nextapp.echo.app.MutableStyleSheet 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.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* A mutable implementation of a StyleSheet.
*/
public class MutableStyleSheet
implements StyleSheet {
/** Serial Version UID. */
private static final long serialVersionUID = 20070101L;
private Map namedStyleMap = new HashMap();
private Map defaultStyleMap = new HashMap();
/**
* Adds a Style to the StyleSheet.
*
* @param componentClass the Class of the
* Component for which the style is to be used
* @param styleName the name of the style
* @param style the Style to be added
*/
public void addStyle(Class componentClass, String styleName, Style style) {
if (styleName == null) {
defaultStyleMap.put(componentClass, style);
} else {
Map styleMap = (Map) namedStyleMap.get(styleName);
if (styleMap == null) {
styleMap = new HashMap();
namedStyleMap.put(styleName, styleMap);
}
styleMap.put(componentClass, style);
}
}
/**
* Adds the contents of another StyleSheet to this
* StyleSheet. Future changes to the added
* StyleSheet will not be reflected, unless it is re-added.
*
* @param styleSheet the StyleSheet to add
*/
public void addStyleSheet(MutableStyleSheet styleSheet) {
namedStyleMap.putAll(styleSheet.namedStyleMap);
defaultStyleMap.putAll(styleSheet.defaultStyleMap);
}
/**
* @see nextapp.echo.app.StyleSheet#getComponentTypes(java.lang.String)
*/
public Iterator getComponentTypes(String styleName) {
if (styleName == null) {
return Collections.unmodifiableSet(defaultStyleMap.keySet()).iterator();
} else {
Map styleMap = (Map) namedStyleMap.get(styleName);
return Collections.unmodifiableSet(styleMap.keySet()).iterator();
}
}
/**
* @see nextapp.echo.app.StyleSheet#getStyle(java.lang.String, java.lang.Class, boolean)
*/
public Style getStyle(String styleName, Class componentClass, boolean searchSuperClasses) {
if (styleName == null) {
// Retrieve generic style.
while (componentClass != Object.class) {
Style style = (Style) defaultStyleMap.get(componentClass);
if (!searchSuperClasses || style != null) {
return style;
}
componentClass = componentClass.getSuperclass();
}
return null;
} else {
// Retrieve named style.
Map styleMap = (Map) namedStyleMap.get(styleName);
if (styleMap == null) {
return null;
}
while (componentClass != Object.class) {
Style style = (Style) styleMap.get(componentClass);
if (!searchSuperClasses || style != null) {
return style;
}
componentClass = componentClass.getSuperclass();
}
return null;
}
}
/**
* @see nextapp.echo.app.StyleSheet#getStyleNames()
*/
public Iterator getStyleNames() {
return new Iterator() {
boolean returnDefault = defaultStyleMap.size() > 0;
Iterator namedStyleIterator = namedStyleMap.keySet().iterator();
/**
* @see java.util.Iterator#hasNext()
*/
public boolean hasNext() {
if (returnDefault) {
return true;
} else {
return namedStyleIterator.hasNext();
}
}
/**
* @see java.util.Iterator#next()
*/
public Object next() {
if (returnDefault) {
returnDefault = false;
return null;
} else {
return namedStyleIterator.next();
}
}
/**
* @see java.util.Iterator#remove()
*/
public void remove() {
throw new UnsupportedOperationException();
}
};
}
}