nextapp.echo.app.DerivedMutableStyle 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;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
/**
* A MutableStyle which will retrieve properties from a
* "parent" style when they are not set locally.
*/
public class DerivedMutableStyle extends MutableStyle {
/** Serial Version UID. */
private static final long serialVersionUID = 20070101L;
private Style parentStyle;
/**
* Default constructor.
*/
public DerivedMutableStyle() {
super();
}
/**
* Creates a new DerivedMutableStyle.
*
* @param parentStyle the style from which to retrieve properties
* when they are not set within this style
*/
public DerivedMutableStyle(Style parentStyle) {
this.parentStyle = parentStyle;
}
/**
* Returns the parent style.
*
* @return the parent style
*/
public Style getParentStyle() {
return parentStyle;
}
/**
* @see nextapp.echo.app.Style#getIndex(java.lang.String, int)
*/
public Object getIndex(String propertyName, int propertyIndex) {
if (super.isIndexedPropertySet(propertyName, propertyIndex)) {
return super.getIndex(propertyName, propertyIndex);
} else if (parentStyle != null) {
return parentStyle.getIndex(propertyName, propertyIndex);
} else {
return null;
}
}
/**
* @see nextapp.echo.app.Style#get(java.lang.String)
*/
public Object get(String propertyName) {
if (super.isPropertySet(propertyName)) {
return super.get(propertyName);
} else if (parentStyle != null) {
return parentStyle.get(propertyName);
} else {
return null;
}
}
/**
* @see nextapp.echo.app.Style#getPropertyNames()
*/
public Iterator getPropertyNames() {
Iterator it = super.getPropertyNames();
Set propertyNames = new HashSet();
while (it.hasNext()) {
propertyNames.add(it.next());
}
if (parentStyle != null) {
it = parentStyle.getPropertyNames();
while (it.hasNext()) {
propertyNames.add(it.next());
}
}
return propertyNames.iterator();
}
/**
* @see nextapp.echo.app.Style#isIndexedPropertySet(java.lang.String, int)
*/
public boolean isIndexedPropertySet(String propertyName, int propertyIndex) {
return super.isIndexedPropertySet(propertyName, propertyIndex)
|| (parentStyle != null && parentStyle.isIndexedPropertySet(propertyName, propertyIndex));
}
/**
* @see nextapp.echo.app.Style#isPropertySet(java.lang.String)
*/
public boolean isPropertySet(String propertyName) {
return super.isPropertySet(propertyName) || (parentStyle != null && parentStyle.isPropertySet(propertyName));
}
/**
* Sets the parent style, from which properties will be retrieved if they
* are not found in this style.
*
* @param parentStyle the parent style
*/
public void setParentStyle(Style parentStyle) {
this.parentStyle = parentStyle;
}
}