() & PUBLIC_CONSTANT_MODIFERS) != 0
&& fields[index].getName().startsWith("PROPERTY_")) {
String styleConstant = fields[index].getName();
try {
String propertyName = (String) fields[index].get(null);
styleConstantNames.put(propertyName, styleConstant);
} catch (IllegalAccessException ex) {
// Should not occur.
}
}
}
}
}