Simple utility class for CSS style formatting
/**
* Licensed under the Common Development and Distribution License,
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.sun.com/cddl/
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
/**
* Simple utility class for CSS style formatting
* Current version isn't thread-safe and doesn't provide any validation
*
* Usage is simle
* <code>
* CSSFormat format = new CSSFormat();
* format.add("background-position", "top left");
* format.addURL("background-image", "/images/corner.gif");
* responseWriter.writeAttribute("style", format, null);
* </code>
*
* @author Maksim Kaszynski
*
*/
public class CSSFormat {
/**
* Surrounds given URL with <code>url()</code>
* @param url
* @return
*/
public static String url(String url){
StringBuffer buf = new StringBuffer(url.length() + 7);
buf.append("url(").append(url).append(")");
return buf.toString();
}
/**
* Formats property-value pair in CSS fashion
* @param property
* @param value
* @return
*/
public static String propertyValue(String property, String value){
return formatPropertyValue(property, value);
}
private static String formatPropertyValue(Object property, Object value){
StringBuffer buf = new StringBuffer();
buf.append(property).append(": ").append(value).append(";");
return buf.toString();
}
private Map properties;
/**
* Constructs an empty CSSFormat object
*/
public CSSFormat() {
properties = new HashMap();
}
/**
* Constructs CSSFormat object
* and fills it with given parameters
* @param property
* @param value
*/
public CSSFormat(String property, String value){
properties = new HashMap(3);
add(property, value);
}
/**
* Adds property. If such property already exists,
* its value is replaced with new one
* @param property
* @param value
* @return itself
*/
public CSSFormat add(String property, String value){
properties.put(property, value);
return this;
}
/**
* adds a property with URL value
* given value is wrapped in <code>url()</code> clause
* @param property
* @param url
* @return itself
*/
public CSSFormat addURL(String property, String url){
properties.put(property, url(url));
return this;
}
/**
* Concatenates all properties with their values to produce single-line CSS output
*/
public String toString() {
return concatenate(null);
}
/**
* Concatenates all properties with their values to produce CSS output
* @param separator - custom string to be inserted between properties
* @return
*/
public String concatenate(String separator){
StringBuffer output = new StringBuffer();
for(Iterator iter = properties.entrySet().iterator(); iter.hasNext();){
Map.Entry entry = (Map.Entry) iter.next();
output.append(formatPropertyValue(entry.getKey(), entry.getValue()));
if(separator != null && iter.hasNext()){
output.append(separator);
}
}
return output.toString();
}
}
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